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U.S. Route 91 or U.S. Highway 91 (US 91) is a north–south
United States highway The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these h ...
running from
Brigham City, Utah Brigham City is a city in Box Elder County, Utah, Box Elder County, Utah, United States. The population was 19,650 at the 2020 United States Census, 2020 census, up from the 2010 figure of 17,899. It is the county seat of Box Elder County. It l ...
, to
Idaho Falls, Idaho Idaho Falls is the fourth most populous city in Idaho and the county seat of Bonneville County. It is the state's most populous city outside the Boise metropolitan area. As of the 2020 census, the population of Idaho Falls was 64,818.2020 Cen ...
, in the U.S. states of
Idaho Idaho ( ) is a landlocked U.S. state, state in the Pacific Northwest and Mountain states, Mountain West subregions of the Western United States. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington (state), ...
and
Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...
. Despite the "1" as the last digit in the number, US 91 is no longer a cross-country artery, as it has mostly been replaced by
Interstate 15 Interstate 15 (I-15) is a major Interstate Highway in the Western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Ca ...
. The highway currently serves to connect the communities of the
Cache Valley Cache Valley ''( Shoshoni: Seuhubeogoi, “Willow Valley”)'' is a valley of northern Utah and southeast Idaho, United States, that includes the Logan metropolitan area. The valley was used by 19th century mountain men and was the site of th ...
to I-15 and beyond. Prior to the mid-1970s, US 91 was an international commerce route from
Long Beach, California Long Beach is a coastal city in southeastern Los Angeles County, California, United States. It is the list of United States cities by population, 44th-most populous city in the United States, with a population of 451,307 as of 2022. A charter ci ...
, to the Canada–US border north of
Sweetgrass, Montana Sweet Grass is a census-designated place and unincorporated community in Toole County, Montana, United States, on the Canada–US border. It is the northern terminus of Interstate 15, an important route connecting western Canada, the western U ...
. US 91 was routed on the main streets of most of the communities it served, including
Las Vegas Boulevard Las Vegas Boulevard is a major road in Clark County, Nevada, Clark County, Nevada, United States, best known for the Las Vegas Strip portion of the road and its casinos. Formerly carrying U.S. Route 91 in Nevada, U.S. Route 91 (US 91), wh ...
in
Las Vegas Las Vegas, colloquially referred to as Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. The Las Vegas Valley metropolitan area is the largest within the greater Mojave Desert, and second-l ...
and State Street in Salt Lake City. From Los Angeles to Salt Lake, the route was built along the corridor of the Arrowhead Trail. A portion of the highway's former route in California is currently State Route 91.


