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Old Mill State Park
Descriptions of Selected Resources

Minnesota state parks contain a variety of historic properties. These images are representative of the Rustic Style historic resources built in Minnesota state parks.

Old Mill State Park Diversion Dam

Diversion Dam
Builder: WPA
Architect: H. Petersen
Date: 1939

The Diversion Dam was constructed across the Middle River to provide an adequate supply of water for the nearby swimming beach. The structure consists of a 60'-wide spillway flanked by two sixteen-foot-square masonry abutments that rise eight feet from the dam. Each abutment features an overlook with 2'10" sidewalls constructed with masonry and 6" to 8" log posts and rails. A 14" shear gate in the east abutment leads to the artificial lake. The Diversion Dam was constructed according to the specifications of the Division of Drainage and Waters.