Walter J. Hayes State Park is a public recreation area covering 654 acres (265 ha) on the southeast corner of Wamplers Lake in the Irish Hills region of the state of Michigan.

The park is traversed by Michigan Route 124 north of its intersection with US Highway 12.

[6][7] It originally comprised a 99-acre purchase by the state plus two donations of land which brought the park's size to some 200 acres.

[7] It was renamed in 1930[8] after the family of Michigan State Senator Walter J. Hayes made a donation of land with the stipulation that the name change take place.

[9] Michigan CCC camp SP1 was active in Hayes State Park from 1933 to 1935.