Waubay Lake is a premier fishing destination located southeast of Grenville in Day County, South Dakota. This expansive 15,000-acre natural lake features a distinctive splatter paint shape with hundreds of miles of shoreline, creating abundant fishing opportunities for anglers of all skill levels. With a maximum depth of approximately 31 feet and an average depth of 13 feet, Waubay Lake offers diverse underwater structure and habitat that supports a thriving fishery. The lake, once four separate bodies of water (North Waubay, South Waubay, Spring Lake, and Hillebrands), merged in the late 1990s due to rising water levels, creating the larger single lake that exists today. Managed by the South Dakota Game, Fish, and Parks Department, Waubay Lake has developed a well-deserved reputation as one of South Dakota's premier walleye fisheries while offering excellent opportunities for multiple other species.