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Oroville Dam - Wikipedia
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1.1
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Planning
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1.2
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<span>
Construction
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1.3
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<span>
2005 dam relicensing
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1.4
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2009 river valve accident
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1.5
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2013, 2015 spillway cracks and inspection
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2
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2017 spillway failure
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2.1
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Initial spillway damage
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2.2
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Emergency spillway use and evacuation
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2.3
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Investigation and reconstruction
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2.3.1
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2020 Safety assessment
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3
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202021 drought
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4
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Operations
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4.1
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Hydroelectricity
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4.2
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Water supply
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4.3
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Flood control
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4.4
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Feather River Fish Hatchery
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5
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See also
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6
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References
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7
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Further reading
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8
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External links
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<h1 class="firstHeading mw-first-heading" id="firstHeading">
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Oroville Dam
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العربية
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<a class="interlanguage-link-target" data-language-autonym="Беларуская" data-language-local-name="Belarusian" data-title="Оравілская плаціна" href="https://be.wikipedia.org/wiki/%D0%9E%D1%80%D0%B0%D0%B2%D1%96%D0%BB%D1%81%D0%BA%D0%B0%D1%8F_%D0%BF%D0%BB%D0%B0%D1%86%D1%96%D0%BD%D0%B0" hreflang="be" lang="be" title="Оравілская плаціна Belarusian">
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Беларуская
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<span>
Català
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<a class="interlanguage-link-target" data-language-autonym="Cebuano" data-language-local-name="Cebuano" data-title="Oroville Dam" href="https://ceb.wikipedia.org/wiki/Oroville_Dam" hreflang="ceb" lang="ceb" title="Oroville Dam Cebuano">
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Cebuano
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<a class="interlanguage-link-target" data-language-autonym="Čeština" data-language-local-name="Czech" data-title="Oroville (hráz)" href="https://cs.wikipedia.org/wiki/Oroville_(hr%C3%A1z)" hreflang="cs" lang="cs" title="Oroville (hráz) Czech">
<span>
Čeština
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<a class="interlanguage-link-target" data-language-autonym="Deutsch" data-language-local-name="German" data-title="Oroville Dam" href="https://de.wikipedia.org/wiki/Oroville_Dam" hreflang="de" lang="de" title="Oroville Dam German">
<span>
Deutsch
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<a class="interlanguage-link-target" data-language-autonym="Español" data-language-local-name="Spanish" data-title="Presa de Oroville" href="https://es.wikipedia.org/wiki/Presa_de_Oroville" hreflang="es" lang="es" title="Presa de Oroville Spanish">
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Español
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<a class="interlanguage-link-target" data-language-autonym="Eesti" data-language-local-name="Estonian" data-title="Oroville'i pais" href="https://et.wikipedia.org/wiki/Oroville%27i_pais" hreflang="et" lang="et" title="Oroville'i pais Estonian">
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Eesti
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<a class="interlanguage-link-target" data-language-autonym="فارسی" data-language-local-name="Persian" data-title="سد اوروویل" href="https://fa.wikipedia.org/wiki/%D8%B3%D8%AF_%D8%A7%D9%88%D8%B1%D9%88%D9%88%DB%8C%D9%84" hreflang="fa" lang="fa" title="سد اوروویل Persian">
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فارسی
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<a class="interlanguage-link-target" data-language-autonym="Suomi" data-language-local-name="Finnish" data-title="Orovillen pato" href="https://fi.wikipedia.org/wiki/Orovillen_pato" hreflang="fi" lang="fi" title="Orovillen pato Finnish">
<span>
Suomi
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<a class="interlanguage-link-target" data-language-autonym="Français" data-language-local-name="French" data-title="Barrage d'Oroville" href="https://fr.wikipedia.org/wiki/Barrage_d%27Oroville" hreflang="fr" lang="fr" title="Barrage d'Oroville French">
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Français
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<a class="interlanguage-link-target" data-language-autonym="עברית" data-language-local-name="Hebrew" data-title="סכר אורוויל" href="https://he.wikipedia.org/wiki/%D7%A1%D7%9B%D7%A8_%D7%90%D7%95%D7%A8%D7%95%D7%95%D7%99%D7%9C" hreflang="he" lang="he" title="סכר אורוויל Hebrew">
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עברית
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<a class="interlanguage-link-target" data-language-autonym="Italiano" data-language-local-name="Italian" data-title="Diga di Oroville" href="https://it.wikipedia.org/wiki/Diga_di_Oroville" hreflang="it" lang="it" title="Diga di Oroville Italian">
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Italiano
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日本語
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<span>
Қазақша
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<a class="interlanguage-link-target" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" data-title="ഒറൊവിൽ അണക്കെട്ട്" href="https://ml.wikipedia.org/wiki/%E0%B4%92%E0%B4%B1%E0%B5%8A%E0%B4%B5%E0%B4%BF%E0%B5%BD_%E0%B4%85%E0%B4%A3%E0%B4%95%E0%B5%8D%E0%B4%95%E0%B5%86%E0%B4%9F%E0%B5%8D%E0%B4%9F%E0%B5%8D" hreflang="ml" lang="ml" title="ഒറൊവിൽ അണക്കെട്ട് Malayalam">
<span>
മലയാളം
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<a class="interlanguage-link-target" data-language-autonym="Nederlands" data-language-local-name="Dutch" data-title="Oroville Dam" href="https://nl.wikipedia.org/wiki/Oroville_Dam" hreflang="nl" lang="nl" title="Oroville Dam Dutch">
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Nederlands
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<a class="interlanguage-link-target" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" data-title="Orovilledemningen" href="https://no.wikipedia.org/wiki/Orovilledemningen" hreflang="nb" lang="nb" title="Orovilledemningen Norwegian Bokmål">
<span>
Norsk bokmål
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<a class="interlanguage-link-target" data-language-autonym="Русский" data-language-local-name="Russian" data-title="Оровиллская плотина" href="https://ru.wikipedia.org/wiki/%D0%9E%D1%80%D0%BE%D0%B2%D0%B8%D0%BB%D0%BB%D1%81%D0%BA%D0%B0%D1%8F_%D0%BF%D0%BB%D0%BE%D1%82%D0%B8%D0%BD%D0%B0" hreflang="ru" lang="ru" title="Оровиллская плотина Russian">
<span>
Русский
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<li class="interlanguage-link interwiki-sco mw-list-item">
<a class="interlanguage-link-target" data-language-autonym="Scots" data-language-local-name="Scots" data-title="Oroville Dam" href="https://sco.wikipedia.org/wiki/Oroville_Dam" hreflang="sco" lang="sco" title="Oroville Dam Scots">
<span>
Scots
</span>
</a>
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<li class="interlanguage-link interwiki-sv mw-list-item">
<a class="interlanguage-link-target" data-language-autonym="Svenska" data-language-local-name="Swedish" data-title="Orovilledammen" href="https://sv.wikipedia.org/wiki/Orovilledammen" hreflang="sv" lang="sv" title="Orovilledammen Swedish">
<span>
Svenska
</span>
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<li class="interlanguage-link interwiki-uk mw-list-item">
<a class="interlanguage-link-target" data-language-autonym="Українська" data-language-local-name="Ukrainian" data-title="Гребля Оровілл" href="https://uk.wikipedia.org/wiki/%D0%93%D1%80%D0%B5%D0%B1%D0%BB%D1%8F_%D0%9E%D1%80%D0%BE%D0%B2%D1%96%D0%BB%D0%BB" hreflang="uk" lang="uk" title="Гребля Оровілл Ukrainian">
<span>
Українська
</span>
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<a class="interlanguage-link-target" data-language-autonym="中文" data-language-local-name="Chinese" data-title="奧羅維爾水壩" href="https://zh.wikipedia.org/wiki/%E5%A5%A7%E7%BE%85%E7%B6%AD%E7%88%BE%E6%B0%B4%E5%A3%A9" hreflang="zh" lang="zh" title="奧羅維爾水壩 Chinese">
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中文
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<a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Oroville_Dam&amp;params=39_32_20_N_121_29_08_W_type:landmark">
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39°3220″N
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121°2908″W
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39.53889°N 121.48556°W
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39.53889; -121.48556
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Dam in California
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Dam in Oroville, California
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Oroville Dam
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Oroville Dam
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Oroville Dam
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Oroville Dam
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Oroville Dam (the United States)
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Country
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United States
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<th class="infobox-label" scope="row">
Location
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<a href="/wiki/Oroville,_California" title="Oroville, California">
Oroville, California
