Port Sanilac Harbor, Michigan is located on the west shore of Lake Huron, about 30 miles north of Port Huron, Michigan. The project was authorized by the River and Harbor Act of October 27, 1965. The existing project provides for a harbor of refuge protected by breakwater structures extending to 12-foot depth contour in lake; for dredging a harbor basin 10 feet deep; for dredging an entrance channel 12 feet deep; a 70-foot extension of the south breakwater; a 300-foot arm added to the north breakwater; and riprap placed at the lakeward side of the breakwater addition. The harbor services primarily recreational navigation interests.