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

The site features multiple parking areas and a 3+ mile mowed loop hiking trail through Lost Island Marsh and around Mud Lake, with additional amenities including restrooms at the nearby Lost Island Nature Center.

This location offers excellent opportunities for both paddling and fishing, with access points available off Highway B17 approximately 4 miles north of Highway 18 between Spencer and Ruthven.