Great Plains State Park, State park in Mountain Park, Oklahoma, US.

Great Plains State Park is a state park situated on the eastern shore of Tom Steed Lake beneath the Wichita Mountains in Oklahoma. The park spans rocky terrain and provides numerous recreation areas, boat access points, and trail systems throughout its grounds.

The park preserves ruins of the Gold Bells Mill and Mine dating to 1904, which operated as part of a small mining community called Wildman. The town eventually vanished, leaving only these structures as reminders of the area's early mining past.

The park lies between the Wichita Mountains and Tom Steed Reservoir, a lake with 31 miles of shoreline. Its campground covers about 460 acres, with 56 RV hookups and 30 tent sites. Visitors can swim at the beach, use the boat ramps, picnic, and ride cycling and mountain biking trails.

Visitors can reserve campsites equipped with full hookups for RVs and access boat ramps for water recreation. The park provides restrooms, picnic areas with grills, and parking throughout its grounds for both day visitors and overnight guests.

The park's developed area covers about 487 acres, but the full property runs more than 1,200 acres from end to end, with the campground alone taking up roughly 460 acres. It sits on the shores of Tom Steed Reservoir, whose 31 miles of shoreline border the park.