From the record
“The Rock Harbor Lighthouse is a light station located in Rock Harbor on Isle Royale National Park, Michigan. It was listed on the National Register of Historic Places in 1977.”
Wikipedia article Rock Harbor Light, CC BY-SA 4.0.
One of 31 National Register listings published here for Keweenaw County · listed in 1977 · category: Building · built in 1855.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

