The Gros Cap Reefs Light is a lighthouse located at the entrance to St. Mary's River from Whitefish Bay of Lake Superior. The light was completed in 1953 and replaced a lightship stationed there since 1923. The lighthouse, owned by the Canadian Coast Guard, is located on the southwest edge of the Gros Cap Reef. The opening of this aid to navigation resulted in the deactivation of the Point Iroquois Light in 1962.