U.S. Route 191
is a spur of
that has two branches. The northern branch currently runs for 440
miles (708 km) from Loring, Montana,
at the Canadian border
to the northern part of Yellowstone National Park. The southern branch currently runs for 1,465
miles (2,358 km) from the southern part of Yellowstone
National Park to Douglas, Arizona, on the Mexican
There is an implied route through Yellowstone
National Park to connect the two branches. The highway passes
through the states of Montana, Wyoming, Utah, and
Although the highway was first formed in 1926, its routing has
changed drastically through the years. The modern US 191
bears almost no resemblance to the original route, which was
primarily in the state of Idaho.
of the current route of US 191 was formed in 1981.
begins near the Mexico border in
Douglas.US 191 has a layover with US
70 east of Safford.
route links to AZ 366
to the south of
Safford. US 191 intersects Interstate 10 in Cochise
County.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.
This is a very dangerous
mountain road with many sharp curves and little or no shoulders on
steep cliffs. The highway is the primary route to access
Canyon de Chelly National
US 191 traverses the Navajo Nation
before entering Utah.
US 191 serves the eastern half of the state. The road enters Utah
in a remote portion of the Navajo
. The highway passes through mostly desolate
areas of eastern Utah.
Several portions are National
or Utah Scenic Byways
. In addition to linking
many rural towns in Utah to Interstate 70
and U.S.Route 40
, the highway served to
interconnect several national and state parks for tourism.
highway exits Utah just after crossing the Flaming
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
This segment of the route is known locally
as "East Flaming Gorge Road."
The route is then concurrent
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
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 than 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.
Jackson, US 191 soon enters Grand Teton National Park, running concurrently with US 26 and US
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, and then enters Yellowstone
National Park at the park's South Entrance.
routing of US 191 through Yellowstone has been designated.
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 eight miles (13 km) before veering
slightly east and re-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
Sky, before entering the Gallatin Valley near the town
Gateway, Montana.US 191 travels north and east through the
valley to the city of Bozeman.
Bozeman, with a 2000 census population of
29,459, is the largest city on the entire US 191 route.
Bozeman, US 191 is concurrent with Interstate 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
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.
of the three routes here is signed with a different compass
direction -- traveling towards Lewistown, US 191 is northbound, US
87 is southbound, and Montana 200 is eastbound.
reaches the Canadian Border after going through Lewistown, across the
River at the Charles M.Russell National Wildlife
Refuge, and through Malta.Its northern terminus at the international
border is called Port Morgan, and the road continues into Canada as
Saskatchewan Highway 4,
original route designated in 1926 ran from Idaho Falls,
Idaho, to West Yellowstone, Montana along the route now numbered U.S.Route
. The routing of US 191 has drastically changed through the
years having been extended and shortened several times. West
Yellowstone is the only town that has been continuously served by
the highway since its commissioning. As US 191 has mostly been
extended while US 91 has largely been truncated, US 191 is now ten
times longer than its parent.
time US 191 connected to its parent, US
91, twice: at Idaho Falls, Idaho and Brigham City, Utah.
Today the highway does not connect to its
parent, or even enter Idaho. In Utah, there have been 2 completely
different iterations of U.S. 191 serving different areas of the
state. The original iteration is now State Route 13
, which is mostly a
for Interstate 15
By 1981, due to the construction of Interstate 15
and extension of other U.S.
designations, US 191 had been truncated to a route between West
Yellowstone and Malta,
Montana.Utah and Wyoming lobbied
AASHTO to create a single highway that would
connect several National Parks in
their states to facilitate tourism.
The initial proposal was
to extend U.S.Route 163
north into Wyoming. However it was later
decided to add Arizona to this
proposal for a new highway and instead extend US 191
Most of the southern extension recycled existing U.S.
and state highways. However, some new sections were constructed.
When the 1981 extension was finished, US 191 reached Interstate 40
In Wyoming, the new US 191 absorbed what was
U.S.Route 187, formed in 1926
as a branch from US 87W (now US 287) at Jackson Lake Junction,
Wyoming south to US 30 in Rock
Although it became part of US 191 in 1981,
American Association of State Highway and Transportation
still lists it in their latest log (1989), with a
short independent section in Rock Springs between former US 30 (now
) and I-80
combination of new construction and the upgrading of county roads
created a more direct route between Interstate 80 in Wyoming and
Through Utah, US-191 absorbed SR-33
, and most of
. From Crescent Junction to Bluff was
previously numbered U.S.Route 163
, eliminating all but a short
segment of that route.
route was constructed for US 191 from Bluff, Utah to a junction with U.S.Route
in Arizona.The 1981 extension caused US 191 to enter Arizona
for the first time in its history. Between US 160 and I-40 the
highway absorbed the route of former State Route 63
Arizona requested a
new number for its portion of U.S.Route
, arguing the road signs on this highway were the most
frequently stolen in the state. As a result, US 191 was extended again to
the Mexican border at Douglas, Arizona.In 1996 it became the latest U.S. highway to
run from border to border, with the extension from Malta,
Montana to the Canadian border, absorbing former
Montana Secondary Highway 242.In 2003 New Mexico asked AASHTO to renumber its
portion of US 666.
This time all of then US 666 was
renumbered U.S.Route 491, the x91 number was decided because
the road meets US 191 in Monticello, Utah.