U.S. Route 91
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| Route information | |
| Length: | 172.663 mi (277.874 km) |
| Existed: | 1926 – present |
| Major junctions | |
| South end: |
  I-15 / I-84 in Brigham City, UT
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 US-89 in Logan, UT US-30 in McCammon, ID I-86 in Pocatello, ID
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| North end: |
  I-15 Business Loop / US-26 in Idaho Falls, ID
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| Location | |
| States: | Utah, Idaho |
| Highway system | |
U.S. Route 91 (US 91) is a north–south United States highway. The highway currently serves as a connection between the Cache Valley area of Utah and Idaho to the Salt Lake City and Idaho Falls population centers. Prior to the mid-1970s, US 91 was an international commerce route from Long Beach, California to the Canada–US border north of Sweetgrass, Montana. US 91 was routed on the main streets of most of the communities it served, including Las Vegas Boulevard in Las Vegas and State Street in Salt Lake City. From Los Angeles to Salt Lake, the route was built along the corridor of the Arrowhead Trail. US 91 has been largely replaced by Interstate 15. A portion of the highway's former route in California is currently State Route 91.
U.S. 91 begins at Brigham City and winds its way through the Wellsville Mountains using Box Elder and Wellsville Canyons for its path to the Cache Valley, concurrent with U.S. 89. Along the way it passes Mantua and Mantua Reservoir and crosses over Sardine Summit. Once entering Cache Valley it serves as the major thoroughfare of the valley. Logan is the largest city in the valley. Both the Utah and Idaho portions of Cache Valley are part of the Logan Utah Metropolitan Statistical Area.
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Wikipedia