From the record
“Camp Senia is a district of historic cabins near Red Lodge, Montana. Five of the approximately 5 cabins were burned on July 29, 2008, during the Cascade Fire, a large forest fire.”
Wikipedia article Camp Senia Historic District, CC BY-SA 4.0.
One of 81 National Register listings published here for Carbon County · listed in 1988 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service