Route description

;Utah US 91 begins at Brigham City. The highway was originally routed through Brigham City, but today runs on a southern bypass (locally designated 1100 South). The original routing is now State Route 90. In Brigham City, US 89 becomes concurrent with US 91. After leaving Brigham City, the highway begins to climb the
Wellsville Mountains The Wellsville Mountains are a mountain range in Box Elder and Cache counties in Utah, United States, that is part of the Wasatch Range. Description The range separates the Cache Valley from the Wasatch Front (Bear River Valley), as well as ...
. The entire grade across these mountains is colloquially called "Sardine Canyon". However, Sardine Canyon is the canyon originally used by the first settlers to mark a trail to
Cache Valley Cache Valley ''( Shoshoni: Seuhubeogoi, “Willow Valley”)'' is a valley of northern Utah and southeast Idaho, United States, that includes the Logan metropolitan area. The valley was used by 19th century mountain men and was the site of th ...
, so named as they used the litter from their lunch of
canned sardines Sardines (also known as pilchards) are a nutrient-rich, small, oily fish widely consumed by humans and as forage fish by larger fish species, seabirds and marine mammals. Sardines are a source of omega-3 fatty acids. Sardines can be canned, pickl ...
to mark the trail. A new route was constructed in the 1950s that uses the same mountain pass, Sardine Summit, as the old road, however follows different canyons down from the summit. Despite the modern route of US 91 no longer using Sardine Canyon, the name continues to be used by locals and news media alike in describing the traffic, weather conditions or scenery along the entire grade across the Wellsville Mountains. US 91 enters the Wellsville Mountains via Box Elder Canyon in a climb to the lake and town of
Mantua Mantua ( ; ; Lombard language, Lombard and ) is a ''comune'' (municipality) in the Italian region of Lombardy, and capital of the Province of Mantua, eponymous province. In 2016, Mantua was designated as the "Italian Capital of Culture". In 2 ...
, which has a reputation as a
speed trap Speed limit, Speed limits are enforced on most public roadways by authorities, with the purpose to improve driver compliance with speed limits. Methods used include roadside speed traps set up and operated by the police and automated roadside "s ...
. After passing the reservoir, the highway resumes climbing, using Dry Canyon to reach Sardine Summit. The highway descends through Wellsville Canyon and reaches the Cache Valley, where it serves as the major thoroughfare.
Logan Logan may refer to: Places * Mount Logan (disambiguation) Australia * Logan (Queensland electoral district), an electoral district in the Queensland Legislative Assembly * Logan, Victoria, small locality near St. Arnaud * Logan City, local gove ...
is the largest city in the valley. At Logan, US 89 splits off to the east towards Bear Lake, while US 91 continues north through the valley to the Idaho state line. Both the Utah and Idaho portions of Cache Valley are part of the
Logan metropolitan area The Logan Metropolitan Statistical Area, as defined by the United States Census Bureau, consists of two counties – one in Utah and one in Idaho, anchored by the city of Logan. As of the 2010 census, the MSA had a population of 125,442 (t ...
. The Utah section of US 91 is defined at Utah Code Annotated § 72-4-115(1). In addition, the segment south of the SR-142 intersection in
Richmond Richmond most often refers to: * Richmond, British Columbia, a city in Canada * Richmond, California, a city in the United States * Richmond, London, a town in the London Borough of Richmond upon Thames, England * Richmond, North Yorkshire, a town ...
is included in the National Highway System. ;Idaho US 91 continues serving the Idaho portion of the Cache Valley with Preston as the largest city. The highway passes by the
Bear River Massacre Site Bear River Massacre Site, near Preston, Idaho, is the site of the Bear River Massacre, in which a village of Shoshone Native Americans were attacked by the 3rd Regiment California Volunteer Infantry, California Volunteers on January 29, 1863. Esti ...
, a
National Historic Landmark A National Historic Landmark (NHL) is a National Register of Historic Places property types, building, district, object, site, or structure that is officially recognized by the Federal government of the United States, United States government f ...
, near Preston, and over the geologically significant
Red Rock Pass Red Rock Pass is a low mountain pass in the western United States in southeastern Idaho, located in southern Bannock County, south of Downey. It is geologically significant as the spillway of ancient Lake Bonneville. It is traversed by U. ...
, near
Downey Downey may refer to: People *Downey (surname) *Robert Downey Jr. Places *Downey, California, US *Downey, Idaho, US *Downey, Iowa, US Businesses * W. & D. Downey, photographic studio * Downey Studios, created out of a former Boeing plant Schools ...
. After leaving Cache Valley, the highway then crosses back to rejoin
Interstate 15 Interstate 15 (I-15) is a major Interstate Highway in the Western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Ca ...
. At
Pocatello Pocatello () is the county seat of and the largest city in Bannock County, with a small portion on the Fort Hall Indian Reservation in neighboring Power County, containing the city's airport. It is the principal city of the Pocatello metro ...
, US 91,
US 30 U.S. Route 30 or U.S. Highway 30 (US 30) is an east–west main route of the United States Numbered Highway System, with the highway traveling across the Northern U.S. With a length of , it is the third-longest U.S. Highway, afte ...
, and I-15 Business Loop separate from Interstate 15 and run concurrently, passing through a small portion of the
Idaho State University Idaho State University (ISU) is a Public university, public research university in Pocatello, Idaho, United States. Founded in 1901 as the Academy of Idaho, Idaho State offers more than 250 programs at its main campus in Pocatello and locations ...
campus. US 30 separates from US 91 near Pocatello's city hall at what was once the starting point of one of Idaho's first designated highways, the Yellowstone Park Highway. From this point the highway generally follows the original route of the Yellowstone Park Highway northeastward, until it reaches its terminus at its intersection with
US 26 U.S. Highway 26 (US 26) is an east–west United States Numbered Highway that runs from Seaside, Oregon, to Ogallala, Nebraska. When the U.S. Numbered Highway System was first defined, it was limited to Nebraska and Wyoming Wyoming ...
, south of
Idaho Falls Idaho Falls is the List of cities in Idaho, fourth most populous city in Idaho and the county seat of Bonneville County, Idaho, Bonneville County. It is the state's most populous city outside the Boise metropolitan area. As of the 2020 United St ...
.


