This from our sister site GORP.com (more info at http://gorp.away.com/gorp/resource/us_national_forest/nm/nm_gila_2.htm): "The Catwalk is a national recreation trail that follows the path of a pipeline built in the 1890s to deliver water to the mining town of Graham. Metal walkways bolted to the sheer rock face penetrate the narrow canyon of Whitewater Creek - - a canyon used by both Geronimo and Butch Cassidy as a hideout. Signs warn of scorpions and rattlesnakes. At the end of the Catwalk, a swaying suspension bridge leads to a cavern ledge overlooking a monstrous waterfall."