From the record
“Fish Creek Dam in Blaine County, Idaho, is an aging multiple-arch concrete dam that has achieved historic status and now represents some threat to public safety, due to danger of it failing. It is listed on the National Register of Historic Places.”
Wikipedia article Fish Creek Dam, CC BY-SA 4.0.
One of 21 National Register listings published here for Blaine County · listed in 1978 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service