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<span class="geo-dms" title="Maps, aerial photos, and other data for this location">
<span class="latitude">
39°3220″N
</span>
<span class="longitude">
121°2908″W
</span>
</span>
</span>
<span class="geo-multi-punct">
 / 
</span>
<span class="geo-nondefault">
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39.53889°N 121.48556°W
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39.53889; -121.48556
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[
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1
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]
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</sup>
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<tr>
<th class="infobox-label" scope="row">
Purpose
</th>
<td class="infobox-data">
Water supply,
<a class="mw-redirect" href="/wiki/Flood_control" title="Flood control">
flood control
</a>
, power
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Status
</th>
<td class="infobox-data">
Operational
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Construction began
</th>
<td class="infobox-data">
1961
<span class="noprint">
; 65 years ago
</span>
<span style="display:none">
(
<span class="bday dtstart published updated">
1961
</span>
)
</span>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Opening date
</th>
<td class="infobox-data">
May 4, 1968
<span class="noprint">
;
<br/>
57 years ago
</span>
<span style="display:none">
(
<span class="bday dtstart published updated">
1968-05-04
</span>
)
</span>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Owner
</th>
<td class="infobox-data">
<a href="/wiki/California_Department_of_Water_Resources" title="California Department of Water Resources">
California Department of Water Resources
</a>
</td>
</tr>
<tr>
<th class="infobox-header" colspan="2" style="background-color:skyblue; color:inherit;">
Dam and spillways
</th>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Dam#Types" title="Dam">
Type of dam
</a>
</th>
<td class="infobox-data">
Zoned Earthfill
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Impounds
</th>
<td class="infobox-data">
<a href="/wiki/Feather_River" title="Feather River">
Feather River
</a>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Height (foundation)
</th>
<td class="infobox-data">
770 ft (235 m)
<sup class="reference" id="cite_ref-NPDP_2-0">
<a href="#cite_note-NPDP-2">
<span class="cite-bracket">
[
</span>
2
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Length
</th>
<td class="infobox-data">
6,920 ft (2,109 m)
<sup class="reference" id="cite_ref-NPDP_2-1">
<a href="#cite_note-NPDP-2">
<span class="cite-bracket">
[
</span>
2
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Dam volume
</th>
<td class="infobox-data">
77,619,000 yd
<sup>
3
</sup>
(59,344,000 m
<sup>
3
</sup>
)
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Spillway type
</th>
<td class="infobox-data">
Service, 8× gate-controlled
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Spillway capacity
</th>
<td class="infobox-data">
150,000 cu ft/s (4,200 m
<sup>
3
</sup>
/s) (service)
<sup class="reference" id="cite_ref-FERC_3-0">
<a href="#cite_note-FERC-3">
<span class="cite-bracket">
[
</span>
3
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-header" colspan="2" style="background-color:skyblue; color:inherit;">
Reservoir
</th>
</tr>
<tr>
<th class="infobox-label" scope="row">
Creates
</th>
<td class="infobox-data">
<a href="/wiki/Lake_Oroville" title="Lake Oroville">
Lake Oroville
</a>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Total capacity
</th>
<td class="infobox-data">
3,537,577 acre⋅ft (4.363537 km
<sup>
3
</sup>
)
<sup class="reference" id="cite_ref-CDEC_4-0">
<a href="#cite_note-CDEC-4">
<span class="cite-bracket">
[
</span>
4
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Inactive capacity
</th>
<td class="infobox-data">
29,600 acre⋅ft (0.0365 km
<sup>
3
</sup>
)
<sup class="reference" id="cite_ref-5">
<a href="#cite_note-5">
<span class="cite-bracket">
[
</span>
5
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Drainage_basin" title="Drainage basin">
Catchment area
</a>
</th>
<td class="infobox-data">
3,607 mi
<sup>
2
</sup>
(9,340 km
<sup>
2
</sup>
)
<sup class="reference" id="cite_ref-CDEC_4-1">
<a href="#cite_note-CDEC-4">
<span class="cite-bracket">
[
</span>
4
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Surface area
</th>
<td class="infobox-data">
15,805 acres (6,396 ha)
<sup class="reference" id="cite_ref-CDEC_4-2">
<a href="#cite_note-CDEC-4">
<span class="cite-bracket">
[
</span>
4
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
Normal elevation
</th>
<td class="infobox-data">
901 ft (275 m) (spillway crest)
<sup class="reference" id="cite_ref-FERC_3-1">
<a href="#cite_note-FERC-3">
<span class="cite-bracket">
[
</span>
3
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-header" colspan="2" style="background-color:skyblue; color:inherit;">
Power Station
</th>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Hydraulic_head" title="Hydraulic head">
Hydraulic head
</a>
</th>
<td class="infobox-data">
615 ft (187 m)
<sup class="reference" id="cite_ref-power_6-0">
<a href="#cite_note-power-6">
<span class="cite-bracket">
[
</span>
6
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Water_turbine" title="Water turbine">
Turbines
</a>
</th>
<td class="infobox-data">
<style data-mw-deduplicate="TemplateStyles:r1126788409">
.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}
</style>
<div class="plainlist">
<ul>
<li>
3 ×
<span class="nowrap">
132 MW
</span>
conventional
</li>
<li>
3 ×
<span class="nowrap">
141 MW
</span>
<a href="/wiki/Pumped-storage_hydroelectricity" title="Pumped-storage hydroelectricity">
pump-generators
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Nameplate_capacity" title="Nameplate capacity">
Installed capacity
</a>
</th>
<td class="infobox-data">
819
<a class="mw-redirect" href="/wiki/Megawatt" title="Megawatt">
MW
</a>
<sup class="reference" id="cite_ref-power_6-1">
<a href="#cite_note-power-6">
<span class="cite-bracket">
[
</span>
6
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a href="/wiki/Capacity_factor" title="Capacity factor">
Capacity factor
</a>
</th>
<td class="infobox-data">
21%
</td>
</tr>
<tr>
<th class="infobox-label" scope="row">
<a class="mw-redirect" href="/wiki/Net_generation" title="Net generation">
Annual generation
</a>
</th>
<td class="infobox-data">
1,629
<a class="mw-redirect" href="/wiki/Kilowatt_hour#Watt_hour_multiples_and_billing_units" title="Kilowatt hour">
GWh
</a>
(20012012)
<sup class="reference" id="cite_ref-7">
<a href="#cite_note-7">
<span class="cite-bracket">
[
</span>
7
<span class="cite-bracket">
]
</span>
</a>
</sup>
</td>
</tr>
<tr>
<td class="infobox-full-data" colspan="2">
<b>
Website
</b>
<br/>
<span class="plainlinks">
<span class="url">
<a class="external text" href="https://water.ca.gov/Programs/State-Water-Project/SWP-Facilities/Oroville" rel="nofollow">
water
<wbr/>
.ca
<wbr/>
.gov
<wbr/>
/Programs
<wbr/>
/State-Water-Project
<wbr/>
/SWP-Facilities
<wbr/>
/Oroville
</a>
</span>
</span>
</td>
</tr>
</tbody>
</table>
<p>
<b>
Oroville Dam
</b>
is an earthfill
<a href="/wiki/Embankment_dam" title="Embankment dam">
embankment dam
</a>
on the
<a href="/wiki/Feather_River" title="Feather River">
Feather River
</a>
east of the city of
<a href="/wiki/Oroville,_California" title="Oroville, California">
Oroville, California
</a>
, in the
<a class="mw-redirect" href="/wiki/Sierra_Nevada_(U.S.)" title="Sierra Nevada (U.S.)">
Sierra Nevada
</a>
foothills east of the
<a href="/wiki/Sacramento_Valley" title="Sacramento Valley">
Sacramento Valley
</a>
. At 770 feet (235 m) high, it is the tallest dam in the U.S.
<sup class="reference" id="cite_ref-8">
<a href="#cite_note-8">
<span class="cite-bracket">
[
</span>
8
<span class="cite-bracket">
]
</span>
</a>
</sup>
and serves mainly for water supply,
<a href="/wiki/Hydroelectricity" title="Hydroelectricity">
hydroelectricity
</a>
generation, and flood control. The dam impounds
<a href="/wiki/Lake_Oroville" title="Lake Oroville">
Lake Oroville
</a>
, the second-largest
<a href="/wiki/Reservoir" title="Reservoir">
reservoir
</a>
in California, capable of storing more than 3.5 million acre-feet (1.1
<span style="margin-left:0.2em">
×
<span style="margin-left:0.1em">
10
</span>
</span>
<s style="display:none">
^
</s>
<sup>
12
</sup>
US gal; 4.3
<span style="margin:0 .15em 0 .25em">
×
</span>
10
<sup>
9
</sup>
m
<sup>
3
</sup>
).
<sup class="reference" id="cite_ref-Over_40000!_9-0">
<a href="#cite_note-Over_40000!-9">
<span class="cite-bracket">
[
</span>
9
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
Built by the
<a href="/wiki/California_Department_of_Water_Resources" title="California Department of Water Resources">
California Department of Water Resources
</a>
, Oroville Dam is one of the key features of the
<a href="/wiki/California_State_Water_Project" title="California State Water Project">
California State Water Project
</a>
(SWP), one of two major projects passed that set up California's
<a href="/wiki/Water_in_California" title="Water in California">
statewide water system
</a>
. Construction was initiated in 1961, and despite numerous difficulties encountered during its construction, including multiple floods and a major train wreck on the rail line used to transport materials to the dam site, the embankment was topped out in 1967 and the entire project was ready for use in 1968. The dam began to generate electricity shortly afterwards with completion of the
<a class="mw-redirect" href="/wiki/Edward_Hyatt_Power_Plant" title="Edward Hyatt Power Plant">
Edward Hyatt Power Plant
</a>
, then the country's largest
<a href="/wiki/Underground_power_station" title="Underground power station">
underground power station
</a>
.
</p>
<p>
Since its completion in 1968, the Oroville Dam has allocated the flow of the Feather River from the
<a href="/wiki/Sacramento%E2%80%93San_Joaquin_River_Delta" title="SacramentoSan Joaquin River Delta">
Sacramento-San Joaquin Delta
</a>
into the SWP's
<a href="/wiki/California_Aqueduct" title="California Aqueduct">
California Aqueduct
</a>
, which provides a major supply of water for irrigation in the
<a href="/wiki/San_Joaquin_Valley" title="San Joaquin Valley">
San Joaquin Valley
</a>
, as well as municipal and industrial water supplies to coastal
<a href="/wiki/Southern_California" title="Southern California">
Southern California
</a>
, and has prevented large amounts of flood damage to the area—more than $1.3 billion between 1987 and 1999.
<sup class="reference" id="cite_ref-10">
<a href="#cite_note-10">
<span class="cite-bracket">
[
</span>
10
<span class="cite-bracket">
]
</span>
</a>
</sup>
The dam stops fish migration up the Feather River and the controlled flow of the river; as a result, the Oroville Dam has affected
<a href="/wiki/Riparian_zone" title="Riparian zone">
riparian
</a>
habitat. Multiple attempts at trying to counter the dam's impacts on
<a href="/wiki/Fish_migration" title="Fish migration">
fish migration
</a>
have included the construction of a
<a href="/wiki/Salmon" title="Salmon">
salmon
</a>
/
<a href="/wiki/Rainbow_trout" title="Rainbow trout">
steelhead
</a>
<a href="/wiki/Fish_hatchery" title="Fish hatchery">
fish hatchery
</a>
on the river, which began shortly after the dam was completed.
