Manistique Harbor, Michigan is located on the north shore of Lake Michigan, 135 miles northeasterly from Green Bay Harbor, WI, and 220 miles northerly from Milwaukee, WI. The project was authorized by Rivers and Harbors Acts March 3, 1905 and March 2, 1907. The existing project provides for a breakwater protected entrance channel in Lake Michigan, a channel in the Manistique River, and a pier at the river mouth. Project depths are 19 feet in the outer portion of the entrance channel, 18 feet in the inner portion of the entrance channel, and 18 feet in the river channel. The harbor services primarily recreational navigation interests although a petroleum dock exists.