From the record
“Clair Flats Front and Rear Range Light are two lighthouse structures situated off the southeastern tip of Harsens Island at Lake St.”
Wikipedia article St. Clair Flats Front and Rear Range Light, CC BY-SA 4.0.
One of 28 National Register listings published here for St. Clair County · listed in 1990 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