</p>
<p>
In February 2017,
<a href="/wiki/Oroville_Dam_crisis" title="Oroville Dam crisis">
the main and emergency spillways threatened to fail
</a>
, leading to the evacuation of 188,000 people living near the dam.
<sup class="reference" id="cite_ref-SacBeeEvac_11-0">
<a href="#cite_note-SacBeeEvac-11">
<span class="cite-bracket">
[
</span>
11
<span class="cite-bracket">
]
</span>
</a>
</sup>
After deterioration of the main spillway largely stabilized
<sup class="reference" id="cite_ref-12">
<a href="#cite_note-12">
<span class="cite-bracket">
[
</span>
12
<span class="cite-bracket">
]
</span>
</a>
</sup>
and the water level of the dam's reservoir dropped below the top of the emergency spillway, the evacuation order was lifted.
<sup class="reference" id="cite_ref-LiftOrdersCNBC_13-0">
<a href="#cite_note-LiftOrdersCNBC-13">
<span class="cite-bracket">
[
</span>
13
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
The main spillway was reconstructed by November 1, 2018, and water releases were successfully tested, up to 25,000 cu ft/s (710 m
<sup>
3
</sup>
/s), during April 2019.
</p>
<meta property="mw:PageProp/toc">
<div class="mw-heading mw-heading2">
<h2 id="History">
History
</h2>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
[
</span>
<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=1" title="Edit section: History">
<span>
edit
</span>
</a>
<span class="mw-editsection-bracket">
]
</span>
</span>
</div>
<div class="mw-heading mw-heading3">
<h3 id="Planning">
Planning
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
[
</span>
<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=2" title="Edit section: Planning">
<span>
edit
</span>
</a>
<span class="mw-editsection-bracket">
]
</span>
</span>
</div>
<p>
In 1935, work began on the
<a href="/wiki/Central_Valley_Project" title="Central Valley Project">
Central Valley Project
</a>
, a federal water project that would develop the Sacramento and
<a href="/wiki/San_Joaquin_River" title="San Joaquin River">
San Joaquin River
</a>
systems for irrigation of the highly fertile
<a href="/wiki/Central_Valley_(California)" title="Central Valley (California)">
Central Valley
</a>
. However, after the end of
<a href="/wiki/World_War_II" title="World War II">
World War II
</a>
in 1945, the state experienced an economic boom that led to rapid urban and commercial growth in the central and southern portions of the state, and it became clear that California's economy could not depend solely on a state water system geared primarily towards agriculture. A new study of California's water supplies by the Division of Water Resources (now
<a href="/wiki/California_Department_of_Water_Resources" title="California Department of Water Resources">
California Department of Water Resources
</a>
, DWR) was carried out under an act of the
<a href="/wiki/California_State_Legislature" title="California State Legislature">
California State Legislature
</a>
in 1945.
<sup class="reference" id="cite_ref-SWP_14-0">
<a href="#cite_note-SWP-14">
<span class="cite-bracket">
[
</span>
14
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
In 1951, California State Engineer A. D. Edmonston proposed the Feather River Project, the direct predecessor to the SWP, which included a major dam on the Feather River at Oroville, and aqueducts and pumping plants to transfer stored water to destinations in central and southern California. The proposed project was strongly opposed by voters in Northern California and parts of Southern California that received water from the
<a href="/wiki/Colorado_River" title="Colorado River">
Colorado River
</a>
, but was supported by other Southern Californians and San Joaquin Valley farmers. However, major flooding in the 1950s prompted the 1957 passage of an emergency flood-control bill that provided sufficient funding for construction for a dam at Oroville regardless of whether it would become part of the SWP.
<sup class="reference" id="cite_ref-SWP_14-1">
<a href="#cite_note-SWP-14">
<span class="cite-bracket">
[
</span>
14
<span class="cite-bracket">
]
</span>
</a>
</sup>
<sup class="reference" id="cite_ref-Keats_15-0">
<a href="#cite_note-Keats-15">
<span class="cite-bracket">
[
</span>
15
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<div class="mw-heading mw-heading3">
<h3 id="Construction">
Construction
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
[
</span>
<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=3" title="Edit section: Construction">
<span>
edit
</span>
</a>
<span class="mw-editsection-bracket">
]
</span>
</span>
</div>
<p>
Groundbreaking on the dam site occurred in May 1957 with the relocation of the
<a href="/wiki/Western_Pacific_Railroad" title="Western Pacific Railroad">
Western Pacific Railroad
</a>
tracks that ran through the Feather River Canyon. The Burns-Porter Act of the California Legislature, which authorized the SWP, was not passed until November 8, 1960, and only by a slim margin.
<sup class="reference" id="cite_ref-SWP_14-2">
<a href="#cite_note-SWP-14">
<span class="cite-bracket">
[
</span>
14
<span class="cite-bracket">
]
</span>
</a>
</sup>
<sup class="reference" id="cite_ref-Keats_15-1">
<a href="#cite_note-Keats-15">
<span class="cite-bracket">
[
</span>
15
<span class="cite-bracket">
]
</span>
</a>
</sup>
Engineer Donald Thayer of the DWR was commissioned to design and head construction of Oroville Dam, and the primary work contract was awarded to Oro Dam Constructors Inc., a joint venture led by Oman Construction Co.
<sup class="reference" id="cite_ref-16">
<a href="#cite_note-16">
<span class="cite-bracket">
[
</span>
16
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
Two concrete-lined diversion tunnels, each 4,400 ft (1,341 m) long and 35 ft (11 m) in diameter, were excavated to channel the Feather River around the dam site. One of the tunnels was located at river level and was to carry normal water flows, while the second one was only to be used during floods.
<sup class="reference" id="cite_ref-17">
<a href="#cite_note-17">
<span class="cite-bracket">
[
</span>
17
<span class="cite-bracket">
]
</span>
</a>
</sup>
In May 1963, workers poured the last of 252,000 yd
<sup>
3
</sup>
(6.8 million cu ft; 193,000 m
<sup>
3
</sup>
) of concrete that comprised the 128 ft (39 m) high
<a href="/wiki/Cofferdam" title="Cofferdam">
cofferdam
</a>
, to protect the construction site from floods. This structure later served as an impervious core for the completed dam. With the cofferdam in place, an 11-mile (18 km) rail line was constructed to move earth and rock to the dam site. An average of 120 train cars ran along the line each hour, transporting fill that was mainly excavated from enormous piles of
<a href="/wiki/Hydraulic_mining" title="Hydraulic mining">
hydraulic mining
</a>
debris that was washed down by the Feather River after the
<a class="mw-redirect" href="/wiki/California_Gold_Rush" title="California Gold Rush">
California Gold Rush
</a>
.
<sup class="reference" id="cite_ref-PM1985_18-0">
<a href="#cite_note-PM1985-18">
<span class="cite-bracket">
[
</span>
18
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
On December 22, 1964, disaster nearly struck when the Feather River, after days of heavy rain, reached a peak flow of 250,000 cu ft/s (7,100 m
<sup>
3
</sup>
/s) above the Oroville Dam site. The water rose behind the partially completed embankment dam and nearly overtopped it, while a maximum of 157,000 cu ft/s (4,400 m
<sup>
3
</sup>
/s) poured from the diversion tunnels. This
<a href="/wiki/Christmas_flood_of_1964" title="Christmas flood of 1964">
Christmas flood of 1964
</a>
was one of the most disastrous floods on record in Northern California, but the incomplete dam was able to reduce the peak flow of the Feather River by nearly 40%, averting massive damage to the area.
<sup class="reference" id="cite_ref-19">
<a href="#cite_note-19">
<span class="cite-bracket">
[
</span>
19
<span class="cite-bracket">
]
</span>
</a>
</sup>
<sup class="reference" id="cite_ref-20">
<a href="#cite_note-20">
<span class="cite-bracket">
[
</span>
20
<span class="cite-bracket">
]
</span>
</a>
</sup>
</p>
<p>
Ten months later, four men died in a tragic accident on the construction rail line. On October 7, 1965, two 40-car work trains, one fully loaded and the other empty, collided head-on at a tunnel entrance, igniting 10,000 US gallons (38,000 L) of diesel fuel, completely destroying two locomotives. The burning fuel from the collision started a forest fire that burned 100 acres (40 ha) before it could be extinguished. The crash delayed construction of the dam by a week while the train wreckage was cleared.
<sup class="reference" id="cite_ref-21">
<a href="#cite_note-21">
<span class="cite-bracket">
[
</span>
21
<span class="cite-bracket">
]
</span>
</a>
</sup>
<sup class="reference" id="cite_ref-train_22-0">
<a href="#cite_note-train-22">
<span class="cite-bracket">
[
</span>
22
<span class="cite-bracket">
]
</span>
</a>
</sup>
Overall, 34 men died in the construction of the dam.
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<p>
Oroville Dam was designed to withstand the strongest possible earthquake for the region, and was fitted with hundreds of instruments that serve to measure water pressure and settlement of the earth fill used in its construction, earning it the nickname "the dam that talks back".
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(A
<a class="mw-redirect" href="/wiki/Local_magnitude_scale" title="Local magnitude scale">
M
<sub>
L
</sub>
</a>
5.7 earthquake in the Oroville area in 1975 is believed to have been caused by
<a href="/wiki/Induced_seismicity" title="Induced seismicity">
induced seismicity
</a>
from the weight of the Oroville Dam and reservoir on a local fault line.
<sup class="reference" id="cite_ref-24">
<a href="#cite_note-24">
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</sup>
) The embankment was finally topped out on October 6, 1967, with the last of 155 million
<a href="/wiki/Short_ton" title="Short ton">
short tons
</a>
(140.6 million
<a href="/wiki/Tonne" title="Tonne">
tonnes
</a>
) of material that took over 40,000 train trips to transport.
<sup class="reference" id="cite_ref-PM1985_18-1">
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On May 4, 1968, Oroville Dam was officially dedicated by the state of California.
