Reservoir Levels Weather Hydrology

Lake Chelan is a natural lake located in Chelan, Washington, and is approximately 50.5 miles long. The lake was formed over 10,000 years ago by a glacier and has a maximum depth of 1,486 feet. Lake Chelan is fed by several streams, including the Stehekin River, and is the main source of water for the surrounding area. The lake's hydrology is unique, as it is considered a closed basin, meaning it has no outlet to the sea. The lake's surface flow is regulated by the Chelan River Dam, which produces hydroelectric power. Snowpack providers for the lake are the North Cascades and the Chelan Mountains. The lake supports agricultural activities, including fruit orchards and vineyards. Recreation activities, such as boating, swimming, and fishing, are also popular in the area.

May 21, 2024







Elevation Of Reservoir Water Surface Above Datum, Ft 24hr Change 0.01%
Percent of Normal 100%
Minimum 1,082.68 ft
Maximum 1,100.04 ft
Average 1,093 ft
Dam_Height 33
Hydraulic_Height 57
Drainage_Area 952
Year_Completed 1927
Nid_Storage 676100
Structural_Height 66
Primary_Dam_Type Gravity
Foundations Rock, Soil
Surface_Area 32980
Outlet_Gates Slide (sluice gate) - 1, Tainter (radial) - 8
River_Or_Stream Chelan River
Dam_Length 490
Hazard_Potential Significant
Nid_Height 66

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Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second