312:. The dam stands 87 feet and spans 1,093 feet. The Nimbus powerplant consists of two generators. Each generator produces enough electrical power to power over 200,000 100-watt light bulbs, about 15,500 kilowatts of electrical power. Nimbus Dam consists of 18 radial gates, each with their own gate bays. These 18 gates today are the ones that were completed in 1955 along with the rest of the dam. Of the eighteen gates, four of them have had their coating system replaced. This protects the gates from a faster rate of corrosion. The other fourteen gates have the original coating.
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protection acts. The report argues that over half the radial gates of Nimbus Dam need a new coating system, along with other repairs that fall outside of normal maintenance. No major work has been done to the gates since the construction of the dam in the 1950s. In 2014, the Bureau of
Reclamation contributed an $ 11,141,820 contract for the construction. The project is expected to be completed by the end of 2019 and will focus on replacing the coating on the fourteen gates that have the original quoting. The project will also include the construction of a storage facility.
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Basin became permanently closed to all fishing. The closure of the basin is an effort to reorienting the fish ladder as part of the Nimbus
Hatchery Fish Passage Project, which would create a system of collecting steelhead and adult salmon for the hatchery. The project would also include changes that would minimize flow fluctuations in the river associated with the weir of the hatchery, as well as eliminate safety concerns associated with the existing weir.
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in the lower
American River, the County of Sacramento created a Water Forum in 1993. Working together with water managers from Eldorado and Placer Counties, the Forum plans to provide a clean and reliable supply of water to the region by 2030 and to protect the wildlife and fish in the Lower American
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The water in Lake Natoma, which is the lake created by Nimbus Dam, is too cold for warmwater production of fish, and never has the lake been a natural producer of fish. The rapid water exchange from Nimbus Dam sharply decreases the production of plankton, which inhibits trout growth. The
Department
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Nearly half of the annual precipitation in the
Sacramento area occurs during a span of 60 days in the winter months, while during the summer, only about one percent of the annual precipitation falls. In the American River Basin, approximately 40% of the annual runoff is a result of melting snow in
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Fishing has been a popular recreational use of the waters below Nimbus Dam since the Nimbus Fish
Hatchery was built in 1958. However, the amount of fishing that was being done severely impacted the spawning locations of fish once passed the fish ladder at the hatchery. On March 1, 2018, the Nimbus
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125 miles of habitat for
Chinook and steelhead salmon were accessible in the American River Watershed before the construction of Nimbus Dam. When the dam was constructed in the 1950s, this habitat area was dramatically decreased in size, as the salmon were not able to pass through the dam. To make
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The Nimbus
Powerplant is located on the north side of the American River and on the left side of Nimbus Dam via looking east. The powerplant provides backup to the main powerplant that is located upstream at Folsom Dam. Each of the two generators contain approximately 7,700 kilowatts of electrical
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Along with laying out the plan for the project, managers were to abide by federal and state environmental regulations. In the writing of the final report for the maintenance project, the regulations that the project would abide by include the Fish and
Wildlife Coordination Act, Endangered Species
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power. What drives the two generators through six penstocks, each about 47 feet long, are the two turbines with 9,400 horsepower. Water is supplied through these turbines. The
Western Area Power Administration markets the power that is generated by the powerplants at Nimbus Dam and Folsom Dam.
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released a final environmental assessment for the Nimbus Dam Radial Gates Maintenance Project in May 2015. This report laid out the purpose and need for the project, the details of what the construction would consist of, and the environmental impact of the project on existing federal wildlife
351:, which carries water to an area approximately 10 miles northeast of the city of Lodi. The canal once provided cooling water for the SMUD nuclear power plant, Rancho Seco. Today, it continues to provide water for irrigation, water supply, and industrial purposes to its surrounding area.
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Act, Migratory Bird Treaty, executive orders for floodplain management and the protection of wetlands, Clean Air Act, and the Clean Water Act. Complying with these regulations means the project would be completed without significant environmental damage.
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of Fish and Game annually plants Lake Natoma with 20,000 to 30,000 catchable-sized trout. The water exchange in the lake during the summer season increases with the operation of the Auburn-Folsom South Project. This ultimately lowers water temperatures.
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River. Signed in April 2000, the Water Forum Agreement called for the implementation of increased surface water diversions, habitat management, water conservation, and an improved standard of flow
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the Sierra Nevada Mountains. As a result, low natural flow rates in the American River system in the later summer months. As a result, the dam fluctuates water output throughout the year.
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in 1958 downstream from Nimbus Dam. The purpose of the hatchery was to provide the salmon with an artificial spawning habitat before they are let back out into the wild.
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599:"Final Environmental Assessment: Nimbus Dam Radial Gates Maintenance Project"
474:"Final Environmental Assessment: Nimbus Dam Radial Gates Maintenance Project"
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Preliminary Draft Environmental Impact Report on Nimbus Dam and Lake Natoma
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The Nimbus recreational area. The dam can be seen in the background.
