Business routes of Interstate 15

Interstate 15 Business
Interstate 15 Business
Location	Lake Elsinore, California

Interstate 15 Business
Interstate 15 Business
Location	Escondido, California

Interstate 15 Business
Interstate 15 Business
Location
Country	United States
Highway system
	Interstate Highway System ; Main ; Auxiliary ; Suffixed ; Business ; Future ;

Last updated April 15, 2024

Interstate 15 Business may refer to several business routes of the Interstate Highway System that connects Interstate 15 with the central business district of various cities bypassed by I-15. The business route in each community is considered a unique route. In many cases, these routes are a former section of a U.S. Route or state highway.

California

Interstate business routes in California are assigned by the California Department of Transportation (Caltrans), but are not maintained by Caltrans unless they overlay other routes of the state highway system. Local authorities may request route assignment from the Caltrans Transportation System Information Program, and all requests require approval of the executive committee of the American Association of State Highway and Transportation Officials (AASHTO).^[1]

Escondido business loop

Interstate 15 Business (I-15 Bus.) provides access to downtown Escondido as Centre City Parkway. It follows the former routing of U.S. Route 395 (US 395).

I-15 Bus. begins at I-15 exit 28 near the southern city limits of Escondido. It runs parallel to I-15 north through the city. It intersects both the westbound and eastbound portions of County Route S6, which in this area is split into one-way roads (which are in turn separated by another street). This intersection provides access to the end of the Sprinter hybrid rail service. Shortly thereafter, I-15 Bus. intersects County Route S14, and then interchanges with California State Route 78 (SR 78). The interchange is the last interchange on SR 78 before its freeway status ends, and there are only ramps for a westbound entrance or eastbound exit. Continuing north, I-15 Bus. intersects with El Norte Parkway, a major arterial road, before reconnecting with I-15 at exit 34 near the northern city limits of Escondido. Though the street itself continues northward well on into Temecula as a frontage road for I-15, its designation as I-15 Bus. ends at this interchange.

Lake Elsinore business loop

Interstate 15 Business in Lake Elsinore, California, provides access to downtown Lake Elsinore as Main Street, Graham Avenue, Lakeshore Drive, and Lake Street. It also follows the former routing of SR 71.

Norco business loop

Interstate 15 Business

Location	Norco, California

Interstate 15 Business in Norco, California provides access to downtown Norco as Second Street, Hamner Avenue, and Sixth Street. It also follows the former routing of SR 31.

Victorville business loop

Interstate 15 Business

Location	Victorville, California

Interstate 15 Business in Victorville, California, provides access to downtown Victorville as Seventh Street and D Street. It also follows the former routing of US 66 and US 91.

Barstow business loop

Interstate 15 Business

Location	Barstow, California

Interstate 15 Business in Barstow, California, provides access to downtown Barstow as L Street and Main Street. It also follows the former routing of US 66.

Baker business loop

Interstate 15 Business

Location	Baker, California

Interstate 15 Business in Baker, California, provides access to downtown Baker as Baker Boulevard. It also follows the former routing of US 91 and US 466.

Utah

St. George business loop

Interstate 15 Business

Location	St. George, Utah

Interstate 15 Business in St. George, Utah, is the first business route along I-15 in the state of Utah. It runs from exit 6 north along Utah State Route 18 (SR-18, Bluff Street) to SR-34 (West St. George Boulevard), where it turns east until reaching exit 8.

Cedar City business loop

Interstate 15 Business

Location	Cedar City, Utah

Interstate 15 Business in Cedar City, Utah, is the second business route along I-15 in the state of Utah. It runs from exit 57 north along SR-130 (Main Street), where it runs near Southern Utah University and the Paiute Indian Reservation-Cedar City until reaching exit 62.

Parowan business loop

Interstate 15 Business

Location	Parowan, Utah

Interstate 15 Business (I-15 Bus.) in Parowan, Utah, is the third business route along I-15 in the state of Utah. It runs from exit 75 along SR-143, at first east on 200th Street, then north on South Main Street (Old US Highway 91) until SR-143 turns east onto East Center Street. I-15 Bus. then continues north along SR-274 (North Main Street) eventually serving as the western terminus of SR-271 near Parowan Airport until finally terminating at exit 78.

Beaver business loop

Interstate 15 Business

Location	Beaver, Utah

Interstate 15 Business in Beaver, Utah, is the fourth business route along I-15 in the state of Utah. It runs from exits 109 to 112 along SR-160.

Fillmore business loop

Interstate 15 Business

Location	Fillmore, Utah

Interstate 15 Business in Fillmore, Utah, is the fifth business route along I-15 in the state of Utah. It runs from exits 163 to 167 along SR-99.

