Lake Francis Case is a 107-mile long, 102,000-acre Missouri River reservoir located in south-central South Dakota, extending from Big Bend Dam at Fort Thompson to Fort Randall Dam in Pickstown. With over 540 miles of shoreline and a maximum depth of 140 feet, Lake Francis Case is known as a walleye factory for its consistent walleye production. The reservoir sits in the prairie environment of the Northern Great Plains, where the surrounding vegetation is predominantly grassland. Steep, rugged bluffs and a narrow floodplain characterize this part of the Missouri River, known as the gorge of the Missouri. The lake experiences annual water level fluctuations, with drawdowns in the fall creating storage space for spring runoff. Lake Francis Case provides excellent recreational opportunities for area residents and out-of-state travelers, with activities including fishing, boating, camping, hunting, and wildlife viewing. The reservoir is accessible via Interstate 90, making it a popular destination for anglers throughout the Midwest.