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half of the flow that caused the damage. The
Sacramento District, under the direction of the district engineer, Lt. Col. Chambers, and by the authority of the 1936 Act, conducted a study of the area in 1937. Their study, completed in 1940, disclosed that roughly $ 750,000 (over $ 12 million today) in flood control benefits would be realized with the completion of regulatory works on the Kern River. Their study also showed that an average benefit to irrigation and existing power facilities of $ 185,000 ($ 2.5 million today) could be gained as well. After the District filed its report, Congress authorized the Isabella Project in the 1944 Flood Control Act. Construction began in 1948, under contract with Rand Construction Company, and completed in 1953; the federal government spent $ 22 million ($ 305 million today) for the project.
340:. The city had been flooded in 1867 and 1893. In 1950, while the dam was under construction, they experienced flooding measuring 30,000 cubic feet (850 m) of water per second. The dam was completed in March 1953. The U.S. Corps of Engineers built earthen dams across two forks of the Kern River to create the Isabella reservoir, Kern County's largest body of water year round with a surface area of 11,200 acres (4,500 ha). During the construction of the dam and reservoir the towns of Lake Isabella and Kernville both had to be moved to higher ground. Most of the original town of Kernville had been razed in 1948, in preparation for the construction of the dam.
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441:) began a dam safety modification study (DSMS) in 2006 to address seismic, hydrologic (potential overtopping during an extreme flood event) and seepage issues at the dams. On April 28, 2006, a seepage problem was found in the Isabella Auxiliary Dam. Officials determined that it would be necessary to restrict the maximum reservoir elevation to 20 feet (6.1 m) below the spillway, or normal "full" pool. The dam's releases through the outlet were increased, allowing the water to flow at 4,500 cubic feet per second (130 m/s).
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decrease effects to recreation. An operating restriction is currently in place, limiting the lake's normal storage capacity, to reduce the risk of the seepage and seismic concerns while a permanent solution is investigated. USACE has implemented increased surveillance and monitoring; stockpiling of emergency materials; warning sirens in the town of Lake
Isabella; installation of additional instrumentation for monitoring; and continued public outreach with Kern County and the local public.
390:. Water from Lake Isabella can be used in any of three ways. It is released into the Lower Kern River from the main dam, through the hydroelectric project in the main dam, or through the hydroelectric project in the auxiliary dam. The design capacity of the release channel (the Lower Kern River) is over 8,000 cubic feet per second (230 m/s). If Lake Isabella is above 110,000 acre-feet (140,000,000 m), the water can also be diverted into the Borel project at the main dam.
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Relocation, Rearrangement, and
Alteration of Borel Facilities requires that the Corps make available to the Borel project the full flow of the Kern River and all releases from storage in Isabella Reservoir. In addition, the Corps must operate and maintain Isabella Dam and reservoir in a manner that will not interfere with or otherwise reduce the efficiency or capacity of the operation of the Borel project.
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449:, which travels through the canyon between Bakersfield and Lake Isabella, became unstable, and one lane was closed due to the high water levels. Some flooding was reported by property owners along the river. Emergency management officials warned that if Isabella Dam were to fail when the reservoir was full, a large part of Bakersfield would be inundated within 2 to 4 hours.
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dam will include excavation of a new emergency spillway, modifications to the existing service spillway, a 16-foot (4.9 m) raise of the main dam, modifications to
California State Route 155 at the main dam's right abutment, and modifications at several recreation facilities north of the auxiliary dam. Construction began in 2018 and was completed in 2022.
464:(FEIS) on March 23, 2012, reporting their plans for the future of the dam. The plans included structural improvements in order to reduce the risk to the public and property from floods, earthquakes, and seepage. Part of the plan included raising both dams approximately 16 feet (4.9 m), a new 900 feet (270 m) emergency spillway, and moving
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544:. Water sports allowed on the lake also include boating, sailing, jet skiing, water skiing, and wind surfing. Boating and fishing permits are available at any marina and at several convenience stores in the Lake Isabella area. Whitewater rafting, kayaking, and fishing are also permitted along the Kern River.
