Descriptive name given in 1944 by W. W. Patton, U.S. Geological Survey (USGS), during the exploration of Naval Petroleum Reserve No. 4; because of its fortress appearance.
Fortress Mountain, Horseshoe Mountain,
Mountain Passes:Mountain Ranges:Streams:Canoe Creek, Chert Creek, Fire Creek, Fortress Creek, Monotis Creek, Notch Creek,