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</sup>
Among the notable figures present were California governor
<a href="/wiki/Ronald_Reagan" title="Ronald Reagan">
Ronald Reagan
</a>
, who spoke,
<sup class="reference" id="cite_ref-26">
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</sup>
<a href="/wiki/Chief_Justice_of_the_United_States" title="Chief Justice of the United States">
Chief Justice
</a>
(formerly California governor)
<a href="/wiki/Earl_Warren" title="Earl Warren">
Earl Warren
</a>
, Senator
<a href="/wiki/Thomas_Kuchel" title="Thomas Kuchel">
Thomas Kuchel
</a>
, and California Representative
<a class="mw-redirect" href="/wiki/Harold_T._Johnson" title="Harold T. Johnson">
Harold T. "Bizz" Johnson
</a>
.
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The dedication was accompanied by a week of festivities in nearby Oroville, attended by nearly 50,000 people.
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</p>
<div class="mw-heading mw-heading3">
<h3 id="2005_dam_relicensing">
2005 dam relicensing
</h3>
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<p>
On October 17, 2005, three environmental groups filed a motion with the
<a href="/wiki/Federal_Energy_Regulatory_Commission" title="Federal Energy Regulatory Commission">
Federal Energy Regulatory Commission
</a>
(FERC) urging federal officials to require that the dam's emergency spillway be armored with concrete, rather than remain as an earthen spillway, as it did not meet modern safety standards. "In the event of extreme rain and flooding, fast-rising water would overwhelm the main concrete spillway, then flow down the emergency spillway, and that could cause heavy erosion that would create flooding for communities downstream, but also could cause a failure, known as 'loss of crest control'." FERC water agencies responsible for the cost of the upgrades said this was unnecessary and that concerns were overblown.
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<p>
In 2006, a senior civil engineer sent a memorandum to his managers stating, "The emergency spillway meets FERC's engineering guidelines for an emergency spillway", and "The guidelines specify that during a rare flood event, it is acceptable for the emergency spillway to sustain significant damage."
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<div class="mw-heading mw-heading3">
<h3 id="2009_river_valve_accident">
2009 river valve accident
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
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<p>
At around 7:30
<span class="nowrap">
</span>
am on July 22, 2009, several workers were deep below the reservoir operating flow controls to test a river valve chamber in the Oroville Dam. When the flow reached 85%, suction pulled a breakaway wall downstream into a 35-foot (11 m) diversion tunnel, cutting lights and nearly sending three workers to their deaths in the roaring current.
</p>
<p>
One of the workers who was badly injured survived by clinging to a bent rail, where he was struck by tools and equipment being sucked into the tunnel. He was hospitalized for four days with head trauma, a broken leg and arm, cuts, and bruises.
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<p>
The
<a class="new" href="/w/index.php?title=California_Division_of_the_Occupational_Health_and_Safety_Administration&amp;action=edit&amp;redlink=1" title="California Division of the Occupational Health and Safety Administration (page does not exist)">
California Division of the Occupational Health and Safety Administration
</a>
(Cal OSHA) concluded opening the valves without an energy-dispersion ring, which reportedly was absent, "created water flow with such great turbulence that it blocked an air vent and created a vacuum".
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It sanctioned the DWR with six citations, including five classified as serious, and the department was initially fined $141,375. Two of the "serious" citations were overturned on appeal.
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<p>
This river valve system was one of the first parts of the dam to be built when the dam project started in 1961, because its initial purpose was to divert the river while the dam was under construction. After that, it served various purposes, including as a possible emergency release valve.
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Since the accident, DWR had implemented a standing order that prohibited the operation of the river outlet system and significantly limited access to the river valve chamber.
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Following the accident, DWR entered into a 2012 agreement with Cal OSHA to hire a third-party expert to improve the safety of the river valve outlet system (RVOS) and make it operational again. In 2014, DWR embarked on an accelerated refurbishment program to respond to concerns about operational needs during the ongoing drought. The system was mostly refurbished and was used during 2014 and 2015 to meet
<a class="mw-redirect" href="/wiki/Endangered_Species_Act" title="Endangered Species Act">
Endangered Species Act
</a>
temperature requirements for the Feather River. Some additional refurbishments were being made to portions of the RVOS and were expected to conclude in early 2017.
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</p>
<div class="mw-heading mw-heading3">
<h3 id="2013,_2015_spillway_cracks_and_inspection">
<span id="2013.2C_2015_spillway_cracks_and_inspection">
</span>
2013, 2015 spillway cracks and inspection
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
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<p>
The spillway cracked in 2013. A senior civil engineer with the DWR was interviewed by the
<i>
Sacramento Bee
</i>
, and explained, "Its common for spillways to develop a void because of the drainage systems under them", and "There were some patches needed and so we made repairs and everything checked out."
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In July 2015, the state Division of Safety of Dams inspected the dam spillway visually "from some distance" and did not walk it.
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<div class="mw-heading mw-heading2">
<h2 id="2017_spillway_failure">
2017 spillway failure
</h2>
<span class="mw-editsection">
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Main article:
<a href="/wiki/Oroville_Dam_crisis" title="Oroville Dam crisis">
Oroville Dam crisis
</a>
</div>
<figure class="mw-default-size" typeof="mw:File/Thumb">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam_spillway_damage_27_Feb_2017.jpg">
<img class="mw-file-element" data-file-height="1303" data-file-width="2100" decoding="async" height="155" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Oroville_Dam_spillway_damage_27_Feb_2017.jpg/250px-Oroville_Dam_spillway_damage_27_Feb_2017.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Oroville_Dam_spillway_damage_27_Feb_2017.jpg/500px-Oroville_Dam_spillway_damage_27_Feb_2017.jpg 1.5x" width="250"/>
</a>
<figcaption>
Oroville Dam spillway damage, February 27, 2017
</figcaption>
</figure>
<div class="mw-heading mw-heading3">
<h3 id="Initial_spillway_damage">
Initial spillway damage
</h3>
<span class="mw-editsection">
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<p>
The rainy season of 20162017 was
<a href="/wiki/2017_California_floods" title="2017 California floods">
Northern California's wettest winter in over 100 years
</a>
. Heavy rainfall resulted in record inflows from the Feather River, and the spillway was opened in January to relieve pressure on Oroville Dam. After a second series of heavy storms in February, the spillway flow was increased to 50,000 cu ft/s (1,400 m
<sup>
3
</sup>
/s), and on February 7, DWR employees noticed an unusual flow pattern. This halted spillway outflow, and DWR brought engineers onto the spillway to inspect its integrity. The engineers found a large area of concrete and foundation erosion. This erosion feature was too massive to repair without diverting water to the emergency spillway, and halted outflow along the main spillway for a period to fix the hole.
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High inflows to Lake Oroville forced dam operators to continue using the damaged spillway, causing additional damage. The spillway hole continued to grow.
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</sup>
Debris from the crater in the main spillway was carried downstream, and caused damage to the
<a href="#Feather_River_Fish_Hatchery">
Feather River Fish Hatchery
</a>
due to high
<a href="/wiki/Turbidity" title="Turbidity">
turbidity
</a>
.
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<p>
Although engineers had hoped that using the damaged spillway could drain the lake enough to avoid use of the emergency spillway,
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</sup>
they were forced to reduce its discharge from 65,000 cu ft/s (1,800 m
<sup>
3
</sup>
/s) to 55,000 cu ft/s (1,600 m
<sup>
3
</sup>
/s) due to potential damage to nearby power lines.
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</p>
<div class="mw-heading mw-heading3">
<h3 id="Emergency_spillway_use_and_evacuation">
Emergency spillway use and evacuation
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
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<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_dam_spillover_2017-02-11.jpg">
<img class="mw-file-element" data-file-height="720" data-file-width="960" decoding="async" height="140" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Oroville_dam_spillover_2017-02-11.jpg/250px-Oroville_dam_spillover_2017-02-11.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Oroville_dam_spillover_2017-02-11.jpg/330px-Oroville_dam_spillover_2017-02-11.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Oroville_dam_spillover_2017-02-11.jpg/500px-Oroville_dam_spillover_2017-02-11.jpg 2x" width="187"/>
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<div class="thumbcaption">
Water overflowed the parking lot past the emergency spillway (in the background), while water continued to flow through the main spillway (in the foreground), on February 11.
</div>
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<div class="tsingle" style="width:211px;max-width:211px">
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<div class="thumbcaption">
Water from the Oroville Dam flows over the emergency spillway on Sunday, February 12
</div>
</div>
</div>
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</div>
<p>
Shortly after 8:00 pm on February 11, 2017, the emergency spillway began carrying water for the first time since the dam's construction in 1968.
<sup class="reference" id="cite_ref-45">
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The water flowed directly onto the earthen hillside below the emergency spillway, as designed. However,
<a href="/wiki/Headward_erosion" title="Headward erosion">
headward erosion
</a>
of the emergency spillway threatened to undermine and collapse the concrete
<a href="/wiki/Weir" title="Weir">
weir
</a>
.
</p>
<p>
On February 12, an evacuation was ordered for low-lying areas, due to possible failure of the emergency spillway.
<sup class="reference" id="cite_ref-46">
<a href="#cite_note-46">
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</sup>
The flow over the main spillway was increased to 100,000 cu ft/s (2,800 m
<sup>
3
</sup>
/s) to try to slow erosion of the emergency spillway.
<sup class="reference" id="cite_ref-47">
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<p>
By 8:00 pm on the evening of February 12, the increased flow had lowered the water level, causing the emergency spillway to stop overflowing. On February 14, the sheriff of Butte County lifted the mandatory evacuation order.
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<a href="#cite_note-LiftOrdersCNBC-13">
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<div class="mw-heading mw-heading3">
<h3 id="Investigation_and_reconstruction">
Investigation and reconstruction
</h3>
<span class="mw-editsection">
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<p>
On May 19, 2017, the spillway was shut down for the summer, to allow demolition and repair work to begin.
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The total cost of the repair was projected to exceed $400 million, with the $275 million primary contract awarded to
<a href="/wiki/Kiewit_Corporation" title="Kiewit Corporation">
Kiewit Construction
</a>
.
<sup class="reference" id="cite_ref-49">
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[
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<a href="/wiki/Federal_Emergency_Management_Agency" title="Federal Emergency Management Agency">
FEMA
</a>
was expected to cover a large portion of the expenses.
