From the record
“The Chamberlain Ranger Station Historic District, also known as the Chamberlain Guard Station, is located in the Frank Church-River of No Return Wilderness within Payette National Forest in Idaho County, Idaho. It was listed on the National Register of Historic Places in 2004.”
Wikipedia article Chamberlain Ranger Station Historic District, CC BY-SA 4.0.
One of 42 National Register listings published here for Idaho County · listed in 2004 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service