U.S. Highway 91
U.S. 91 used to follow the Interstate 15 corridor from San Bernardino, California, all the way north to Sweetgrass, Montana. Today, U.S. 91 is all but gone -- there are still a few miles left near the Utah-Idaho border. U.S. 91 lasted from 1926 through 1974. In Nevada, U.S. 91 was replaced by I-15, but the historic route is available along:
- Nevada 604 from Jean to North Las Vegas via the Las Vegas Strip and downtown
- Nevada 170 through Bunkerville
- Nevada 144 through Mesquite (Business Loop 15)
Along locally-maintained Old U.S. 91 that goes around the Virgin River Gorge to the northwest rather than through the gorge between Mesquite and St. George
Many old alignments of U.S. 91 parallel the Interstate 15 freeway corridor too, many of which are visible at the myriad exits from Interstate 15.
U.S. 91 used to have an alternate route along Main Street in Las Vegas. Signed as Alternate U.S. 91, this highway is today known as Nevada 601.
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