Presque Isle Harbor, Michigan is located on the south shore of Lake Superior at Marquette, Michigan. It is an indentation about 1.5 miles long and one-half mile wide in shore behind Presque Isle Point. The project was authorized by Rivers and Harbors Acts of June 3, 1896; June 13, 1902; August 30, 1935; and, July 14, 1960. The existing project
provides for a breakwater 2,816 feet long off Presque Island and the dredging of a maneuvering area of irregular shape, the inner basin of which is to be 28 feet deep and the approach 30 feet deep. The project serves iron ore (taconite) and coal facilities.