History

At its peak, from 1947 to 1965, U.S. Route 91 extended from the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
at
Long Beach, California Long Beach is a coastal city in southeastern Los Angeles County, California, United States. It is the list of United States cities by population, 44th-most populous city in the United States, with a population of 451,307 as of 2022. A charter ci ...
, to
Coutts, Alberta Coutts ( ) is a village in southern Alberta, Canada that is a port of entry into the U.S. state of Montana. It is one of the busiest ports of entry on the Canada–United States border in western Canada. It connects Highway 4 to Interstate 15, ...
. Though a good portion of the highway fit the US highway numbering grid, overall, US 91's northern terminus was east of US 89, while its southern terminus was west of US 101. North of
Riverside, California Riverside is a city in and the county seat of Riverside County, California, United States. It is named for its location beside the Santa Ana River. As of the 2020 census, the city has a population of 314,998. It is the most populous city in th ...
, US 91 followed a route that would be largely paralleled by modern I-15 and I-215 where these routes did not completely supplant it. There are some parts where US 91/I-15 had divergent paths. The more southerly is from
Littlefield, Arizona Littlefield is an Unincorporated area, unincorporated community and census-designated place in Mohave County, Arizona, Mohave County, Arizona, United States, that is located in the Arizona Strip region. As of the 2020 United States census, 2020 ...
, to
St. George, Utah St. George or Saint George is a city in and the county seat of Washington County, Utah, United States. Located in southwestern Utah on the Arizona border, it is the principal city of the St. George metropolitan statistical area (MSA). The cit ...
, where the two routes took different paths through the
Arizona Strip The Arizona Strip is the part of Arizona lying north of the Colorado River. Despite being larger in area than several U.S. states, the entire region has a population of fewer than 10,000 people. Consisting of northeastern Mohave County and ...
. The more northerly and longer is the surviving portion of US 91 from Brigham City to Downey, where Interstate 15 follows an old route of
U.S. Route 191 U.S. Route 191 (US 191) is a north–south highway in the Western United States and a spur of parent route U.S. Route 91 that has two segments. The southern segment runs for from Douglas, Arizona on the Mexican border to the southern part o ...
. Utah first submitted a petition to
AASHTO The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test quality control, protocols, and guidelines that are used in highway design and construction through ...
to have the US 91 designation truncated in 1971. This petition was approved on June 21, 1971. However, the state did not take action until 1974. Utah officials co-ordinated a second petition with the transportation departments of California, Nevada and Arizona. In this unified petition officials in Utah proposed the number changeover take place in 1974. Nevada requested postponing the deletion of US 91 as Nevada expected to complete the last piece of
I-15 I15 may refer to: * Interstate 15, a north–south Interstate Highway in the United States of America * Polikarpov I-15, a Soviet fighter aircraft * I15 (band), a band * , of the Imperial Japanese Navy * Älvsborg Regiment The Älvsborg Regiment ...
in 1975. Nevada officials suggested
U.S. Route 40 U.S. Route 40 or U.S. Highway 40 (US 40), also known as the Main Street of America (a nickname shared with U.S. Route 66), is a major east–west United States Highway traveling across the United States from the Mountain States to the Mid- ...
be similarly truncated, as this highway largely duplicated
Interstate 80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
in the same states. Despite Nevada's request, the petition was submitted and approved in 1974. Retracing the path of historic U.S. Route 91 is possible but difficult. In most cities the route of US 91 is still in use as a local street or highway. In many rural areas, I-15 was built on top of the former US 91. The highway passed through the following states: *
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
(until 1974) *
Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...
(until 1974) *
Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...
(10 miles (16 km) in the
Arizona Strip The Arizona Strip is the part of Arizona lying north of the Colorado River. Despite being larger in area than several U.S. states, the entire region has a population of fewer than 10,000 people. Consisting of northeastern Mohave County and ...
, until 1974) *
Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...
*
Idaho Idaho ( ) is a landlocked U.S. state, state in the Pacific Northwest and Mountain states, Mountain West subregions of the Western United States. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington (state), ...
*
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...
(until 1980)


