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?
Rainbow Bridge used to have its own marina - with gas and convenience services at a dock just around the corner from the bridge itself. Eventually it was decided the channel was too narrow, and the marina was moved to Dangling Rope Canyon, about 12 miles away.