I hoped to do this drive on my way back. The Old Spanish Trail Association (OSTA) website (oldspanishtrail.org) Where Upper Bear Valley Rd meets Utah Highway 20.describes the Old Spanish Trail as “the most arduous and difficult trail in the United States.”​ One arm of the trail – the Armijo Route – passes just east and north of Page, and closely follows portions of Highway 89 across southern Utah between Big Water and Kanab.