Onion Creek to Castle Valley — Fisher Towers Back Road

Onion Creek Road off Utah Route 128 east of Moab looks innocent from the highway — a gravel track threading into a narrows between brick-red canyon walls. Then the creek crossings start. You’ll ford Onion Creek roughly eighteen times in three miles, the water laced with selenium that stains the rocks an otherworldly orange and white. The canyon walls tighten and the colours get stranger — purple mudstone, cream sandstone, rust iron staining bleeding down every face. Pop out on top and the Fisher Towers rise to the east: 900-foot spires of Cutler Formation sandstone that look like they were sculpted by someone who’d never seen a mountain. Drop to the Colorado River via the Thompson Canyon connector and you’re back on pavement at Castle Valley.

Moderate difficulty — this isn’t a locker trail, but the creek crossings demand at least a stock 4WD with solid ground clearance to avoid washing silt into your brakes and driveline. Check flow levels before you commit; flash flood risk is real in this canyon. Spring and fall are the call — summer heat in the canyon is punishing and creek levels can spike fast. No permit required. Camp at Onion Creek dispersed sites off 128. Moab is 23 miles west for fuel and supplies.