U.S. 89A Review
At Bitter Springs, 60 miles north of Cameron, U.S. 89A branches off from U.S. 89, running north and providing views of Marble Canyon, the geographical beginning of the Grand Canyon. Like the Grand Canyon, Marble Canyon was formed by the Colorado River. Traversing a gorge nearly 500 feet deep is Navajo Bridge, a narrow steel span built in 1929 and listed on the National Register of Historic Places. Formerly used for car traffic, it now functions only as a pedestrian overpass.
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