Reservoir Levels Weather Hydrology

Wynoochee Lake is a reservoir located near Grisdale, Washington. The lake was created in 1961 by the construction of the Wynoochee Dam on the Wynoochee River. The dam was built to provide hydroelectric power, flood control, and irrigation water. The lake has a capacity of 120,000 acre-feet and provides water to the Chehalis River Basin for agriculture and municipal uses. The hydrology of the lake is influenced by both surface flow and snowpack. The lake is surrounded by the Olympic National Forest and is a popular destination for recreational activities such as fishing, boating, hiking, and camping. The lake is also home to several species of fish, including rainbow trout, cutthroat trout, and kokanee salmon.

June 16, 2024







Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0%
Percent of Normal 100%
Minimum 735.92 ft
Maximum 799.99 ft
Average 794 ft
Dam_Height 175
Hydraulic_Height 170
Drainage_Area 41
Year_Completed 1972
Nid_Storage 76000
River_Or_Stream Wynoochee River
Structural_Height 175
Foundations Rock
Surface_Area 1126
Hazard_Potential High
Outlet_Gates Slide (sluice gate) - 2, Tainter (radial) - 2
Dam_Length 1700
Primary_Dam_Type Gravity
Nid_Height 175

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