California

US 91's original southern terminus was at the intersection of Atlantic Avenue (historically SR 15) and East Pacific Coast Highway ( SR 1) in
Long Beach Long Beach is a coastal city in southeastern Los Angeles County, California, United States. It is the list of United States cities by population, 44th-most populous city in the United States, with a population of 451,307 as of 2022. A charter ci ...
. This intersection also marked the historic western terminus of US 6, which proceeded west from that intersection. East of the intersection, US 91 proceeded east along East Pacific Coast Highway to Los Alamitos Circle. The portions in California were replaced with: * SR 1 (Pacific Coast Highway from Atlantic Avenue to Los Alamitos Circle) * SR 19 (Lakewood Boulevard from Los Alamitos Circle to Lincoln Avenue) * SR 214 (route no longer a state highway – Carson Street and Lincoln Avenue) * SR 91 * I-215 *
I-15 I15 may refer to: * Interstate 15, a north–south Interstate Highway in the United States of America * Polikarpov I-15, a Soviet fighter aircraft * I15 (band), a band * , of the Imperial Japanese Navy * Älvsborg Regiment The Älvsborg Regiment ...


Nevada

The route of US 91 in Nevada was replaced with I-15 in 1974. South of Las Vegas, most of the old route is still intact, as it runs parallel and to the east of the freeway from Jean to Sloan. Visitors to the popular ''
Seven Magic Mountains ''Seven Magic Mountains'' is an art installation in Ivanpah Valley, along the far southern end of Las Vegas Boulevard. It was created by the Swiss artist Ugo Rondinone, but commissioned and financed by the Art Production Fund and the Nevada Muse ...
'' art installation must travel at least a dozen miles on the old route to reach the site. In Las Vegas, US 91 was better known as Las Vegas Boulevard ( State Route 604 after the 1976 renumbering of most Nevada state highways). The intersection of Las Vegas Boulevard and Fremont Street is the historic intersection with U.S. 93 and U.S. 95. Here, U.S. 466 parted ways with US 91 and headed southeast on Fremont Street with southbound US 93 and US 95. At this intersection, US 93 and 95 departed Fremont Street and turned northeast onto Las Vegas Boulevard, heading northbound with US 91. A few blocks further up, at Bonanza Road, US 95 turned west until it hit Rancho Drive, then continued north. US 91/93 stayed aligned with Las Vegas Boulevard, which turned into Salt Lake Highway after departing the city of North Las Vegas. Until its decertification in 1974, US 91 followed I-15 to exit 112, where it took present-day NV 170 through Riverside to
Mesquite Mesquite is a common name for some plants in the genera ''Neltuma'' and '' Strombocarpa'', which contain over 50 species of spiny, deep-rooted leguminous shrubs and small trees. They are native to dry areas in the Americas. Until 2022, these ge ...
, turned right onto NV 144 (Mesquite Boulevard and Sandhill Boulevard), and then followed Hillside Drive into
Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...
(where the road became Fairview Avenue).