Nephi business loop

Interstate 15 Business

Location	Nephi, Utah

Interstate 15 Business in the vicinity of Nephi, Utah, is the sixth business route along I-15 in the state of Utah. It runs from exits 222 to 228 along part of SR-28.

Brigham City business loop

Interstate 15 Business

Location	Brigham City, Utah

Interstate 15 Business (I-15 Bus.) is a Business loop of I-15 in Bringham City, and is also concurrent with I-84 Bus. It runs from an interchange at exit 362 on I-15/I-84 at first along US 91 to the intersection with US 89 and SR-13. US 91 continues east along US 89, while I-15 Bus. / I-84 Bus. turn left to go north along SR-13 (South Main Street). Further in town, the road serves as the west end of SR-90. At Forest Street, South Main Street becomes North Main Street. North of there, SR-13 / I-15 Bus. / I-84 Bus. curves to the left onto Promontory Road, while North Main Street's designation is replaced by SR-38. From there, the routes run beneath a bridge for North 500th Street West and then another bridge for a Union Pacific Railroad line, eventually ending at a folded-diamond interchange with I-15/I-84 at exit 365, while SR-13 continues to run northwest through Corinne and points further north.

Tremonton business loop

Interstate 15 Business

Location	Tremonton, Utah

Interstate 15 Business (I-15 Bus.) in the vicinity of Tremonton, Utah, is the last business route along I-15 in the state of Utah. It runs from exit 376 in Elwood at the I-15/I-84 overlap, running north along SR-13 (4700th Street West). It also runs along a concurrency with I-84 Bus. At the intersection with SR-102, I-15 Bus. / I-84 Bus. turn west onto East Main Street, while SR-13 continues north toward Riverside and Plymouth. At North and South Tremonton Street, SR-102 / I-15 Bus. / I-84 Bus. changes from East Man Street to West Main Street, then I-15 Bus. leaves the concurrency with SR 102 / I-84 Bus. at the intersection with Iowa String Road where it turns north. I-15 Bus. runs along the Box Elder County Fairgrounds, then, at the Bear River Hospital, makes one last left turn west onto West 1000th Street North until finally terminating at exit 381 on I-15.

Idaho

McCammon business loop

Interstate 15 Business

Location	McCammon, Idaho

Interstate 15 Business (I-15 Bus.) has a length of 4.338 miles (6.981 km) through McCammon in central Bannock County. I-15 Bus. begins at I-15 exit 44 along Jensen Road, then turns north and follows State Street to the city of McCammon. Just north of the city limits, the business route veers onto Center Street and follows that through the center of town. At the north end of the city, I-15 Bus. turns west and runs concurrently with US 30 to its northern end at I-15 exit 47.

Inkom business loop

Interstate 15 Business

Location	Inkom, Idaho

Interstate 15 Business (I-15 Bus.) runs for exactly 1 mile (1.6 km) through Inkom in northern Bannock County. I-15 Bus. mostly follows Old Highway 91 between exits 57 and 58, a pair of partial interchanges.

Pocatello business loop

Interstate 15 Business

Location	Pocatello, Idaho

Interstate 15 Business (I-15 Bus.) spans 5.560 miles (8.948 km) through Pocatello in northern Bannock County. I-15 Bus. begins at I-15 exit 67, where US 30 and US 91 also diverge from I-15. The business route and the U.S. Routes follow Fifth Avenue northwest. The routes split onto a one-way pair of Fifth Avenue northbound and Fourth Avenue southbound. The highways pass by Idaho State University and through downtown Pocatello. At the north end of downtown, I-15 Bus. and the U.S. Routes veer north and converge as Pocatello Avenue. US 30 turns west at Oak Street; the business route and US 91 continue north along Yellowstone Avenue. I-15 Bus. leaves US 91 when it turns east onto Alameda Road, which becomes Pocatello Creek Road when it veers northeast to the business route's terminus at I-15 exit 71.

Blackfoot business loop

Interstate 15 Business

Location	Blackfoot, Idaho

Interstate 15 Business (I-15 Bus.) has a length of 4.802 miles (7.728 km) through Blackfoot in central Bingham County. I-15 Bus. begins at I-15 exit 89 near the northern end of the Fort Hall Indian Reservation and follows US 91 northeast parallel to the Union Pacific Railroad. The highways cross the Blackfoot River into the city of Blackfoot along Broadway Street. In downtown Blackfoot, the routes veer onto Main Street, then I-15 Bus. turns northwest onto a one-way pair, Bridge Street northbound and Judicial Street southbound. The streets converge as Bridge Street, which the business route follows to its end at I-15 exit 93. The roadway continues beyond the interchange as US 26 and immediately crosses the Snake River.

