Ackley Lake State Park is a public recreation area located four miles southwest of Hobson, Montana.

[2] The park is operated by the Montana Department of Fish, Wildlife and Parks on land leased from the Montana Department of Natural Resources and Conservation.

[5] The Ackley Lake was originally a 40-acre natural pond owned by Jean Acley.

The reservoir is an off-stream storage project with a supply canal from the Judith River.

[3] It was threatened with the loss of its status as a state park after the Montana State Parks and Recreation Board adopted a five-year strategic plan, "Charting a New Tomorrow," that proposed a rebranding of the parks in its system.