Might this more transient, ephemeral type of structure even be the way of the future? These bridges are based on traps. There is an elevation difference of 3,610 feet (1,100 mtrs) between the Skywalk and the river though the vertical height of the Skywalk is only 720 feet (219 mtrs) above the plateau directly below it.  The privately financed $750,000 structure was originally a toll bridge; the tolls were eliminated in April 1940 after the bridge was purchased by the state of Idaho for $482,000.. Inca rope bridges are simple suspension bridges over canyons, gorges and rivers constructed by the Inca Empire.  The new bridge was dedicated on July 31, 1976; the original cantilever bridge to the west was later disassembled. Image by Eric Sakowski / HighestBridges.com, http://www.highestbridges.com/wiki/index.php?title=Grand_Canyon_Skywalk. Navajo Bridge served the area well for 66 years. This page was last modified on 20 July 2013, at 10:59. In Portland, Oregon there is an unusual 150 foot (46 meter) high cable stay supported bridge / corridor that connects the VA Medical Center with the Oregon Health Sciences University. ELI5: How are rope bridges/ziplines across canyons or deep valleys built? Opened in 2007 on the Hualapai Indian Reservation about 120 miles (193 km) from Las Vegas, the unique U-shaped “glass bridge” is a partially enclosed walkway that cantilevers 70 feet (21 mtrs) out above a 720 foot (219 mtr) high cliff. A bridge site was selected 5 miles (8km) downriver at Marble Canyon. People had to travel 800 miles (1287km) around the canyon to reach the other side of the river. Part of the bridge's strength and reliability came from the fact that each cable was replaced every year by local villagers as part of their mit'a public service or obligation. The first three days are dedicated to the construction of the bridge, while the final day – the second Sunday in June – features typical music and dances and also allows visitors the opportunity to walk across the completed bridge. Or perhaps you'd fancy an in-depth account of a visit to Q'eswachaka? It was recognized that it was time to find a safer, more reliable way for vehicles to cross. The structure can withstand an 8.0 earthquake and is supported on tuned mass dampers to reduce normal vibrations from the wind and people. (optional), Not only an awesome video, the first 40 seconds shows an accurate depiction, http://www.youtube.com/watch?v=fdJc1_IBKJA, I'm no archer, but I'm guessing it'd be pretty far-fetched to think that you could fire a normal arrow from a normal compound bow THAT far without the cord dragging the arrow down. The historic bridge would remain and serve as a pedestrian bridge and provide visitors with a breathtaking view of the Colorado River 467 feet (142m) below.
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