Arizona US 191 begins in
Cochise County, Arizona at a signaled intersection with
Arizona State Route 80 (SR 80) and
Historic U.S. Route 80 (Historic US 80) near
Douglas. US 191 has a overlay with
US 70 east of
Safford. The route links to
State Route 366 (SR 366) and
SR 266 to the south of Safford. The route between
Springerville and
Morenci was designated a
National Scenic Byway and given the name of
Coronado Trail Scenic Byway, as this approximates the path taken by
Francisco Vásquez de Coronado between 1540 and 1542. US 191 has a detached business route in Arizona, running from
SR 80/
Historic US 80 in Douglas, along Pan American Ave to the US Customs/Immigration Port of Entry at the border with Mexico. Part of US 191 through the Navajo Nation is designated by the
Arizona Department of Transportation as the '''Tse'nikani Flat Mesa Rock Scenic Road'''.
Utah US 191 serves the eastern half of the state. The road enters Utah in a remote portion of the
Navajo Nation. The highway passes through mostly desolate areas of eastern
Utah. Several portions are
National or
Utah Scenic Byways. It passes through
Bluff,
Blanding,
Monticello (the seat of
San Juan County), and
Moab, the largest city in southeastern Utah and the seat of
Grand County. It connects with U.S. Routes 6 and 50 as it joins Interstate 70 going due west through the town of
Green River, home of the John Wesley Powell Museum. A few miles west of town it splits off with US 6 and continues north between the San Rafael Reef to the west and Book Cliffs to the east through Emery County. It then enters the historic coalfields of Carbon County, passing through
Wellington and
Price, the largest city in Eastern Utah, home to the USU Eastern Prehistoric museum, and historic
Helper, the main stop for Amtrak between
Provo, Utah and
Grand Junction, Colorado. In addition to linking many rural towns in Utah to
I-70 and
US 40, the highway served to interconnect several national and state parks for tourism, namely
Canyonlands National Park,
Arches National Park,
Bears Ears National Monument, and
Dead Horse Point State Park. The highway exits Utah just after crossing the
Flaming Gorge Reservoir.
Wyoming US 191 enters Wyoming near a geographical feature known as Minnie's Gap, just east of
Flaming Gorge National Recreation Area. The route proceeds north through rugged desert country following an alignment mostly constructed during the 1970s, to a junction with
Interstate 80 at Exit 99, just west of
Rock Springs. This segment of the route is known locally as "East Flaming Gorge Road." The route is then
concurrent with Interstate 80 eastward for approximately , passing just north of Rock Springs. US 191 diverges northward at Exit 104, following the former route of
US 187. Traveling through high desert country, the route passes through
Eden,
Farson, and
Pinedale before meeting
US 189 at Daniel Junction. Continuing north, the road traverses increasingly mountainous terrain, entering the
Bridger-Teton National Forest and passing through the small community of
Bondurant before descending through the narrow Hoback River Canyon to an intersection with
US 26 and
US 89 at Hoback Junction. The route then follows the
Snake River valley northward to
Jackson. US 191 is concurrent with US 189 between Daniel Junction and Jackson, and with US 26 and US 89 between Hoback Junction and Jackson. North of Jackson, US 191 soon enters
Grand Teton National Park, running concurrently with US 26 and US 89. The highway meets
US 287 at Moran Junction, inside the park; US 191, US 89, and US 287 are concurrent north of Moran, but the highways are not signed. Continuing through forested, mountainous country, the route passes through the
John D. Rockefeller Jr. Memorial Parkway before ending at the South Entrance of
Yellowstone National Park. While US 191 and other U.S. Routes are officially discontinuous through the park, some commercially produced maps show these highways running inside Yellowstone National Park itself along its unnumbered roads and across the Wyoming–Montana state line.
Montana US 191 in Montana begins at the West Entrance to Yellowstone National Park, at the edge of the town of
West Yellowstone. The highway heads north, running concurrently with US 287 for before veering slightly east and entering Yellowstone. US 191 continues northward through Yellowstone, traversing forested, mountainous terrain and briefly looping into the state of Wyoming, before leaving the park in the upper reaches of the
Gallatin River canyon. The route travels northward through the narrow canyon, past the resort community of
Big Sky, then entering the Gallatin Valley near the town of
Gallatin Gateway, Montana. US 191 travels north and east through the valley to the city of
Bozeman, which is the largest city along the entire US 191 route. From Bozeman, US 191 is concurrent with
I-90 eastward to
Big Timber, where it proceeds north. The road travels through hilly ranch country near the eastern edge of the
Crazy Mountains to
Harlowton, where US 191 is briefly concurrent with
US 12. North of Harlowton, US 191 is concurrent with
Montana Highway 3 for , to Eddie's Corner. US 191 proceeds eastward from Eddie's Corner to
Lewistown, on a roadway shared with
US 87 and
Montana 200, in a
wrong-way concurrency. US 191 reaches the
Canada–US border after going through Lewistown, across the
Missouri River at the
Charles M. Russell National Wildlife Refuge, and through
Malta. It ends at the international border at Port Morgan, and the road continues into Saskatchewan as
Highway 4 toward
Swift Current. ==History==