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said the model is approximately one-third the size of a football field. In 2013, following the signing of the Record of
Decision in December 2012, the Corps entered the Pre-Construction Engineering and Design phase of the project. A number of procedural tasks must still be completed in preparation of
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Hydroelectric development on the Kern River in central
California began in 1894 when the Power, Transit and Light Company started construction of a small plant at the mouth of Kern Canyon. The following year, the Kern River and Los Angeles Electric Power Company obtained water rights on the river and
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In May 2006, due to more than average rainfall and snowpack in the mountains, and warmer than average temperatures in the area, the Upper Kern River was filling Lake
Isabella faster than officials could lower it. The Lower Kern River was also running higher than normal, and flowing at up to 20 miles
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In
September 2017, The Corp awarded a $ 204 million contract to Flatiron/Dragados/Sukut Joint Venture of Benicia to construct modifications to the Isabella Lake Dam in Lake Isabella. The contract includes addressing the identified overtopping, seismic, and seepage concerns. Construction at the main
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Bakersfield sustained extensive damage by being seventeen feet below the flood crest of the 1937 flood of the San
Joaquin River Basin. During 1943, some $ 10 million ($ 137 million today) worth of flood damage was done to agriculture alone in the Tulare Lake Basin; the Kern River contributed almost
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The project will not increase the current storage level or capacity of the dam. The Corps explained that would require an additional study and authorization. However, during the construction, the water level will be intentionally lowered, if need be. The Corps added that it will take measures to
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After the news of the seepage, the dam came under further attention due to being situated on a fault line. The fault line was thought to be inactive, but in
February 2007, a study by the U.S. Army Corps of Engineers found evidence of at least one earthquake in the last 5,000 years, and therefore
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Because construction of Isabella Dam would bisect the Borel canal, the Corps entered into an agreement with SCE such that the dam would be built in a manner to "afford operation conditions at least equal to that existing in the Borel Canal under pre-project conditions." That 1950 Contract for
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In January 2014, the Corps had an "Agency Technical Review" for the first 35 percent of the planning of the project. The Corps began testing water flow of a model of the project that was built and was studied at Utah State University. John Prettyman of the USACE in
383:. The main reservoir, Lake Isabella, can hold up 570,000 acre-feet (700,000,000 m) of water. Normal release from the main dam is 3,000 cubic feet per second (85 m/s), maximum historical releases were 7,200 cubic feet per second (200 m/s) in 1983.
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to ensure negligible impacts on fish and wildlife or environmental loss. Existing downstream water would also be maintained in cooperation with power generators and irrigators, as is required in the initial relocation agreement in 1950.
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uses. Lake Isabella (the reservoir created by the dam) also serves as a recreational and tourist attraction. Water sports, fishing, boating, camping, and hiking are common throughout the area, as well as the
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Below Isabella Dam, the Kern River flows southwest through approximately 30 miles (48 km) of a canyon, locally known as Kern Canyon, with many steep cliffs and turns along the southern edge of the
510:. The National Forest contains over 2,500 miles (4,000 km) of road and 850 miles (1,370 km) of trails, and hosts a number of camping and recreational facilities. The forest is adjacent to
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Isabella Dam consists of two dams, a "main dam", and an "auxiliary dam". The main dam is of earthen build, 1,695 feet (517 m) long and 98 feet (30 m) tall, and owned and maintained by the
348:, roughly 15 miles (24 km) east of Bakersfield. Once it reaches Bakersfield, the river loses most of its remaining flow; much of it is diverted and channelized before reaching the city center.
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judged the fault line as active. With the new information about the fault line, the study said the dam was not likely to be in danger. On November 9, 2007, the Corps of Engineers released the
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and State Route 178 above the new crest line. Changes made to the original plan also reduced impacts on recreation, biological resources, and water quality. The planners consulted with the
457:, that confirmed the high-risk classification of the dam, ranking Isabella Dam among the 6 highest risk and highest priority dams in America, and later elevated it to the highest priority.
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On March 12, 2008, local officials brought in a team of emergency response experts, and began work on an evacuation plan in case Isabella Dam were to fail. The Corps released a
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With more than 300,000 people living and working below the dams, primarily in the town of Lake Isabella and the city of Bakersfield, the U.S. Army Corps of Engineers (
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Bakersfield and about 350,000 acres (140,000 ha) of farm land and oil fields in the Kern River region are protected by the project. As a partner to dams on the
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The auxiliary dam is part of the Borel Hydroelectric Project. The canal for the Borel project diverts water from 5.5 miles (8.9 km) upstream of Isabella Dam.
