Middle River County Park is located 1 mile south of Winterset on County Road P-71 with the entrance of the park directly across the highway from the Board’s Operations Center.

Middle River Park, located on the south edge of Winterset, is managed as a recreational area that provides users with picnic and shelter facilities, river access to Middle River and a hard-surfaced trail system. Middle River Park is 80 acres of primarily woodlands made up of giant Cottonwood, Hackberry, Silver Maple and Walnut trees that grace the lower picnic grounds and two-level shelter facility, gradually giving way in the upper elevations to beautiful stands of native Black Maples and eventually Oak/Hickory forests. Middle River Park adjoins the larger Winterset City Park, with the parks connected by a trail converted from an abandoned road.