This peak is not in the book.
This Flat Top Butte is located in Jerome County northeast of the junction of US-93/ID-25. The butte’s summit is a long North-South trending affair with numerous electronics installations. There is not much to recommend about this summit except for the view, which is expansive. USGS Falls City
Look at the topo map linked below to access the peak, as my attempt to use Google Maps found it to not be accurate. Good county roads will lead you to the road that climbs to the summit. The high point is at the South End of the summit area.