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<p>
According to an independent forensics team led by John France, the exact cause of the spillway failure remains uncertain, though they identified "24 possible causes for the spillway failure, including a faulty drainage system, variations in concrete thickness, and corrosion in the structure's rebar".
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For 2018 the DWR planned to demolish and reconstruct the portion of the spillway which was undamaged by the flood, but which also has been identified as structurally defective. In addition, crews worked to extend a cutoff wall under the emergency spillway to prevent erosion should that structure be used again in the future.
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<p>
On November 1, 2017, DWR director Grant Davis said, "Lake Oroville's main spillway is indeed ready to safely handle winter flows if needed".
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While this completes phase 1 of the construction, there remained a phase 2 to be completed in 2018. The second phase would include rebuilding the top section of the spillway (which was not rebuilt this season), putting slabs over the roller compacted concrete section, and constructing a concrete
<a class="mw-redirect" href="/wiki/Deep_foundation#Secant_piled_walls" title="Deep foundation">
secant cutoff wall
</a>
for the emergency spillway.
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The cost estimate at this point is over $500 million.
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In October 2017, hairline cracks were found in the rebuilt spillway.
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Things that added to the cost included relocating power lines, dredging the river downstream of the dam, as well as the discovery that the bedrock under the spillway was weak, necessitating deeper excavations and more concrete.
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The DWR commissioned an independent board of consultants (BOC) to review and comment on repairs to Oroville Dam.
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Memoranda (reports) prepared by the BOC are posted at the DWR web site.
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The independent forensic team (IFT) was selected to determine the cause of the spillways incident, including effects of operations, management, structural design and geological conditions.
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<th class="cot-header-mainspace" style="; font-size:87%; padding:0.2em 0.3em; text-align:center;">
<div style="font-size:115%;margin:0 4em">
Progression of spillway conditions,
<a href="/wiki/Sentinel-2" title="Sentinel-2">
Sentinel-2
</a>
true-color satellite images
</div>
</th>
</tr>
<tr>
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<div>
<ul class="nochecker bordered-images whitebg gallery mw-gallery-traditional">
<li class="gallerybox" style="width: 435px">
<div class="thumb" style="width: 430px; height: 230px;">
<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam,_California,_January_30,_2017,_Sentinel-6,_true-color_satellite_image.tif" title="January 30, 2017, before spillways failed">
<img alt="January 30, 2017, before spillways failed" class="mw-file-element" data-file-height="1023" data-file-width="1916" decoding="async" height="200" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Oroville_Dam%2C_California%2C_January_30%2C_2017%2C_Sentinel-6%2C_true-color_satellite_image.tif/lossless-page1-500px-Oroville_Dam%2C_California%2C_January_30%2C_2017%2C_Sentinel-6%2C_true-color_satellite_image.tif.png" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Oroville_Dam%2C_California%2C_January_30%2C_2017%2C_Sentinel-6%2C_true-color_satellite_image.tif/lossless-page1-960px-Oroville_Dam%2C_California%2C_January_30%2C_2017%2C_Sentinel-6%2C_true-color_satellite_image.tif.png 1.5x" width="375"/>
</a>
</span>
</div>
<div class="gallerytext">
January 30, 2017, before spillways failed
</div>
</li>
<li class="gallerybox" style="width: 435px">
<div class="thumb" style="width: 430px; height: 230px;">
<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam,_California,_March_11,_2017,_Sentinel-5,_true-color_satellite_image.tif" title="March 11, 2017, after spillways failed">
<img alt="March 11, 2017, after spillways failed" class="mw-file-element" data-file-height="1023" data-file-width="1916" decoding="async" height="200" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Oroville_Dam%2C_California%2C_March_11%2C_2017%2C_Sentinel-5%2C_true-color_satellite_image.tif/lossless-page1-500px-Oroville_Dam%2C_California%2C_March_11%2C_2017%2C_Sentinel-5%2C_true-color_satellite_image.tif.png" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Oroville_Dam%2C_California%2C_March_11%2C_2017%2C_Sentinel-5%2C_true-color_satellite_image.tif/lossless-page1-960px-Oroville_Dam%2C_California%2C_March_11%2C_2017%2C_Sentinel-5%2C_true-color_satellite_image.tif.png 1.5x" width="375"/>
</a>
</span>
</div>
<div class="gallerytext">
March 11, 2017, after spillways failed
</div>
</li>
<li class="gallerybox" style="width: 435px">
<div class="thumb" style="width: 430px; height: 230px;">
<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam,_California,_July_29,_2017,_Sentinel-4,_true-color_satellite_image.tif" title="July 29, 2017, construction progress">
<img alt="July 29, 2017, construction progress" class="mw-file-element" data-file-height="1023" data-file-width="1916" decoding="async" height="200" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Oroville_Dam%2C_California%2C_July_29%2C_2017%2C_Sentinel-4%2C_true-color_satellite_image.tif/lossless-page1-500px-Oroville_Dam%2C_California%2C_July_29%2C_2017%2C_Sentinel-4%2C_true-color_satellite_image.tif.png" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Oroville_Dam%2C_California%2C_July_29%2C_2017%2C_Sentinel-4%2C_true-color_satellite_image.tif/lossless-page1-960px-Oroville_Dam%2C_California%2C_July_29%2C_2017%2C_Sentinel-4%2C_true-color_satellite_image.tif.png 1.5x" width="375"/>
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July 29, 2017, construction progress
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<li class="gallerybox" style="width: 435px">
<div class="thumb" style="width: 430px; height: 230px;">
<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam,_California,_November_6,_2017,_Sentinel-3,_true-color_satellite_image.tif" title="November 6, 2017, construction progress">
<img alt="November 6, 2017, construction progress" class="mw-file-element" data-file-height="1023" data-file-width="1916" decoding="async" height="200" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/16/Oroville_Dam%2C_California%2C_November_6%2C_2017%2C_Sentinel-3%2C_true-color_satellite_image.tif/lossless-page1-500px-Oroville_Dam%2C_California%2C_November_6%2C_2017%2C_Sentinel-3%2C_true-color_satellite_image.tif.png" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/16/Oroville_Dam%2C_California%2C_November_6%2C_2017%2C_Sentinel-3%2C_true-color_satellite_image.tif/lossless-page1-960px-Oroville_Dam%2C_California%2C_November_6%2C_2017%2C_Sentinel-3%2C_true-color_satellite_image.tif.png 1.5x" width="375"/>
</a>
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<div class="gallerytext">
November 6, 2017, construction progress
</div>
</li>
<li class="gallerybox" style="width: 435px">
<div class="thumb" style="width: 430px; height: 230px;">
<span typeof="mw:File">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam,_California,_January_30,_2018,_Sentinel-2,_true-color_satellite_image.tif" title="January 30, 2018, construction progress">
<img alt="January 30, 2018, construction progress" class="mw-file-element" data-file-height="1023" data-file-width="1916" decoding="async" height="200" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Oroville_Dam%2C_California%2C_January_30%2C_2018%2C_Sentinel-2%2C_true-color_satellite_image.tif/lossless-page1-500px-Oroville_Dam%2C_California%2C_January_30%2C_2018%2C_Sentinel-2%2C_true-color_satellite_image.tif.png" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Oroville_Dam%2C_California%2C_January_30%2C_2018%2C_Sentinel-2%2C_true-color_satellite_image.tif/lossless-page1-960px-Oroville_Dam%2C_California%2C_January_30%2C_2018%2C_Sentinel-2%2C_true-color_satellite_image.tif.png 1.5x" width="375"/>
</a>
</span>
</div>
<div class="gallerytext">
January 30, 2018, construction progress
</div>
</li>
</ul>
</div>
</div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<figure class="mw-default-size" typeof="mw:File/Thumb">
<a class="mw-file-description" href="/wiki/File:Oroville_Dam_main_spillway_rebuild_phase_2.jpg">
<img class="mw-file-element" data-file-height="841" data-file-width="1334" decoding="async" height="158" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Oroville_Dam_main_spillway_rebuild_phase_2.jpg/250px-Oroville_Dam_main_spillway_rebuild_phase_2.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Oroville_Dam_main_spillway_rebuild_phase_2.jpg/500px-Oroville_Dam_main_spillway_rebuild_phase_2.jpg 1.5x" width="250"/>
</a>
<figcaption>
The Oroville Dam main spillway on August 5, 2018, during phase-two repairs
</figcaption>
</figure>
<p>
According to its 201718 operations plan, the DWR maintained Lake Oroville at a lower-than-normal level to reduce the possibility that the spillway would have to be used the following winter.
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In a second phase of spillway repairs in 201819, temporary repairs on the main spillway done during phase one were being torn out and replaced with steel-reinforced structural concrete.
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On April 2, 2019, due to heavy rainfall upstream, the DWR began releasing water over the newly reconstructed spillway at a rate of 8,300 cubic feet per second (240 m
<sup>
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/s).
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Releases were increased to 25,000 cubic feet per second (710 m
<sup>
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</sup>
/s) on April 7 to test how the spillway performed in higher flows. They were decreased to 15,000 cubic feet per second (420 m
<sup>
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</sup>
/s) on April 9.
</p>
<div class="mw-heading mw-heading4">
<h4 id="2020_Safety_assessment">
2020 Safety assessment
</h4>
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<p>
The DWR released an assessment, dated October 1, 2020, concluding that Oroville Dam was suitable for continued safe and reliable operation.
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<p>
Meanwhile, the
<a href="/wiki/Federal_Energy_Regulatory_Commission" title="Federal Energy Regulatory Commission">
Federal Energy Regulatory Commission
</a>
has demanded that California submit a plan by September 2022, for addressing the issue of greater amounts of rain predicted in the future.