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United States Bureau of Reclamation.gov: Nimbus Dam fact sheet
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https://www.usbr.gov/mp/arwec/facts-nimbus-dam-powerplant.html
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Buildings and structures in Sacramento County, California
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Due to the contamination of the groundwater because of
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Hydrology of the Lower American River and Water Quality
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The dam serves as a diversion to direct water into the
335:. Construction began in 1952, and it opened in 1955.
665:. Sacramento River Watershed Program. Archived from
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648:. California State University, Sacramento.
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432:List of dams and reservoirs in California
1099:United States Bureau of Reclamation dams
566:Reclamation: Managing Water in the West
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702:Philips and Morse (28 February 2018).
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527:American River Basin Development Act,
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770:Central Valley Project Infrastructure
568:. United States Bureau of Reclamation
241:1,898 sq mi (4,920 km)
7:
706:. CA Department of Fish and Wildlife
16:Dam in Sacramento County, California
392:The fish weir downstream of the dam
361:United States Bureau of Reclamation
355:The Nimbus Dam Radial Gates Project
534:Tooltip Public Law (United States)
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1114:1955 establishments in California
663:"Lower American River Watershed"
644:Tanimoto, James (16 May 1979).
331:, and a diversion pool for the
1:
1063:C.W. Bill Jones Pumping Plant
704:"Nimbus Basin Will be Closed"
181:Elevation at crest
372:Impact on Fish and Wildlife
321:California's Central Valley
127:; 69 years ago
109:; 72 years ago
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1084:Dams on the American River
176:1,093 ft (333 m)
411:environmental degradation
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79:38.636095°N 121.219806°W
826:Red Bluff Diversion Dam
297:. Approximately 8,700
252:Installed capacity
200:135 ft (41 m)
192:28 ft (8.5 m)
184:132 ft (40 m)
104:Construction began
1104:Dams completed in 1955
1094:Central Valley Project
622:Cite journal requires
497:Cite journal requires
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317:Central Valley Project
265:Annual generation
168:87 ft (27 m)
84:38.636095; -121.219806
991:Stockton Ship Channel
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339:The Nimbus Powerplant
144:Bureau of Reclamation
909:Sugar Pine Reservoir
688:Nimbus Fish Hatchery
383:Nimbus Fish Hatchery
996:Tehama-Colusa Canal
966:Delta–Mendota Canal
961:Delta Cross Channel
562:"Nimbus Powerplant"
237:Catchment area
75: /
1109:Dams in California
971:Folsom South Canal
951:Contra Costa Canal
946:Clear Creek Tunnel
904:San Luis Reservoir
669:on 1 February 2020
587:Folsom South Canal
456:2019-03-30 at the
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349:Folsom South Canal
333:Folsom South Canal
295:Folsom, California
189:Width (crest)
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1037:San Joaquin River
976:Friant-Kern Canal
287:hydroelectric dam
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197:Width (base)
150:Dam and spillways
122:Opening date
48:Sacramento County
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1056:Other facilities
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1032:Sacramento River
1022:Chowchilla River
924:Whiskeytown Lake
894:New Melones Lake
846:Spring Creek Dam
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981:Madera Canal
919:Trinity Lake
841:Sly Park Dam
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806:Lewiston Dam
708:. Retrieved
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671:. Retrieved
667:the original
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615:cite journal
603:. Retrieved
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1017:Clear Creek
914:Shasta Lake
889:Lake Natoma
879:Folsom Lake
856:Trinity Dam
821:O'Neill Dam
307:Lake Natoma
269:51,097,000
230:Lake Natoma
99:Operational
82: /
70:121°13′11″W
58:Coordinates
1078:Categories
1027:Kern River
871:Reservoirs
836:Shasta Dam
816:Nimbus Dam
801:Friant Dam
796:Folsom Dam
786:Auburn Dam
601:. May 2015
548:, enacted
540:, 63
476:. May 2015
438:References
329:Folsom Dam
280:Nimbus Dam
67:38°38′10″N
52:California
22:Nimbus Dam
934:Aqueducts
325:reservoir
310:reservoir
299:acre-feet
284:base load
221:Reservoir
210:acre-feet
673:10 April
480:19 March
454:Archived
426:See also
155:Impounds
140:Owner(s)
44:Location
710:7 April
605:5 April
572:5 April
530:Pub. L.
289:on the
226:Creates
130: (
112: (
91:,inline
36:Country
1005:Rivers
938:canals
544:
538:81–356
536:
208:8,760
173:Length
165:Height
96:Status
542:Stat.
516:House
293:near
282:is a
256:13.5
936:and
778:Dams
712:2019
675:2019
628:help
607:2019
574:2019
503:help
482:2019
359:The
327:for
278:The
132:1955
125:1955
114:1952
107:1952
546:852
303:dam
271:KWh
214:dam
1080::
694:^
654:^
636:^
619::
617:}}
613:{{
564:.
494::
492:}}
488:{{
465:^
258:MW
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762:e
755:t
748:v
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
