U.S. Route 89 is a north-south United States highway with two sections. The southern section runs for 848 miles (1,365 km) from Flagstaff, Arizona to the southern entrance of Yellowstone National Park. The northern section runs for 404 miles (650 km) the northern entrance of Yellowstone National Park to Montana. Prior to 1992 U.S. 89 was a Mexico to Canada border-to-border highway beginning at Nogales, Arizona.
U.S. 89 begins at Flagstaff, Arizona, the highway proceeds north passing near Grand Canyon National Park and through the the Navajo Nation. Near the Utah State Line the highway splits into U.S. 89 and U.S. 89A. The Alternate is the original highway, what is now the main highway was constructed in the 1960's to serve the Glen Canyon Dam. The two highways rejoin in Kanab, Utah.
The main branch passes over the Colorado River just south of the Glen Canyon Dam and Lake Powell near Page then enters Utah. The Alternate branch crosses the Colorado River at Navajo Bridge and proceeds to the North Rim of the Grand Canyon before entering Utah.
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