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planned construction of a power plant. This project, Borel Hydroelectric Project, was built to provide power for the growing Red Electric Streetcar (also known as
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https://www.spk.usace.army.mil/Media/News-Releases/Article/3465598/usace-lowers-isabella-dam-risk-rating-lifts-operating-restrictions/#:~:text=With
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The Borel project was decommissioned in 2018 and the easement through the Auxiliary Dam was sealed in February 2019.
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Durham's Place Names of Central California: Includes Madera, Fresno, Tulare, Kings & Kern Counties
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The area hosts over 30 designated campgrounds surrounding the reservoir, many within the
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814:"Sacramento District > Missions > Civil Works > Isabella Dam"
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Rivers, the Isabella dam helps curb flood losses to cropland in the
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Corps of Engineers Releases External Review Report on Isabella Dam
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This article incorporates text from this source, which is in the
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Work starts on evacuation plans in case of Isabella Dam failure
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physical construction, which is scheduled to begin in 2017.
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was founded by Steven Barton in 1893 and named in honor of
921:"Isabella Lake Dam Safety Modification Project Final EIS"
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Perspective: Lower Kern River not yet as high as in 1983
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Auxiliary Isabella Dam, with Lake Isabella at its base
963:"Lake Isabella Dam restoration project moves forward"
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Buildings and structures in Kern County, California
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1996 California Hydrologic Data Report, Borel Canal
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1008:the completion of work,4%2C signifying a low risk.
386:The reservoir that Isabella Dam creates is called
332:. In 1948, Congress appropriated funds to build a
720:"FLOODS OF DECEMBER 1937 IN NORTHERN CALIFORNIA"
621:"California Hydroelectric Statistics & Data"
944:"Isabella Lake Dam Safety Modification Project"
746:US Army Corps of Engineers: Sacramento District
328:of Spain while her name was popular during the
623:. California Energy Commission. Archived from
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1039:Lakes Online – Lake Isabella Dam Information
650:Lakes Online – Lake Isabella Dam Information
919:U.S. Army Corps of Engineers (2012-03-23).
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1045:KRVR.org – Lake Isabella Dam Safety Forum
831:Kern River Especially Dangerous This Year
602:List of dams and reservoirs in California
182:49,000 cu ft/s (1,400 m/s)
1594:Hydroelectric power plants in California
886:, Release No. PA-07-14, November 9, 2007
742:"Sacramento District History: 1929–2004"
403:) transportation system in Los Angeles.
1624:Energy infrastructure completed in 1953
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445:per hour (32 km/h) in some parts.
433:Isabella Dam, with Lake Isabella beyond
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417:Lake Isabella Dam Restoration Project
215:2,074 sq mi (5,370 km)
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1023:County of Kern: Parks and Recreation
462:Final Environmental Impact Statement
205:568,000 acre⋅ft (0.701 km)
667:. Quill Driver Books. p. 132.
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1629:1953 establishments in California
1043:Kern River Valley Revitalization
864:Fault Beneath Isabella Dam Active
961:Bodine, Mike (January 8, 2014).
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729:. US Department of the Interior.
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1439:Kern River Water Infrastructure
882:U.S. Army Corps of Engineers,
844:Canyon road along river cracks
16:Dam in Kern County, California
1:
455:Isabella Dam Consensus Report
276:course, between the towns of
381:U.S. Army Corps of Engineers
223:11,000 acres (4,500 ha)
131:U.S. Army Corps of Engineers
800:September 17, 2008, at the
394:Borel Hydroelectric Project
109:; 71 years ago
91:; 76 years ago
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1019:"Lake Isabella Recreation"
948:US Army Corps of Engineers
371:Construction and operation
164:1,695 ft (517 m)
661:Durham, David L. (2000).
