Today we took a 100 mile round trip by boat to the famous Rainbow Bridge - the greatest of the world's known natural bridges. Our captain (Richard) was very informative and was well impressed with our itinerary, especially the fact that we were going to Moab – his favourite place!
Rainbow Bridge
Rainbow Bridge was known for centuries by the Native Americans who lived in the area. Native Americans living in the region have long held the bridge sacred. Ancestral Pueblo residents were followed much later by Paiute and Navajo groups. Several Paiute and Navajo families, in fact, still reside nearby.
By the 1800s, Rainbow Bridge was also surely seen by wandering trappers, prospectors, and cowboys. Not until 1909, though, was its existence publicized to the outside world. Two separate exploration parties-one headed by University of Utah dean, Byron Cummings, and another by government surveyor, W.B. Douglass-began searching for the legendary span.
Eventually, they combined efforts. Paiute guides Nasja Begay and Jim Mike led the way, along with trader and explorer, John Wetherill.
Late in the afternoon of August 14, coming down what is now Bridge Canyon, the party saw Rainbow Bridge for the first time.
The next year, on May 30, 1910, President William Howard Taft created Rainbow Bridge National Monument to preserve this "... extraordinary natural bridge, having an arch which is in form and appearance much like a rainbow, and which is of great scientific interest as an example of eccentric stream erosion."
Even Mr President had something to say about this wondrous formation:
"Next morning early we started our toilsome return trip. The pony trail led under the arch. Along this the Ute drove our pack-mules, and as I followed him I noticed that the Navajo rode around outside. His creed bade him never pass under an arch. "
Theodore Roosevelt, after 1913
Geology
The rock formations which comprise Rainbow Bridge are hundreds of millions of years old, deposited in a time when the climate and terrain were very different from what they are today. The base of Rainbow Bridge is composed of Kayenta Sandstone, reddish-brown sands and muds laid down by inland seas and shifting winds over 200 million years ago.
The bridge itself is composed of Navajo Sandstone - this slightly younger formation (about 200 million years old) was created as wave after wave of sand dunes were deposited over an extremely dry period which lasted millions of years.
These dunes were deposited to depths of up to 1000 feet (305 meters).
Over the next 100 million years, both of these formations were buried by an additional 5000 feet (1,524 meters) of other strata.
The pressures exerted by the weight of all these materials consolidated and hardened the rock of these and other formations in this region.
Other Facts
From its base to the top of the arch, Rainbow Bridge is 290 feet tall (nearly the height of the Statue of Liberty!)
It spans 275 feet across the river.
The top of the arch is 42 feet thick and 33 feet wide.
Temperature: 86F
Duration: 7 Hrs 25 Mins
From its base to the top of the arch, Rainbow Bridge is 290 feet tall (nearly the height of the Statue of Liberty!)
It spans 275 feet across the river.
The top of the arch is 42 feet thick and 33 feet wide.
Temperature: 86F
Duration: 7 Hrs 25 Mins


