From the record
“The Bishop Mountain Lookout, located near Island Park, Idaho, was created between 1936 and 1938 by the Civilian Conservation Corps (CCC) in the Caribou-Targhee National Forest. It was listed on the National Register of Historic Places in 1986, and its cabin is currently available as reserved accommodations through the United States Forest Service.”
Wikipedia article Bishop Mountain Lookout, CC BY-SA 4.0.
One of 14 National Register listings published here for Fremont County · listed in 1986 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service