Thompson Road Off-highway vehicle access to Thompson (on Interstate 70), Yellow Cat, Utah historic mining area and Salt Valley Road into Arches National Park, Utah. Utah Highway US 191 is southeastern Utahs main artery, interlinking beautifully sculpted canyons, breathtaking red rock formations, majestic snow-capped mountain peaks, rugged and colorful high desert beauty, geological treasures, mysterious prehistoric ruins and rock art, historic sites, a myriad of recreational opportunities and old-fashioned western hospitality.