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<div class="mw-heading mw-heading2">
<h2 id="202021_drought">
<span id="2020.E2.80.9321_drought">
</span>
202021 drought
</h2>
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<figure class="mw-default-size" typeof="mw:File/Thumb">
<a class="mw-file-description" href="/wiki/File:Edward_Hyatt_Powerplant_during_its_shutdown_in_August_2021-5993.jpg">
<img class="mw-file-element" data-file-height="4246" data-file-width="6369" decoding="async" height="167" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Edward_Hyatt_Powerplant_during_its_shutdown_in_August_2021-5993.jpg/250px-Edward_Hyatt_Powerplant_during_its_shutdown_in_August_2021-5993.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Edward_Hyatt_Powerplant_during_its_shutdown_in_August_2021-5993.jpg/500px-Edward_Hyatt_Powerplant_during_its_shutdown_in_August_2021-5993.jpg 1.5x" width="250"/>
</a>
<figcaption>
Edward Hyatt Powerplant at Oroville Dam on August 15, 2021: In early August 2021, the hydroelectric power plant was shut down due to low water levels in Lake Oroville caused by the drought in California.
</figcaption>
</figure>
<p>
Due to the low precipitation in the catchment area, water levels were below normal beginning in 2020.
In August 2021, the Hyatt power plant had to be shut down because the water level fell below its water inlets.
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After falling to a record low of 22% capacity by September 30, winter storms increased the lake level by December and the plant was restarted on January 4, 2022.
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<div class="mw-heading mw-heading2">
<h2 id="Operations">
Operations
</h2>
<span class="mw-editsection">
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<h3 id="Hydroelectricity">
Hydroelectricity
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<figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb">
<a class="mw-file-description" href="/wiki/File:Oroville.jpg">
<img class="mw-file-element" data-file-height="2008" data-file-width="1935" decoding="async" height="259" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/Oroville.jpg/250px-Oroville.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/Oroville.jpg/500px-Oroville.jpg 1.5x" width="250"/>
</a>
<figcaption>
Satellite view showing Lake Oroville (right), Oroville Dam (bottom center), and Thermalito Forebay (bottom left)
</figcaption>
</figure>
<p>
Construction of the underground Edward Hyatt Pump-Generating Plant was finished shortly after the completion of Oroville Dam. At the time, it was the largest underground power station in the United States,
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with three 132-
<a class="mw-redirect" href="/wiki/Megawatt" title="Megawatt">
megawatt
</a>
(MW) conventional turbines and three 141 MW pump-generators for a total installed capacity of 819 MW.
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</a>
</sup>
The Hyatt Powerplant is capable of pumping water back into Lake Oroville when surplus power is available. The pump-generators at Hyatt can lift up to 5,610 cubic feet per second (159 m
<sup>
3
</sup>
/s) into Lake Oroville (with a net consumption of 519 MW), while the six turbines combined use a flow of 16,950 cu ft/s (480 m
<sup>
3
</sup>
/s) at maximum generation.
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<p>
Since 1969, the Hyatt plant has worked in tandem with an extensive pumped-storage operation comprising two
<a class="mw-redirect" href="/wiki/Offstream" title="Offstream">
offstream
</a>
reservoirs west of Oroville. These two facilities are collectively known as the
<a href="/wiki/Oroville%E2%80%93Thermalito_Complex" title="OrovilleThermalito Complex">
OrovilleThermalito Complex
</a>
.
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</span>
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Water is diverted into the upper Thermalito reservoir (Thermalito Forebay) via the Thermalito Diversion Dam on the Feather River. During periods of off-peak power use, surplus energy generated at Hyatt is used to lift water from Thermalito's lower reservoir (the Thermalito Afterbay) to the forebay, which releases water back into the afterbay to generate up to 114 MW of power at times of high demand.
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<span class="cite-bracket">
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</sup>
The Hyatt and Thermalito plants produce an average of 2,200
<a class="mw-redirect" href="/wiki/Gigawatt_hour" title="Gigawatt hour">
gigawatt hours
</a>
(GWh) of electricity each year, about half of the total power produced by the SWP's eight hydroelectric facilities.
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</p>
<div class="mw-heading mw-heading3">
<h3 id="Water_supply">
Water supply
</h3>
<span class="mw-editsection">
<span class="mw-editsection-bracket">
[
</span>
<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=15" title="Edit section: Water supply">
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</a>
<span class="mw-editsection-bracket">
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</div>
<p>
Water released from Oroville Dam travels down the Feather River before joining with the
<a href="/wiki/Sacramento_River" title="Sacramento River">
Sacramento River
</a>
, eventually reaching the
<a class="mw-redirect" href="/wiki/Sacramento-San_Joaquin_Delta" title="Sacramento-San Joaquin Delta">
Sacramento-San Joaquin Delta
</a>
, where the SWP's
<a href="/wiki/California_Aqueduct" title="California Aqueduct">
California Aqueduct
</a>
diverts the fresh water for transport to the arid San Joaquin Valley and Southern California. OrovilleThermalito hydroelectric facilities furnish about one-third of the power necessary to drive the pumps that lift the water in the aqueduct from the delta into the valley, and then from the valley over the
<a href="/wiki/Tehachapi_Mountains" title="Tehachapi Mountains">
Tehachapi Mountains
</a>
into coastal Southern California.
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Water and power from the dam contribute to the irrigation of 755,000 acres (306,000 ha) in the arid San Joaquin Valley Westside and municipal supplies to some 25 million people.
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At least 2.8 million acre⋅ft (910 billion US gal; 3.5 trillion L) of water is released.
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<div class="mw-heading mw-heading3">
<h3 id="Flood_control">
Flood control
</h3>
<span class="mw-editsection">
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<figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb">
<a class="mw-file-description" href="/wiki/File:Oroville_dam.jpg">
<img class="mw-file-element" data-file-height="360" data-file-width="541" decoding="async" height="166" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Oroville_dam.jpg/250px-Oroville_dam.jpg" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Oroville_dam.jpg/500px-Oroville_dam.jpg 1.5x" width="250"/>
</a>
<figcaption>
Partial view of the dam's emergency spillway (left) next to its main service spillway (far right) (2008)
</figcaption>
</figure>
<p>
During the winter and early spring, Lake Oroville is required to have at least 750,000 acre⋅ft (240 billion US gal; 930 billion L), or a fifth of the reservoir's storage capacity, available for flood control.
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The dam is operated to maintain an objective flood-control release of 150,000 cubic feet per second (4,200 m
<sup>
3
</sup>
/s), which may be further reduced during large storms when flows below the Feather's confluence with the
<a href="/wiki/Yuba_River" title="Yuba River">
Yuba River
</a>
exceed 300,000 cubic feet per second (8,500 m
<sup>
3
</sup>
/s).
<sup class="reference" id="cite_ref-75">
<a href="#cite_note-75">
<span class="cite-bracket">
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</span>
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<span class="cite-bracket">
]
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</sup>
In the particularly devastating flood of 1997, inflows to the reservoir hit more than 331,000 cubic feet per second (9,400 m
<sup>
3
</sup>
/s), but dam operators managed to limit the outflow to 160,000 cubic feet per second (4,500 m
<sup>
3
</sup>
/s), sparing large regions of the Sacramento Valley from flooding.
<sup class="reference" id="cite_ref-76">
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</p>
<div class="mw-heading mw-heading3">
<h3 id="Feather_River_Fish_Hatchery">
Feather River Fish Hatchery
</h3>
<span class="mw-editsection">
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</span>
<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=17" title="Edit section: Feather River Fish Hatchery">
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</span>
</a>
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<p>
Oroville Dam completely blocks the
<a href="/wiki/Fish_migration#Classification" title="Fish migration">
anadromous migrations
</a>
of
<a href="/wiki/Chinook_salmon" title="Chinook salmon">
Chinook salmon
</a>
and
<a href="/wiki/Rainbow_trout#Steelhead_life_cycle" title="Rainbow trout">
steelhead trout
</a>
in the Feather River. In 1967, in an effort to compensate for lost habitat, the DWR and the
<a class="mw-redirect" href="/wiki/California_Department_of_Fish_and_Game" title="California Department of Fish and Game">
California Department of Fish and Game
</a>
completed the Feather River Fish Hatchery.
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</sup>
The Fish Barrier Dam, built in 1962, intercepts salmon and trout before they reach the base of the impassable Thermalito Diversion Dam and forces them to swim up a
<a href="/wiki/Fish_ladder" title="Fish ladder">
fish ladder
</a>
to the hatchery, which is located on the north bank of the Feather River. The hatchery produces 10 million salmon
<a href="/wiki/Juvenile_fish" title="Juvenile fish">
smolt
</a>
, along with 450,000 trout smolt, to stock in the river each year.
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The salmon smolt are released in two runs, with 20% for the spring run and 80% for the fall run. This facility has been successful enough that concern exists that salmon of hatchery stock are outcompeting remaining wild salmon in the Feather River system.
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<div class="mw-heading mw-heading2">
<h2 id="See_also">
See also
</h2>
<span class="mw-editsection">
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<a href="/w/index.php?title=Oroville_Dam&amp;action=edit&amp;section=18" title="Edit section: See also">
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<div class="mw-heading mw-heading2">
<h2 id="References">
References
</h2>
<span class="mw-editsection">
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<cite class="citation encyclopaedia cs1">
<a class="external text" href="https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/264404" rel="nofollow">
"Lake Oroville"
</a>
.
<i>
<a href="/wiki/Geographic_Names_Information_System" title="Geographic Names Information System">
Geographic Names Information System
</a>
</i>
.
<a href="/wiki/United_States_Geological_Survey" title="United States Geological Survey">
United States Geological Survey
</a>
,
<a href="/wiki/United_States_Department_of_the_Interior" title="United States Department of the Interior">
United States Department of the Interior
</a>
. January 19, 1981
<span class="reference-accessdate">
. Retrieved
<span class="nowrap">
March 31,
</span>
2012
</span>
.
</cite>
<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Lake+Oroville&amp;rft.btitle=Geographic+Names+Information+System&amp;rft.pub=United+States+Geological+Survey%2C+United+States+Department+of+the+Interior&amp;rft.date=1981-01-19&amp;rft_id=https%3A%2F%2Fedits.nationalmap.gov%2Fapps%2Fgaz-domestic%2Fpublic%2Fsearch%2Fnames%2F264404&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOroville+Dam">
</span>
</span>
</li>
<li id="cite_note-NPDP-2">
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^
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</a>
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<cite class="citation web cs1">
<a class="external text" href="http://npdp.stanford.edu/DamDirectory/DamDetail.jsp?npdp_id=CA00035" rel="nofollow">
"Oroville Dam"
</a>
.
