Huron Lightship Museum at Pine Grove Park, was the last lightship on the Great Lakes and is now open to the public from April through mid-December. Contact the museum for specific times and hours of operation. Lightships were like floating lighthouses anchored in areas where it was too deep, expensive or impractical to construct a lighthouse. Huron lightship was stationed at various shoals on Lake Michigan until 1935 when she was transferred to Corsica Shoals in Lake Huron. For the next 36 years she guided mariners into the narrow dredged channel of lower Lake Huron leading to the St. Clair River . Memorial Day to Labor Day open seven days - 11am to 5pm, September through November Thursday through Monday, April through May Thursday through Monday, December through March. Closed Thanksgiving, Christmas Eve, Christmas Day, New Years Day.