Willmar Lake is a moderate-sized, shallow, and productive 636-acre lake located within the city limits of Willmar in Kandiyohi County, Minnesota. With a maximum depth of 14 feet and approximately 4.74 miles of shoreline, this aerated lake is part of the Hawk Creek Watershed. The lake is connected to Foot Lake via a navigable outlet channel, allowing fish movement between the two bodies of water. Willmar Lake features varied shoalwater substrates consisting mostly of sand, silt, muck, and rubble, with generally sparse submergent vegetation including sago pondweed, coontail, curly-leaf pondweed, and water moss. Emergent vegetation (cattails) is common near the outlet channel area, and blue-green algae blooms frequently occur during late summer months.