Lewiston Dam, Shasta/Trinity River Division Project, was built from 1960-1963 about 7 miles downstream from Trinity Dam. The dam creates an afterbay to Trinity Powerplant and diverts water by means of Clear Creek Tunnel to Whiskeytown Lake. It is an earthfill structure 91 feet high and 754 feet long, forming a reservoir with a capacity of 14,660 acre-feet.
Lewiston Lake is a reservoir created by Lewiston Dam on the Trinity River, near the towns of Weaverville and Lewiston in Trinity County, Calif. It is used for transbasin diversion to the Sacramento River and flood control, as well as for hydroelectric generation. It is a popular destination for fishing (rainbow, brown and brook trout), kayaking, and camping.
General
Project
CVP-Shasta/Trinity
Watercourse
Trinity River
Reservoir
Lewiston Lake
Original Construction
1960-1963
National ID Number
CA10165
Dimensions
Structural Height
91.00 ft
Crest Length
745.00 ft
Top of Active Conservation Pool (Elevation)
1902.00 ft
Top of Inactive Conservation Pool (Elevation)
1898.00 ft
Spillway Crest Elevation
1874.50 ft
Streambed at Dam Axis
1829.00 ft
Crest Elevation
1910.00 ft
Hydraulic Height (Normal Operating Depth at Dam)
73.00 ft
Top of Dead Storage Pool (Elevation)
1843.25 ft
Hydraulics & Hydrology
Spillway Capacity at Elevation
30000 cfs at 1902.0 ft
Outlet Works Capacity at Elevation
325 cfs at 1902.0 ft
Drainage Area
25.6 sq mi
Normal Water Surface Elevation
1902.0 ft
Auxiliary Spillway
No
Hydrometeorological Report (HMR)
HMR 36
Net Generation
2,423,000 kWh
Contact
Owner
Title: Area Office Manager Organization: Northern California Area Office Address: 16349 Shasta Dam Boulevard City: Shasta Lake, CA 96019 Phone: 530-247-8500
Operator
Title: Area Office Manager Organization: Northern California Area Office Address: 16349 Shasta Dam Boulevard City: Shasta Lake, CA 96019 Phone: 530-247-8500
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