Located 6 miles SW of Lake Preston off US Hwy. 14Area sportsmen quickly discovered large number of sport fish that the lake produced, including walleyes, perch and northern pike. Today, fishing success on Lake Thompson is rumored to be second in the state only to the Missouri River.
Boat launching facilities include a double-lane ramp, a dock, toilet and paved parking lot. Two more boat-launching sites are available at a nearby lakeside use area, located 5 miles south of DeSmet on Hwy 25, then 3 miles east. These boat ramps provide access to both lake Henry and Lake Thompson.