Overflow from drained wetlands in the watershed after heavy rains in the early 1980's filled Lake Thompson. After being nearly dry ever since settlement 100 years ago, the lake rose to depths of 24 feet deep, flooding 8,000 acre of adjacent privately owned land. Today, the lake is actually a marsh located immediately east of De Smet on the north side of Highway 14. Lake Herman - A good place to witness the migration of snow geese or, on the east side, to camp in the State park. Drive 2 miles west of Madison, on Highway 34.
Lake is on the south.
Headquarters, WMD - Located just off Highway 19, about 3 miles southeast of Madison. Visitors are welcome. The Waterfowl Production Areas of the District are popular spots for wildlife observation, hunting, fishing, and picnicking. Limited interpretive facilities are available at the District Headquarters and at the nearby Madison Waterfowl Production Area. Wildlife observers will find a rich variety of animal and plant life.