Lake Francis Case

Lake Francis Case
Fort Randall Dam, with Lake Francis Case in the background
Lake Francis Case Show map of South Dakota Lake Francis Case Show map of the United States
Location	South Dakota, United States
Coordinates	43°03′35″N 98°33′43″W / 43.05972°N 98.56194°W / 43.05972; -98.56194
Type	Reservoir
Primary inflows	Missouri River, White River
Primary outflows	Missouri River
Catchment area	263,480 sq mi (682,400 km2)[1]
Basin countries	United States
Max. length	107 mi (172 km)[1]
Surface area	102,000 acres (41,000 ha)[1]
Max. depth	140 ft (43 m)[1]
Water volume	5,700,000 acre⋅ft (7.0 km3)[1]
Shore length1	540 mi (870 km)[1]
Surface elevation	1,355 ft (413 m)[2]
Settlements	Pickstown, Oacoma, and Chamberlain
1 Shore length is not a well-defined measure.

Lake Francis Case is a large reservoir impounded by Fort Randall Dam on the Missouri River in south-central South Dakota, United States. The lake has an area of 102,000 acres (410 km²) and a maximum depth of 140 ft (43 m).^[1] Lake Francis Case has a length of approximately 107 mi (172 km) and has a shoreline of 540 mi (870 km).^[1] The lake is the eleventh-largest reservoir in the United States and is located within the counties of: Charles Mix, Gregory, Lyman, Brule, and Buffalo. The lake stretches from Pickstown, South Dakota upstream to Big Bend Dam.

The reservoir is named for former United States Senator Francis Higbee Case, of South Dakota.^[3]