Check the Tooele Co page in the database section, here on RadioReference. Dugway has it's own system, and the Utah Test and Training Range(s) (UTTR) has several sites in the County. UTTR is mostly P25 phase II.
Any particular interest, while out there?
Complete aeronautical information about Michael Army Airfield (Dugway Proving Ground) (Dugway Proving Ground, UT, USA), including location, runways, taxiways, navaids, radio frequencies, FBO information, fuel prices, sunrise and sunset times, aerial photo, airport diagram.