The relatively small number of annual visitors to Rainbow Bridge National Monument
is certainly not due to the spectacular central attraction; the preserve contains one of the largest natural bridges on earth, spanning a beautiful red rock canyon along the south shore of Lake Powell
. Instead, visitors are restricted by the remote location and difficult access - the bridge can be reached overland by a hike of 13 miles over rough, exposed terrain in the Navajo reservation, but virtually all visitors arrive by boat, on tours which cost from around $125 per person, and take most of one day. Like many other features around the lake, including the famous slot canyons, the bridge is composed of Navajo sandstone; it measures 290 feet high and 275 feet across.
Rainbow Bridge - full description