How are bridges built between canyons or over river rapids?

Let's assume you can send out an expedition that sooner or later will find itself on the opposite side of the gorge. Also, that you have a fairly good plan from the beginning, and a way to communicate (for instance, signal flags). read more

Let's build a rope suspension bridge. First, build a tower on each side. Say, a pair of tree trunks in an x. Next, build an anchorage on each side. This can be a stump or a big ass boulder. read more

Carrying two lanes, the bridge rises over 700 feet (210 m) above the river and was the highest arch bridge in the world at the time of its completion in 1959. " 2) Navajo Bridge Navajo Bridge "Navajo Bridge crosses the Colorado River 's Marble Canyon near Lee's Ferry in the US state of Arizona. It carries U.S. Route 89A. read more