Hillsdale Lake is a reservoir located in the northwestern part of Miami County, in northeast Kansas and the central United States; it is approximately from Kansas City. The surface area of the lake is approximately , and the lake has a maximum depth of approximately .
Hillsdale Dam, impounding the Big Bull Creek to create the V-shaped reservoir, was completed in 1982 as a flood control project of the United States Army Corps of Engineers. Fix link* The reservoir has a normal storage capacity of 76,000 acre-feet. No hydroelectric power is generated by the earthen dam. Recreational facilities include Hillsdale State Park, opened in 1994.
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