Lake Thompson Recreation Area

Lake Thompson Recreation Area
Dry pasture in the 1930 and a 9,000-acre marsh by 1980, this lake is now over 20 feet deep from heavy rains and snowmelt from the mid-80s  It is a National Natural Landmark and is in northeast South Dakota.
Here is the Area website.   Phone 605.847.4893  Trail Map and Guide
Wheelchair AccessiblePark Tour Trail 1.25 miles