Dewey's Pasture Access provides entry to a 5,390-acre prairie pothole complex designated as a Registered Natural Landmark, featuring multiple hiking trails including a 3+ mile mowed loop through Lost Island Marsh and a one-mile forest loop accessible from Lost Island Nature Center in Huston County Park.

The main parking lot is located off B 17 (300th Street) about 4 miles north of Highway 18 between Spencer and Ruthton, with restrooms available at the nearby park facilities and support for kayaking, canoeing, and fishing activities.