Reservoir Levels Weather Hydrology

Lake Mendota is a glacial lake located in Madison, Wisconsin with a surface area of 9,842 acres. The lake is over 450ft deep and is a popular location for fishing, ice skating, and water sports. The lake's hydrology is heavily influenced by precipitation, snowpack, and surface run-off from the surrounding land, which is primarily agricultural. The Yahara River is the primary surface flow provider and is responsible for over 90% of the water entering the lake. The lake has a rich history, with Native American tribes inhabiting the area for thousands of years before European settlement. In the early 20th century, the lake was heavily polluted, but efforts to reduce agricultural runoff and sewage have improved its water quality. Lake Mendota remains an important resource for fishing, recreation, and research in Wisconsin.

June 25, 2024







Gage Height, Ft 24hr Change 1.87%
Percent of Normal 110%
Minimum 7.32 ft
Maximum 12.36 ft
Average 10 ft
Dam_Height 16
Hydraulic_Height 5
Drainage_Area 254
Years_Modified 1959 - Other
Year_Completed 1849
Nid_Storage 160000
Hazard_Potential High
Structural_Height 16
Primary_Dam_Type Other
River_Or_Stream YAHARA RIVER
Surface_Area 9730
Dam_Length 100
Length_Of_Locks 102
Nid_Height 16

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