Dewey's Pasture Complex Access provides boat ramp access to a 5,390-acre prairie pothole complex designated as a Registered Natural Landmark and Bird Conservation Area, offering excellent opportunities for paddling and fishing.

The main parking area is located off Highway B17 (300th Street) about 4 miles north of Highway 18 between Spencer and Ruthven, with GPS coordinates N43°11. 570 W94°55. 812.

The complex features multiple access points including boat ramps, a 3+ mile mowed loop hiking trail through Lost Island Marsh, and a one-mile forest loop trail, with restrooms and facilities available at the nearby Lost Island Nature Center in Huston County Park.