The most visited part of the Grand Canyon is called the Corridor. It is about a twenty-mile wide strip extending across the Canyon from the North Rim to the South where most of the Park's development is concentrated. At the bottom of the Canyon are two bridges, the oldest built in 1928 is the Black Bridge or Kaibab Bridge. Previous to the construction of this bridge, the only way across the Canyon was by a cableway, that is, a cable suspended over the river with a large metal cage, large enough to carry one mule or a couple of people at a time. The Kaibab Bridge's construction posed extreme difficulties since all of the materials for the bridge had to be carried down into the Canyon either by mules or human power. The one-ton 550-foot suspension cables were carried down into the Canyon on the backs of 42 Havasupai Indians walking single file down the trail. See ASU nature, culture and history at the grand canyon.
In the 1960s a second bridge, the Silver Bridge, was built across the Canyon connecting the North Kaibab Trail with the Bright Angel Trail. This second bridge is open only to foot traffic but also carries the vital water pipe line from Roaring Springs where the water is then pumped up the Canyon to the South Rim.
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