Idaho Falls business loop

Interstate 15 Business

Location	Idaho Falls, Idaho

Interstate 15 Business (I-15 Bus.) runs for 3.409 miles (5.486 km) through Idaho Falls in western Bonneville County. I-15 Bus. begins at I-15 exit 116, which is also where US 26 diverges from the Interstate. The business route and U.S. Route follow Sunnyside Road across the Snake River to Yellowstone Avenue; this intersection forms the northern terminus of US 91. I-15 Bus. and US 26 follow Yellowstone Avenue northeast parallel to the Union Pacific Railroad into downtown Idaho Falls. At the intersection of Yellowstone Avenue and Broadway Street, I-15 Bus. turns northwest onto Broadway Street and runs concurrently with US 20 Bus. across another bridge over the Snake River to their mutual termini at I-15 exit 118. The roadway continues west as US 20.

Montana

Dillon business loop

Interstate 15 Business

Location	Dillon, Montana

Interstate 15 Business (I-15 Bus.) is a business loop of I-15 in Dillon. It runs from a diamond interchange at exit 62 along Atlantic Street, Helena Street and Montana Street to a brief overlap with Montana Highway 41 (MT 41) that ends at a trumpet interchange at exit 63.

Route description

The I-15 Business Loop begins at exit 62 across from a road leading to the Kiwanis International-established Cornell Park, then, after crossing a bridge over an Oregon Short Line Railroad line, curves north along Atlantic Street, briefly crossing another bridge overnight Blacktail Deer Creek. Between East Chapman and East Poindexter Streets, the route is joined by the former US 91. At Beaver County High School, I-15 Bus. makes a left turn onto Helena Street and, just before crossing the same OSR tracks it ran over earlier, makes a right turn onto Montana Street. Moving away from Downtown Dillon, Former US 91 branches off to the northwest, then across from the intersection with Ramshorn Street, the road turns west onto a wrong way concurrency with MT 41. I-15 Bus. / MT 41 climbs a bridge over former US 91 as well as the OSR line and Blacktail Deer Creek all at once, then makes a southbound curve before finally ending at a trumpet interchange at exit 63.

Butte business loop

Interstate 15 Business

Location	Butte, Montana

Interstate 15 Business (I-15 Bus.) is a business loop of I-15 in Butte. It runs from a flyover interchange at exit 124 on I-90 at I-115 to a partial cloverleaf interchange with MT 2 at exit 127. Beside I-115, I-15 Bus. is also concurrent with I-90 Bus.

Helena business loop

Interstate 15 Business

Location	Helena, Montana

Interstate 15 Business (I-15 Bus.) is a business loop of I-15 in the capital city of Helena. It runs west from exit 192 along US 12 in Montana at the east end of a one-way pair along Prospect Avenue westbound and 11th Avenue eastbound. At North Montana Avenue, both US 12 and I-15 Bus. turn north, but US 12 curves west onto East Lyndale Avenue between Boulder Avenue and Helena Avenue, and I-15 Bus. follows along this curve, while North Montana Avenue continues north as Lewis and Clark County Road 229. At North Last Chance Gulch, I-15 Bus. turns north-northeast while US 12 continues west along West Lyndale Avenue and I-15 Bus. passes between Centennial Park and Memorial Park, the grounds of the stadium used by the Helena Brewers. After crossing a bridge over a former Northern Pacific Railroad line, I-15 Bus. begins to turn northeast and then, at the intersection of North Montana Avenue, becoming Cedar Street running east, eventually ending at I-15 on exit 193 across from the Helena Regional Airport.

Great Falls business loop

Interstate 15 Business

Location	Great Falls, Montana
Existed	1960s^[2]–present

Interstate 15 Business (I-15 Bus.) in Great Falls, Montana, links I-15, which bypasses downtown Great Falls to the west, to the center of Great Falls. As its business loop designation implies, I-15 Bus. terminates at I-15 (concurrent with US 89 and MT 200 through western Great Falls) at each end. The southernmost 0.83 miles (1.34 km) of the route, from the interchange with I-15 to Fox Farm Road, is designated, but not signed, as Interstate 315.^[3] It is the second shortest Interstate in the country, the shortest being I-878.

Conrad business loop

Interstate 15 Business

Location	Conrad, Montana

Interstate 15 Business is a business loop of I-15 in Conrad. It runs along Old Highway 91 from diamond interchanges at exit 335 and exit 339. The north end was originally a half-diamond/trumpet interchange until it was rebuilt in the 2010s, and was given a rest area / truck weigh station east of the interchange.