<i>
National Performance of Dams Program
</i>
. Stanford University
<span class="reference-accessdate">
. Retrieved
<span class="nowrap">
March 31,
</span>
2012
</span>
.
</cite>
<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=National+Performance+of+Dams+Program&amp;rft.atitle=Oroville+Dam&amp;rft_id=http%3A%2F%2Fnpdp.stanford.edu%2FDamDirectory%2FDamDetail.jsp%3Fnpdp_id%3DCA00035&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOroville+Dam">
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</a>
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The Great New Year's Flood of 1997
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California Data Exchange Center
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California Department of Fish and Wildlife
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</span>
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<cite class="citation web cs1">
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"Mariculture: Chinook Salmon and Steelhead Trout"
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</span>
</span>
</li>
<li id="cite_note-81">
<span class="mw-cite-backlink">
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<a href="#cite_ref-81">
^
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</span>
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<cite class="citation news cs1" id="CITEREFWeston2010">
Weston, Mary (October 8, 2010).
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Further reading
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<cite class="citation report cs1" id="CITEREFReynoldsHartzell1995">
Reynolds, David W.; Hartzell, Curtis L. (September 1995).
<a class="external text" href="https://www.usbr.gov/tsc/techreferences/rec/R9512.pdf" rel="nofollow">
Lake Oroville Runoff Enhancement Project — Final Report
</a>
<span class="cs1-format">
(PDF)
</span>
(Report). United States Department of the Interior, Bureau of Reclamation.
</cite>
<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=report&amp;rft.btitle=Lake+Oroville+Runoff+Enhancement+Project+%E2%80%94+Final+Report&amp;rft.pub=United+States+Department+of+the+Interior%2C+Bureau+of+Reclamation&amp;rft.date=1995-09&amp;rft.aulast=Reynolds&amp;rft.aufirst=David+W.&amp;rft.au=Hartzell%2C+Curtis+L.&amp;rft_id=https%3A%2F%2Fwww.usbr.gov%2Ftsc%2Ftechreferences%2Frec%2FR9512.pdf&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOroville+Dam">
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Oroville Facilities Relicensing
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<ul>
<li>
<a href="/wiki/Beacon_Solar_Project" title="Beacon Solar Project">
Beacon BESS 1
</a>
</li>
<li>
<a href="/wiki/Moss_Landing_Power_Plant#Battery_storage" title="Moss Landing Power Plant">
Elkhorn Battery
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Biomass
<br/>
(≥10
<a class="mw-redirect" href="/wiki/Megawatt" title="Megawatt">
MW
</a>
)
</th>
<td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Hyperion_sewage_treatment_plant" title="Hyperion sewage treatment plant">
Hyperion DGUP
</a>
</li>
<li>
<a href="/wiki/Puente_Hills_Landfill" title="Puente Hills Landfill">
Puente Hills Energy Recovery
</a>
</li>
<li>
<a href="/wiki/Sunshine_Canyon_Landfill" title="Sunshine Canyon Landfill">
Sunshine Gas Producers
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Coal
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Searles_Valley_Minerals#Argus_Cogeneration_Plant" title="Searles Valley Minerals">
Argus Cogeneration Plant
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Geothermal
</th>
<td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Coso_Volcanic_Field" title="Coso Volcanic Field">
Coso
</a>
</li>
<li>
<a href="/wiki/The_Geysers" title="The Geysers">
The Geysers
</a>
</li>
<li>
<a href="/wiki/Imperial_Valley_Geothermal_Project" title="Imperial Valley Geothermal Project">
Imperial Valley
</a>
</li>
<li>
<a href="/wiki/Mammoth_Geothermal_Complex" title="Mammoth Geothermal Complex">
Mammoth
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Natural
<br/>
gas
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Alamitos_Energy_Center" title="Alamitos Energy Center">
Alamitos Energy Center
</a>
</li>
<li>
<a href="/wiki/Donald_Von_Raesfeld_Power_Plant" title="Donald Von Raesfeld Power Plant">
Donald Von Raesfeld Power Plant
</a>
</li>
<li>
<a href="/wiki/Gateway_Generating_Station" title="Gateway Generating Station">
Gateway Generating Station
</a>
</li>
<li>
<a href="/wiki/Glenarm_Power_Plant" title="Glenarm Power Plant">
Glenarm Power Plant
</a>
</li>
<li>
<a href="/wiki/Huntington_Beach_Energy_Project" title="Huntington Beach Energy Project">
Huntington Beach Energy Project
</a>
</li>
<li>
<a href="/wiki/Los_Esteros_Critical_Energy_Facility" title="Los Esteros Critical Energy Facility">
Los Esteros Critical Energy Center
</a>
</li>
<li>
<a href="/wiki/Metcalf_Energy_Center" title="Metcalf Energy Center">
Metcalf Energy Center
</a>
</li>
<li>
<a href="/wiki/Midway-Sunset_Oil_Field#Cogeneration" title="Midway-Sunset Oil Field">
Midway Sunset
</a>
</li>
<li>
<a href="/wiki/Moss_Landing_Power_Plant" title="Moss Landing Power Plant">
Moss Landing Power Plant
</a>
</li>
<li>
<a href="/wiki/Russell_City_Energy_Center" title="Russell City Energy Center">
Russell City Energy Center
</a>
</li>
<li>
<a href="/wiki/Valley_Generating_Station" title="Valley Generating Station">
Valley
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Nuclear
</th>
<td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Diablo_Canyon_Power_Plant" title="Diablo Canyon Power Plant">
Diablo Canyon
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Hydro-
<br/>
electric
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
</div>
<table class="nowraplinks navbox-subgroup" style="border-spacing:0">
<tbody>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Conventional
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/North_Fork_Kings_River#River_modifications" title="North Fork Kings River">
Balch Powerhouse
</a>
</li>
<li>
<a href="/wiki/Upper_North_Fork_Feather_River_Project" title="Upper North Fork Feather River Project">
Belden Powerhouse
</a>
</li>
<li>
<a href="/wiki/Big_Creek_Hydroelectric_Project" title="Big Creek Hydroelectric Project">
Big Creek No. 1, 2, 2A, 3, 4 and 8
</a>
</li>
<li>
<a href="/wiki/Upper_American_River_Project" title="Upper American River Project">
Camino Powerhouse
</a>
</li>
<li>
<a href="/wiki/Upper_North_Fork_Feather_River_Project" title="Upper North Fork Feather River Project">
Caribou No. 1 and 2
</a>
</li>
<li>
<a href="/wiki/California_State_Water_Project#East_Branch" title="California State Water Project">
Devil Canyon
</a>
</li>
<li>
<a href="/wiki/Folsom_Dam" title="Folsom Dam">
Folsom Dam
</a>
</li>
<li>
<a href="/wiki/Upper_American_River_Project" title="Upper American River Project">
Jaybird Powerhouse
</a>
</li>
<li>
<a href="/wiki/Keswick_Dam" title="Keswick Dam">
Keswick Dam
</a>
</li>
<li>
<a href="/wiki/Upper_American_River_Project" title="Upper American River Project">
Loon Lake Powerhouse
</a>
</li>
<li>
<a href="/wiki/Mammoth_Pool_Dam" title="Mammoth Pool Dam">
Mammoth Pool Powerhouse
</a>
</li>
<li>
<a href="/wiki/Moccasin_Dam" title="Moccasin Dam">
Moccasin Powerhouse
</a>
</li>
<li>
<a href="/wiki/New_Bullards_Bar_Dam" title="New Bullards Bar Dam">
New Bullards Bar Dam
</a>
</li>
<li>
<a href="/wiki/New_Don_Pedro_Dam" title="New Don Pedro Dam">
New Don Pedro Dam
</a>
</li>
<li>
<a href="/wiki/New_Exchequer_Dam" title="New Exchequer Dam">
New Exchequer Dam
</a>
</li>
<li>
<a href="/wiki/New_Melones_Dam" title="New Melones Dam">
New Melones Dam
</a>
</li>
<li>
<a class="mw-selflink selflink">
Oroville Dam
</a>
</li>
<li>
<a href="/wiki/Parker_Dam" title="Parker Dam">
Parker Dam
</a>
</li>
<li>
<a href="/wiki/Pine_Flat_Dam" title="Pine Flat Dam">
Pine Flat Dam
</a>
</li>
<li>
<a href="/wiki/Los_Angeles_Aqueduct" title="Los Angeles Aqueduct">
San Francisquito No. 1
</a>
</li>
<li>
<a href="/wiki/Shasta_Dam" title="Shasta Dam">
Shasta Dam
</a>
</li>
<li>
<a href="/wiki/Trinity_Dam" title="Trinity Dam">
Trinity Dam
</a>
</li>
<li>
<a href="/wiki/Upper_American_River_Project" title="Upper American River Project">
White Rock Powerhouse
</a>
</li>
<li>
<a href="/wiki/California_State_Water_Project#West_Branch" title="California State Water Project">
William E. Warne
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Pumped-
<br/>
storage
</th>
<td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Castaic_Power_Plant" title="Castaic Power Plant">
Castaic
</a>
</li>
<li>
<a href="/wiki/Helms_Pumped_Storage_Plant" title="Helms Pumped Storage Plant">
Helms
</a>
</li>
<li>
<a href="/wiki/Big_Creek_Hydroelectric_Project" title="Big Creek Hydroelectric Project">
J.S. Eastwood
</a>
</li>
<li>
<a href="/wiki/O%27Neill_Dam" title="O'Neill Dam">
O'Neill
</a>
</li>
<li>
<a href="/wiki/Oroville%E2%80%93Thermalito_Complex" title="OrovilleThermalito Complex">
Thermalito
</a>
</li>
<li>
<a href="/wiki/San_Luis_Dam" title="San Luis Dam">