Arizona

US 91 entered Arizona from Nevada on Fairview Avenue and followed it northeast to Littlefield. Once Fairview Avenue crosses I-15, it became Cane Beds Road through downtown
Beaver Dam A beaver dam or beaver impoundment is a dam built by beavers; it creates a pond which protects against predators such as coyotes, alligators, cougars, foxes, eagles, wolves and bears, and holds their food during winter. These structures modify th ...
and into
Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...
, where the road continued as Old Highway 91. Today, this section of US 91 is known as
Mohave County Mohave County occupies the northwestern corner of the U.S. state of Arizona, one of 15 counties in the state. As of the 2020 census, its population was 213,267. The county seat is Kingman, and the largest city is Lake Havasu City. It is th ...
Road 91.


Utah

From the State Line to
Saint George Saint George (;Geʽez: ጊዮርጊስ, , ka, გიორგი, , , died 23 April 303), also George of Lydda, was an early Christian martyr who is venerated as a saint in Christianity. According to holy tradition, he was a soldier in the ...
US 91 followed a semi-circular route that given the name Old Dixie Highway 91 in 2023. Washington County officials gave the former segment of US 91 the name as part of an effort to preserve the nickname
Utah's Dixie Dixie is a nickname for the populated, lower-elevation area of south-central Washington County, the southwest corner of the State of Utah, bordering nearby Arizona to the south, and Nevada to the west. The area lies in the northeastern Mojave ...
for this region of Utah, co-inciding with the removal of the name Dixie from
Utah Tech University Utah Tech University (UT), formerly named Dixie State University (DSU), is a polytechnic four-year public university in St. George, Utah, in southwest Utah (also known by the longtime nickname of " Utah's Dixie" region). UT offers doctoral degre ...
. Dixie Highway 91 continues to Santa Clara and followed what is now SR-8 and SR-18 to St. George. Where SR-18 intersects St. George Blvd, US 91 then continued east on St. George Blvd. ( SR-34) until it intersected Red Cliffs Rd. From there, US 91 went in a north-east direction, with Red Cliffs becoming Telegraph St. in
Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...
. US 91 followed on Telegraph until becoming Main St. in
Leeds Leeds is a city in West Yorkshire, England. It is the largest settlement in Yorkshire and the administrative centre of the City of Leeds Metropolitan Borough, which is the second most populous district in the United Kingdom. It is built aro ...
. After leaving Leeds, Old 91 is still intact until about a half mile north of the junction with SR-228 where its routing runs right into I-15. US 91 picks up again in Black Rock in northern Washington County at exit 36 on I-15. It continues parallel to I-15 until just past exit 40, then picks up again on the other side of the freeway. This section of the road is not maintained and some of the original paving is still visible between the end of the road at Lower Taylor Creek Trailhead and when normal paving resumes near the road to New Harmony (old SR-144), at I-15 exit 42. The road, marked as Old US 91, then runs north through
Kanarraville Kanarraville ( ) is a town in Iron County, Utah, United States. The population was 355 at the 2010 census. Demographics As of the census of 2000, there were 311 people, 125 households, and 96 families residing in the town. The population den ...
and into
Cedar City Cedar City is the largest city in Iron County, Utah, United States. Located south of Salt Lake City, it is north of Las Vegas on Interstate 15 in Utah, Interstate 15. Southern Utah University is located in Cedar City. It is the home of the Ut ...
near exit 57, merging into Main St ( SR-130) until near the city border with
Enoch Enoch ( ; ''Henṓkh'') is a biblical figure and Patriarchs (Bible), patriarch prior to Noah's flood, and the son of Jared (biblical figure), Jared and father of Methuselah. He was of the Antediluvian period in the Hebrew Bible. The text of t ...
just past exit 62. Old US 91 continues to parallel I-15 to
Summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used only for ...
. The road crosses I-15 again at exit 71 and continues its original route through
Parowan Parowan ( ) is a city in and the county seat of Iron County, Utah, United States. The population was 2,790 at the 2010 census, and in 2018 the estimated population was 3,100. Parowan became the first incorporated city in Iron County in 1851. A ...
, merging with SR-274 after briefly running along modern SR-143. There is no additional signage in Parowan to indicate the original route, though historical maps show that it follows SR-271 through
