Historic Dewey Suspension Bridge Dewey Bridge, Utah constructed in 1916, is Utah's longest suspension bridge and, at the time of its construction, was the 2nd largest suspension bridge west of the Mississippi. Kokopelli's Trail, a 140 mile (Loma, CO - Moab, UT) dirt trail for mountain bikes, ATV's, motorcycles, horses and, occasionally, 4WD vehicles, crosses the Colorado River on the old Dewey Bridge. Upper Colorado River Scenic Byway Follow the mighty Colorado River through its beautifully carved redrock gorge and travel back 250 million years in time. If it all looks familiar, it may be that you recognize the scenery from several western movies and commercials.