502:Isabella Recreation Sites
470:Fish and Wildlife Service
330:1893 Columbian Exposition
272:, about halfway down the
174:Ungated concrete overflow
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1589:Dams in the Tulare Basin
1166:Marble Fork Kaweah River
1161:Middle Fork Kaweah River
1081:Tulare Basin hydrography
740:Collins, Willie (2006).
1254:South Branch Tule River
1249:North Branch Tule River
1176:South Fork Kaweah River
1156:North Fork Kaweah River
1107:Middle Fork Kings River
592:Renewable energy portal
508:Sequoia National Forest
336:to prevent flooding of
310:Sequoia National Forest
234:Installed capacity
156:185 ft (56 m)
86:Construction began
43:Kern County, California
1619:Dams completed in 1953
1239:Middle Fork Tule River
1171:East Fork Kaweah River
1102:South Fork Kings River
1097:North Fork Kings River
718:Ickes, Harold (1939).
503:
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247:Annual generation
179:Spillway capacity
70:35.64611°N 118.48222°W
1362:South Fork Kern River
1244:South Fork Tule River
1234:North Fork Tule River
967:The Daily Independent
501:
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133:, Sacramento District
1137:Rodgers Crossing Dam
295:Isabella Dam serves
75:35.64611; -118.48222
1383:California Aqueduct
873:, February 28, 2007
346:Greenhorn Mountains
211:Catchment area
202:Total capacity
66: /
1584:Dams in California
1307:Golden Trout Creek
1287:Buena Vista Slough
973:on August 13, 2016
905:2009-02-19 at the
869:2011-07-19 at the
849:2011-07-13 at the
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1609:Earth-filled dams
1599:Kern River Valley
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1553:Kern Island Canal
1533:Buena Vista Canal
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1388:Friant-Kern Canal
1347:Little Kern River
1327:Kern River Slough
1322:Kern River Canyon
1302:Connecting Slough
950:. April 11, 2016.
842:Kern Valley Sun,
771:Kern Valley Sun,
674:978-1-884995-33-0
564:California portal
270:Kern River Valley
259:
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220:Surface area
138:Dam and spillways
104:Opening date
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1312:Isabella Dam
1311:
1264:Lake Success
1211:Terminus Dam
1206:Mineral King
1148:Kaweah River
1122:Kings Canyon
1117:Dinkey Creek
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975:. Retrieved
971:the original
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578:Water portal
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297:agricultural
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262:Isabella Dam
261:
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22:Isabella Dam
1563:Stine Canal
1398:White River
1378:Tulare Lake
1297:Clear Creek
1259:Success Dam
1216:Lake Kaweah
1191:Horse Creek
1089:Kings River
365:Tulare Lake
338:Bakersfield
286:Kern County
255:(2001–2012)
251:22,610,000
122:Operator(s)
73: /
61:118°28′56″W
49:Coordinates
33:Aerial view
1578:Categories
1477:Lake Evans
1469:Reservoirs
1459:South Fork
1454:Kern River
1393:Mill Creek
1357:Rock Creek
1352:Poso Creek
1337:Lake Evans
1274:Kern River
1226:Tule River
1139:(proposed)
929:2019-02-19
704:2008-09-05
631:2018-04-26
608:References
494:Recreation
479:Sacramento
316:Background
290:California
274:Kern River
58:35°38′46″N
1492:Lake Webb
1487:Lake Ming
1342:Lake Webb
1332:Kern Lake
977:April 30,
862:KERO 23,
278:Kernville
187:Reservoir
170:Spillways
903:Archived
867:Archived
847:Archived
798:Archived
548:See also
534:bluegill
322:Isabella
143:Impounds
39:Location
896:KBAK-TV
827:KERO-TV
796:, 1996
542:catfish
538:crappie
512:Sequoia
401:Red Car
192:Creates
112: (
94: (
1520:Canals
1446:Rivers
671:
540:, and
357:Kaweah
303:, and
264:is an
161:Length
153:Height
1371:Other
924:(PDF)
723:(PDF)
526:trout
439:USACE
353:Kings
1502:Dams
979:2016
790:USGS
727:USGS
669:ISBN
530:bass
514:and
361:Tule
359:and
280:and
114:1953
107:1953
96:1948
89:1948
334:dam
284:in
253:KWh
238:12
1580::
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240:MW
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98:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