Paragonah Paragonah ( ) is a town in Iron County, Utah, United States. The population was 536 at the 2020 census. Demographics As of the census of 2000, there were 470 people, 156 households, and 122 families residing in the town. The population dens ...
. There are some frontage roads along I-15 through Beaver that may be sections of the original highway in Iron County. In Beaver County, sections of SR-160 through
Beaver Beavers (genus ''Castor'') are large, semiaquatic rodents of the Northern Hemisphere. There are two existing species: the North American beaver (''Castor canadensis'') and the Eurasian beaver (''C. fiber''). Beavers are the second-large ...
and the road running north through Manderfield use original sections of US 91. There are also sections of roadway that used to be US 91 from before exit 129 through
Cove Fort, Utah Cove Fort is a fort, unincorporated community, and historical site located in Millard County, Utah. It was founded in 1867 by Ira Hinckley (the paternal grandfather of Gordon B. Hinckley) at the request of Brigham Young. One of its distincti ...
, in
Millard County Millard County ( ) is a County (United States), county in the U.S. state of Utah. As of the 2020 United States census, the population was 12,975. Its county seat is Fillmore, Utah, Fillmore, and the largest city is Delta, Utah, Delta. History ...
, intersecting both I-70 and later I-15 north of the I-70/I-15 interchange, including what is now SR-161. Some frontage roads along I-15 may be parts of US 91. The route picks up again at exit 146 on SR-133 through Kanosh and
Meadow A meadow ( ) is an open habitat or field, vegetated by grasses, herbs, and other non- woody plants. Trees or shrubs may sparsely populate meadows, as long as they maintain an open character. Meadows can occur naturally under favourable con ...
before being supplanted by frontage roads and I-15. SR-99 through Fillmore and SR-64 through
Holden Holden, formerly known as General Motors-Holden, was an Australian subsidiary company of General Motors. Founded in Adelaide, it was an automobile manufacturer, importer, and exporter that sold cars under its own marque in Australia. It was ...
are also pieces of US 91 before running concurrently with US 50 until it merges again with I-15. The original alignment of US 91 also diverges from I-15 through most of Juab County. At Chicken Creek Reservoir, the historic route of US 91 leaves I-15 and follows SR-78 northeast to Levan where it turns north along modern SR-28 and continues through Nephi along that city's Main Street. North of Nephi, it follows what is now Mona Road, passing through Mona, before rejoining the modern I-15 alignment near Rocky Ridge. In Utah County, the old US 91 leaves I-15 again at
Santaquin Santaquin ( ) is a city in Utah and Juab counties in the U.S. state of Utah. It is part of the Provo–Orem metropolitan area. The population was 13,725 at the 2020 census. Geography Santaquin lies southeast of Utah Lake in southern Utah Coun ...
, following SR-198 northeast through Payson and Salem before reaching Spanish Fork. In Spanish Fork, it ran north on Main Street (now SR-156, east on 800 North, and northeast on what is now SR-51 to Springville. In Springville US 91 first joined US 89 at one of the oldest grade-separated interchanges in Utah (this portion is now SR-51). From this junction to
Logan Logan may refer to: Places * Mount Logan (disambiguation) Australia * Logan (Queensland electoral district), an electoral district in the Queensland Legislative Assembly * Logan, Victoria, small locality near St. Arnaud * Logan City, local gove ...
the two highways ran mostly concurrent. This portion is mostly intact as US 89. However, US 91 diverged from US 89 between Farmington and
Ogden Ogden may refer to: Places Canada *Ogden, Calgary, in Calgary, Alberta *Ogden, Quebec, a small municipality in the Eastern Townships * Ogdensville, British Columbia or Ogden City, alternate names for gold rush-era Seymour Arm, British Columbia *Og ...
. US 91 split away on what is now State Route 273, State Route 126 and State Route 26. These highways form the Main Street through Kaysville and Layton; State Street from the Layton- Clearfield border to Main Street in Clearfield though the city of
Sunset Sunset (or sundown) is the disappearance of the Sun at the end of the Sun path, below the horizon of the Earth (or any other astronomical object in the Solar System) due to its Earth's rotation, rotation. As viewed from everywhere on Earth, it ...
turning into 1900 West at the Sunset-
Roy Roy or Roi is a masculine given name and a family surname with varied origins. France In France, this family name originated from the Normans, the descendants of Norse Vikings who migrated to Amigny, a commune in Manche, Normandy.. The deriva ...
border, then following 1900 West to a junction with Riverdale Road in Roy, then following Riverdale Road through Riverdale, and then meeting back up with US 89 at Washington Blvd in Ogden.


