Reservoir Levels Weather Hydrology

Diablo Reservoir is a man-made lake located near Newhalem, WA in the North Cascades. The reservoir was created in 1930 to generate hydroelectric power for the city of Seattle. The hydrology of the lake is heavily influenced by the Skagit River, which feeds into the lake. Specific surface flow comes from the Skagit River, as well as several smaller creeks and streams in the area. The reservoir is also a major provider of snowpack, which is critical for maintaining water levels during the dry summer months. The water from Diablo Reservoir is primarily used for hydroelectric power generation, but it also supports local agriculture and recreational activities such as fishing, boating, and camping. The surrounding wilderness is home to a variety of wildlife, including bears, mountain goats, and bald eagles.

June 13, 2024







Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change -0.03%
Percent of Normal 100%
Minimum 1,193.5 ft
Maximum 1,204.8 ft
Average 1,201 ft
Dam_Height 389
Hydraulic_Height 335
Drainage_Area 1160
Year_Completed 1929
Nid_Storage 89200
Structural_Height 389
River_Or_Stream Skagit River
Primary_Dam_Type Concrete
Foundations Rock
Surface_Area 770
Hazard_Potential High
Outlet_Gates Tainter (radial) - 19
Dam_Length 1180
Nid_Height 389

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