Reservoir Levels Weather Hydrology

Lake Tapps is a reservoir located near Sumner, Washington. Originally, it was created as a hydroelectric project in 1911, but eventually became a popular recreational destination as well. The lake is fed by the White River and is owned by the Cascade Water Alliance. The hydrology of the lake is managed by the alliance, and the water level is raised and lowered throughout the year to meet the needs of downstream water users. Surface flow and snowpack providers for the lake include the White River and the surrounding mountains. Lake Tapps is used for a variety of recreational activities, including boating, fishing, and swimming. The lake also serves as a source of irrigation for local agricultural businesses.

July 19, 2024







Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0%
Percent of Normal 100%
Minimum 499.25 ft
Maximum 542.54 ft
Average 542 ft
Hydraulic_Height 18
Drainage_Area 9.69
Year_Completed 1911
Nid_Storage 22000
Structural_Height 9
River_Or_Stream Diversion from White River
Primary_Dam_Type Earth
Foundations Soil
Surface_Area 2570
Hazard_Potential High
Dam_Length 280
Nid_Height 18

Regional Streamflow


Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second


Cubic Feet Per Second

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