Lake Hefner is an impoundment located in northwest Oklahoma City. It was built in 1947 and serves as one of Oklahoma City’s water reservoirs. The lake receives water through a canal on the southwest side that brings water from the North Canadian River at the northeast margin of Lake Overholser.

Lake Hefner covers 2,500 acres with an average depth of 29 feet. A bicycle ride or walk around the lake is a distance of about 11 miles. The 3-mile dam is located along the north side of the lake, somewhat parallel to Hefner Road, between Hefner Parkway and MacArthur with one-way, east-bound car traffic and a walking/bicycling lane. The deepest water (94′) is along the dam. The dam, most of the west side and all of the east side of Lake Hefner are a rock revetment. The most consistent mud flats are located along the southwest corner.