Northeast of Torrey, the Hartnet Road, or western half of the Cathedral Valley Loop, begins 11.7 miles east of the Visitor Center off Utah Hwy 24. In order to take this OHV route to Cathedral Valley, visitors must ford the Fremont River soon after leaving the highway, which may require a 4WD vehicle. The remaining 24 miles to the top of the loop afford expansive view of the Blue Flats and the South Desert. The northern end of the loop nears Thousand Lake Mountain, and the geology and topography change greatly with the subsequent gain in elevation. Conditions on the Hartnet road vary widely based on recent weather. At best, high clearance vehicles are recommended and visitors should check with the Visitor Center for the most current road information. Hartnet Road begins approx. 4 mi east of the park boundary on Hwy 24 and somewhat parallels Caineville Wash Road, it is not labeled on this map.
Overall, Hartnet Road is the 32nd most popular OHV & 4wd jeep trail of all 32 OHV routes in Utah.