Idaho

US 91 formerly entered Idaho Falls along Yellowstone Highway, and returned to the course of modern I-15 north of town. The highway then proceeded north toward
Monida Pass Monida Pass is a high mountain pass in the northern Rocky Mountains of the western United States, at an elevation of above sea level on Interstate 15, and  on the Union Pacific Railroad. On the Continental Divide in the Bitterroot Range, it ...
where the highway entered
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...
. In some small towns streets used by the route are called "Old Highway 91".


Montana

In Montana, the highway's alignment slightly changed with the construction of the
Clark Canyon Dam Clark Canyon Dam is an earthfill dam located in Beaverhead County, Montana, about south of the county seat of Dillon. The dam impounds the waters of the Beaverhead River, creating a body of water known as Clark Canyon Reservoir. The structure w ...
. Starting just south of
Dillon Dillon may refer to: People *Dillon (surname) * Dillon (given name) *Dillon (singer) (born 1988), Brazilian singer * J. J. Dillon, primary ring name of American professional wrestler James Morrison (born 1942) Places Canada * Dillon, Saskatchewa ...
, I-15 was built on a new alignment that mostly parallels US 91 and crosses over it several times. In Dillon, the former route of the highway is now known as Atlantic Street and Montana Street. The highway formerly joined with
U.S. Route 10 U.S. Route 10 or U.S. Highway 10 (US 10) is an east–west United States Numbered Highway located in the Midwest and Great Lakes regions of the U.S. Despite the "0" as the last digit in the number, US 10 is no longer a cross- ...
between Rocker and downtown
Butte In geomorphology, a butte ( ) is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller landforms than mesas, plateaus, and table (landform), tablelands. The word ''butte'' comes from the French l ...
and took a northeasterly path to Elk Park Pass before it was rerouted to its current alignment east of Butte in 1980 (today's southbound lanes of I-15). It formed the main street of
Boulder In geology, a boulder (or rarely bowlder) is a rock fragment with size greater than in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. In ...
before I-15 was completed, and was routed through
Helena Helena may refer to: People *Helena (given name), a given name (including a list of people and characters with the name) *Katri Helena (born 1945), Finnish singer * Saint Helena (disambiguation), this includes places Places Greece * Helena ...
along what is now Montana Secondary Highway 518 and Montana Secondary Highway 229. Because of the new alignment of I-15 in Montana, many segments of the former US 91 are still in use today as
frontage roads A frontage road (also known as an access road, outer road, service road, feeder road, or parallel road) is a local road running parallel to a higher-speed, limited-access road. Where parallel high-speed roads are provided as part of a majo ...
or sportsmen access points along the
Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...
, especially from Helena north to Great Falls and Sweetgrass, and from Butte south to Divide and Dillon.