William R. Gianelli
</a>
</li>
</ul>
</div>
</td>
</tr>
</tbody>
</table>
<div>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Solar
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
</div>
<table class="nowraplinks navbox-subgroup" style="border-spacing:0">
<tbody>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
<a href="/wiki/Photovoltaic_power_station" title="Photovoltaic power station">
PV
</a>
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Antelope_Valley_Solar_Ranch" title="Antelope Valley Solar Ranch">
Antelope Valley Solar Ranch
</a>
</li>
<li>
<a href="/wiki/Beacon_Solar_Project" title="Beacon Solar Project">
Beacon Solar Project
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Blythe_Solar_Power_Project" title="Blythe Solar Power Project">
Blythe Solar Power Project
</a>
</li>
<li>
<a href="/wiki/California_Flats_Solar_Project" title="California Flats Solar Project">
California Flats Solar Project
</a>
</li>
<li>
<a href="/wiki/California_Valley_Solar_Ranch" title="California Valley Solar Ranch">
California Valley Solar Ranch
</a>
</li>
<li>
<a href="/wiki/Campo_Verde_Solar_Project" title="Campo Verde Solar Project">
Campo Verde Solar Project
</a>
</li>
<li>
<a href="/wiki/Catalina_Solar_Project" title="Catalina Solar Project">
Catalina Solar Project
</a>
</li>
<li>
<a href="/wiki/Centinela_Solar_Energy_Project" title="Centinela Solar Energy Project">
Centinela Solar Energy Project
</a>
</li>
<li>
<a href="/wiki/Stateline_Solar" title="Stateline Solar">
Desert Stateline Solar Facility
</a>
</li>
<li>
<a href="/wiki/Desert_Sunlight_Solar_Farm" title="Desert Sunlight Solar Farm">
Desert Sunlight Solar Farm
</a>
</li>
<li>
<a href="/wiki/Imperial_Solar_Energy_Center_South" title="Imperial Solar Energy Center South">
Imperial Solar Energy Center South
</a>
</li>
<li>
<a href="/wiki/Imperial_Solar_Energy_Center_West" title="Imperial Solar Energy Center West">
Imperial Solar Energy Center West
</a>
</li>
<li>
<a href="/wiki/McCoy_Solar_Energy_Project" title="McCoy Solar Energy Project">
McCoy Solar Energy Project
</a>
</li>
<li>
<a href="/wiki/Mount_Signal_Solar" title="Mount Signal Solar">
Mount Signal Solar
</a>
</li>
<li>
<a href="/wiki/Panoche_Valley_Solar_Farm" title="Panoche Valley Solar Farm">
Panoche Valley Solar Farm
</a>
</li>
<li>
<a href="/wiki/Solar_Star" title="Solar Star">
Solar Star
</a>
</li>
<li>
<a href="/wiki/Springbok_Solar_Farm" title="Springbok Solar Farm">
Springbok Solar Farm
</a>
</li>
<li>
<a href="/wiki/Topaz_Solar_Farm" title="Topaz Solar Farm">
Topaz Solar Farm
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Thermal
</th>
<td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Genesis_Solar_Energy_Project" title="Genesis Solar Energy Project">
Genesis Solar Energy Project
</a>
</li>
<li>
<a href="/wiki/Ivanpah_Solar_Power_Facility" title="Ivanpah Solar Power Facility">
Ivanpah Solar Power Facility
</a>
</li>
<li>
<a href="/wiki/Mojave_Solar_Project" title="Mojave Solar Project">
Mojave Solar Project
</a>
</li>
<li>
<a href="/wiki/Solar_Energy_Generating_Systems" title="Solar Energy Generating Systems">
Solar Energy Generating Systems
</a>
</li>
</ul>
</div>
</td>
</tr>
</tbody>
</table>
<div>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
Wind
</th>
<td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Alta_Wind_Energy_Center" title="Alta Wind Energy Center">
Alta Wind Energy Center
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Altamont_Pass_Wind_Farm" title="Altamont Pass Wind Farm">
Altamont Pass Wind Farm
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/San_Gorgonio_Pass_Wind_Farm" title="San Gorgonio Pass Wind Farm">
San Gorgonio Pass Wind Farm
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Shiloh_Wind_Power_Plant" title="Shiloh Wind Power Plant">
Shiloh Wind Power Plant
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Tehachapi_Pass_Wind_Farm" title="Tehachapi Pass Wind Farm">
Tehachapi Pass Wind Farm
</a>
</li>
</ul>
</div>
</td>
</tr>
</tbody>
</table>
</div>
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California State Water Project
</a>
</div>
</th>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
<a href="/wiki/Dam" title="Dam">
Dams
</a>
</th>
<td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Antelope_Dam_(California)" title="Antelope Dam (California)">
Antelope
</a>
</li>
<li>
<a href="/wiki/San_Luis_Dam" title="San Luis Dam">
B.F. Sisk
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Bethany_Dam&amp;action=edit&amp;redlink=1" title="Bethany Dam (page does not exist)">
Bethany
</a>
</li>
<li>
<a href="/wiki/Castaic_Dam" title="Castaic Dam">
Castaic
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Cedar_Springs_Dam" title="Cedar Springs Dam">
Cedar Springs
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Del_Valle_Dam" title="Del Valle Dam">
Del Valle
</a>
</li>
<li>
<a href="/wiki/Elderberry_Forebay_Dam" title="Elderberry Forebay Dam">
Elderberry Forebay
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Fish_Barrier_Dam&amp;action=edit&amp;redlink=1" title="Fish Barrier Dam (page does not exist)">
Fish Barrier
</a>
</li>
<li>
<a href="/wiki/Frenchman_Lake_(California)" title="Frenchman Lake (California)">
Frenchman
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Grizzly_Valley_Dam" title="Grizzly Valley Dam">
Grizzly Valley
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Little_Panoche_Detention_Dam&amp;action=edit&amp;redlink=1" title="Little Panoche Detention Dam (page does not exist)">
Little Panoche
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Los_Banos_Detention_Dam&amp;action=edit&amp;redlink=1" title="Los Banos Detention Dam (page does not exist)">
Los Banos Dam
</a>
</li>
<li>
<a href="/wiki/O%27Neill_Dam" title="O'Neill Dam">
O'Neill
</a>
</li>
<li>
<a class="mw-selflink selflink">
Oroville
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Perris_Dam" title="Perris Dam">
Perris
</a>
</li>
<li>
<a href="/wiki/Pyramid_Dam" title="Pyramid Dam">
Pyramid
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Quail_Lake_Dam&amp;action=edit&amp;redlink=1" title="Quail Lake Dam (page does not exist)">
Quail Lake
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Thermalito_Afterbay_Dam" title="Thermalito Afterbay Dam">
Thermalito Afterbay
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Thermalito_Diversion_Dam&amp;action=edit&amp;redlink=1" title="Thermalito Diversion Dam (page does not exist)">
Thermalito Diversion
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Thermalito_Forebay_Dam&amp;action=edit&amp;redlink=1" title="Thermalito Forebay Dam (page does not exist)">
Thermalito Forebay
</a>
</li>
</ul>
</div>
</td>
</tr>
<tr>
<th class="navbox-group" scope="row" style="width:1%">
<a href="/wiki/Reservoir" title="Reservoir">
Reservoirs
</a>
</th>
<td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0">
<div style="padding:0 0.25em">
<ul>
<li>
<a href="/wiki/Antelope_Dam_(California)" title="Antelope Dam (California)">
Antelope Lake
</a>
</li>
<li>
<a href="/wiki/Bethany_Reservoir" title="Bethany Reservoir">
Bethany Reservoir
</a>
</li>
<li>
<a href="/wiki/Castaic_Lake" title="Castaic Lake">
Castaic Lake
</a>
</li>
<li>
<a href="/wiki/Clifton_Court_Forebay" title="Clifton Court Forebay">
Clifton Court Forebay
</a>
</li>
<li>
<a href="/wiki/Elderberry_Forebay" title="Elderberry Forebay">
Elderberry Forebay
</a>
</li>
<li>
<a href="/wiki/Frenchman_Lake_(California)" title="Frenchman Lake (California)">
Frenchman Lake
</a>
</li>
<li>
<a href="/wiki/Lake_Davis" title="Lake Davis">
Lake Davis
</a>
</li>
<li>
<a href="/wiki/Lake_Del_Valle" title="Lake Del Valle">
Lake Del Valle
</a>
</li>
<li>
<a href="/wiki/Lake_Oroville" title="Lake Oroville">
Lake Oroville
</a>
</li>
<li>
<a href="/wiki/Lake_Perris" title="Lake Perris">
Lake Perris
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Little_Panoche_Reservoir&amp;action=edit&amp;redlink=1" title="Little Panoche Reservoir (page does not exist)">
Little Panoche Reservoir
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Los_Banos_Reservoir&amp;action=edit&amp;redlink=1" title="Los Banos Reservoir (page does not exist)">
Los Banos Reservoir
</a>
</li>
<li>
<a href="/wiki/O%27Neill_Forebay" title="O'Neill Forebay">
O'Neill Forebay
</a>
</li>
<li>
<a href="/wiki/Pyramid_Lake_(Los_Angeles_County,_California)" title="Pyramid Lake (Los Angeles County, California)">
Pyramid Lake
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Quail_Lake" title="Quail Lake">
Quail Lake
</a>
</li>
<li>
<a href="/wiki/San_Luis_Reservoir" title="San Luis Reservoir">
San Luis Reservoir
</a>
</li>
<li>
<a href="/wiki/Silverwood_Lake" title="Silverwood Lake">
Silverwood Lake
</a>
</li>
<li>
<a class="new" href="/w/index.php?title=Tehachapi_Afterbay&amp;action=edit&amp;redlink=1" title="Tehachapi Afterbay (page does not exist)">
Tehachapi Afterbay
</a>
</li>
<li>
<a class="mw-redirect" href="/wiki/Thermalito_Afterbay" title="Thermalito Afterbay">
Thermalito Afterbay
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