From the Highway 24 junction, the Temple of the Moon is 17.1 miles up Cathedral Road. The full Cathedral Valley loop is 57.6 miles and usually takes six to eight hours. High clearance is required. Rain, snow or flooding can make the dirt roads impassable, even for four-wheel drive, so check current park road conditions before setting out. The eastern approach on Cathedral Road avoids the Fremont River ford; the Hartnet approach includes an unbridged ford. Bring your own food, water, fuel and emergency supplies: there is no potable water in Cathedral Valley, and help may take hours or days.