The 1,860-acre Lake Wilhelm is an angler's paradise. Anglers visit the park year-round, although ice fishing accounts for many of the larger fish caught in Lake Wilhelm. The large lake, abundant wetlands, old fields and mature forests provide a diversity of habitats that attracts wildlife in all seasons. Boats may use motors of 20 horsepower or less on the state park portion of Lake Wilhelm. There are four launches within the state park. Largemouth and smallmouth bass, walleye, northern pike and muskellunge are the typical warm water game fish in the lake. Bluegill, crappie, catfish, perch and sunfish are also abundant. A bait and fishing tackle concession is available at the marina. A total of 150 tables are available throughout the park. Boat launch areas 1, 2, 3, 4 and marina have improved roads, restrooms and sizeable picnicking facilities.