Though its "discovery" by the outside world was only a hundred years ago, American Indians have known about Rainbow Bridge for centuries. It is also quite likely that prospectors, ranchers, and others happened across the bridge in their wanderings.
The story of the official recorded discovery of Rainbow Bridge is an interesting one. Click on the link above to read about this modern day exploration party.
Did You Know?
From Glen Canyon National Recreation Area, the only access to Rainbow Bridge is by boat. The trip is about 50 miles from the Wahweap or Bullfrog marinas.