In popular culture

The US 91 corridor in Idaho's Cache Valley was the primary filming location for the 2004 movie ''
Napoleon Dynamite ''Napoleon Dynamite'' is a 2004 American Independent film, independent Coming-of-age story, coming-of-age comedy film produced by Jeremy Coon, Chris Wyatt (producer), Chris Wyatt and Sean C. Covel (producer), Sean Covel, written by Jared and J ...
''. The former U.S. Route 91 corridor was also the birthplace of both
McDonald's McDonald's Corporation, doing business as McDonald's, is an American Multinational corporation, multinational fast food chain store, chain. As of 2024, it is the second largest by number of locations in the world, behind only the Chinese ch ...
, with the first location opening on E Street in
San Bernardino San Bernardino ( ) is a city in and the county seat of San Bernardino County, California, United States. Located in the Inland Empire region of Southern California, the city had a population of 222,101 in the 2020 census, making it the List of ...
(E Street was the routing of US 91 before the construction of freeways in the area), as well as the first
Kentucky Fried Chicken KFC Corporation, doing business as KFC (an abbreviation of Kentucky Fried Chicken), is an American fast food restaurant chain specializing in fried chicken and chicken sandwiches. Headquartered in Louisville, Kentucky, it is the world's s ...
, with the first location opening in
Salt Lake City Salt Lake City, often shortened to Salt Lake or SLC, is the capital and most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, the most populous county in the state. The city is the core of the Salt Lake Ci ...
at State Street and 3900 South. The McDonald's location is now a museum, while the KFC is still in operation with a small historical display inside the restaurant. First McD SBD.jpg, The site of the first McDonalds restaurant in San Bernardino, California (August 2014) Worlds first kfc.jpg, KFC bucket sign proclaims "World's First KFC on State Street and 3900 South in Salt Lake County, Utah (January 2020) The novel ''
Damnation Alley ''Damnation Alley'' is a 1969 science fiction novel by American writer Roger Zelazny, based on a novella of the same name published in 1967. A film adaptation of the novel was released in 1977. Plot introduction The story opens in a post-apoc ...
'' (1969) by
Roger Zelazny Roger Joseph Zelazny (May 13, 1937 – June 14, 1995) was an American fantasy and science fiction writer known for his short stories and novels, best known for '' The Chronicles of Amber''. He won the Nebula Award three times (out of 14 nominatio ...
features the beginning of a cross-country trip on Route 91, just outside of Los Angeles. The 2016 documentary '' California Typewriter'' features a brief segment about the road as part of the ''
Ed Ruscha Edward Joseph Ruscha IV (, ''roo-SHAY''; born December 16, 1937) is an American artist associated with the anti- pop art movement. He has worked in the media of painting, printmaking, drawing, photography, and film. He is also noted for creating s ...
'' book Royal Road Test. In it, Ruscha, ''
Mason Williams Mason Douglas Williams (born August 24, 1938) is an American classical guitarist, composer, singer, writer, comedian, and poet, best known for his 1968 instrumental " Classical Gas" and for his work as a comedy writer on ''The Smothers Brothers ...
'', and Patrick Blackwell use the road as a testing strip for the book by throwing a Royal typewriter out of the window of their car at 90 miles per hour.


Major intersections


See also

*
Route 91 Harvest Route 91 Harvest was a country music festival in the United States that was held annually in Paradise, Nevada, from 2014 to 2017 in the Las Vegas Village, a lot on Las Vegas Boulevard (former U.S. Route 91), directly across from the Luxor L ...
, an annual country music event held from 2014 to 2017 on old US 91 near
Las Vegas, Nevada Las Vegas, colloquially referred to as Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. The Las Vegas Valley metropolitan area is the largest within the greater Mojave Desert, and second-l ...
*
U.S. Route 191 U.S. Route 191 (US 191) is a north–south highway in the Western United States and a spur of parent route U.S. Route 91 that has two segments. The southern segment runs for from Douglas, Arizona on the Mexican border to the southern part o ...
* U.S. Route 491 * U.S. Route 91 Alternate (Nevada)


Notes


References


External links


Endpoints of U.S. Highway 91
{{s-end 91 91 91 Transportation in Box Elder County, Utah Transportation in Cache County, Utah Transportation in Franklin County, Idaho Transportation in Bannock County, Idaho Transportation in Bingham County, Idaho Transportation in Bonneville County, Idaho 91