From the record
“The Elk City Wagon Road-Vicory Gulch-Smith Grade Segment in the Nez Perce National Forest in Idaho County, Idaho, was listed on the National Register of Historic Places in 2001. It is located in the vicinity of Elk City.”
Wikipedia article Elk City Wagon Road-Vicory Gulch-Smith Grade Segment, CC BY-SA 4.0.
One of 42 National Register listings published here for Idaho County · listed in 2001 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service