Shelby business loop

Interstate 15 Business

Location	Shelby, Montana

Interstate 15 Business (I-15 Bus.) in Shelby, Montana links I-15, which bypasses downtown Shelby to the west, to the center of Shelby. The southern terminus of I-15 Bus. is at exit 363 on I-15; from there it follows US 2 into the center of Shelby, then follows Montana Highway 67 (Oilfield Road) across the railyard and through the north end of town to its northern terminus at exit 364 on I-15, just south of Shelby Airport.

Former routes

Las Vegas business loop

Interstate 15 Business

Location	Las Vegas, Nevada
Existed	2022

Mesquite business loop

Interstate 15 Business

Location	Mesquite, Nevada
Existed	December 31, 1991–December 31, 2005

Interstate 15 Business in Mesquite, Nevada, was also designated as State Route 144. It was removed as of December 31, 2005. It covered Mesquite Boulevard and Sandhill Boulevard in Mesquite. The State Route designation was applied to the portion of Mesquite Boulevard from its southern crossing of I-15 to Sandhill Boulevard, then along Sandhill Boulevard to its northern crossing of I-15. The route was 3.132 miles (5.040 km) long.^[4]

Route 144, from SR 170 to Hillside Drive, was once US 91, which used to stretch from Sweetgrass, Montana, to Long Beach, California.

Holden business loop

Interstate 15 Business

Location	Holden, Utah

The former Interstate 15 Business in Holden, Utah, served I-15 in the state of Utah. It ran from exit 174 at SR-64 to US 50 where it terminated at exit 178, the southern terminus of the I-15 / US 50 overlap.

Payson business loop

Interstate 15 Business

Location	Payson, Utah

Layton business loop

Interstate 15 Business

Location	Layton, Utah

Related Research Articles

U.S. Route 91 or U.S. Highway 91 is a 172.7-mile-long (277.9 km) north–south United States highway running from Brigham City, Utah, to Idaho Falls, Idaho, in the U.S. states of Idaho and Utah. 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. The highway currently serves to connect the communities of the Cache Valley to I-15 and beyond. 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. A portion of the highway's former route in California is currently State Route 91.

U.S. Route 92 or U.S. Highway 92 is a 181-mile (291 km.) U.S. Route entirely in the U.S. state of Florida. The western terminus is at US 19 Alt. and SR 687 in downtown St. Petersburg. The eastern terminus is at SR A1A in Daytona Beach.

U.S. Route 258 is a spur of US 58 in the U.S. states of North Carolina and Virginia. The U.S. Highway runs 220.15 miles (354.30 km) from US 17 Business and NC 24 Business in Jacksonville, North Carolina north to Virginia State Route 143 at Fort Monroe in Hampton, Virginia. In North Carolina, US 258 connects Jacksonville with the Inner Banks communities of Kinston, Snow Hill, Farmville, Tarboro, and Murfreesboro. The U.S. Highway continues through the Virginia city of Franklin, where the highway intersects US 58, and the town of Smithfield on its way to the Hampton Roads metropolitan area. US 258 crosses the James River on the James River Bridge and follows Mercury Boulevard through Newport News and Hampton.

Interstate 15 Business is a business loop of Interstate 15 (I-15) in Cascade County, Montana, United States, almost entirely within Great Falls. The route links I-15 with the center of Great Falls. As its business loop designation implies, I-15 Bus. terminates at I-15 at each end. The southernmost 0.83 miles (1.34 km) of the route from the interchange with I-15 to Fox Farm Road is designated, but not signed, as Interstate 315 (I-315). I-315 is the second shortest Interstate in the country; only the unsigned I-878 in New York is shorter; it is also the northernmost auxiliary Interstate of I-15.

U.S. Route 460 (US 460) in Virginia runs west-east through the southern part of the Commonwealth. The road has two separate pieces in Virginia, joined by a relatively short section in West Virginia. Most of US 460 is a four-lane divided highway and is a major artery in the southern third of the state. From Petersburg to Suffolk, US 460 is a four-lane non-divided highway. It is a popular alternative to Interstate 64 (I-64) when going from Richmond and other points in central Virginia to the Currituck Sound and Outer Banks of North Carolina, avoiding the congestion and tunnels of the more northerly I-64 corridor. The road passes through several small towns that built up at stops along the railroad line.

U.S. Route 58 Alternate is an 87.40-mile-long (140.66 km) alternate route to US 58 in western Virginia. The route is a northern bypass to US 58 which stays closer to the Tennessee border and serves Gate City and Bristol.

Nine business routes of Interstate 44 (I-44) exist, all of them within the state of Missouri.

<span class="mw-page-title-main">Interstate 15 in Idaho</span> Section of Interstate highway in Idaho, United States

Interstate 15 (I-15) is a part of the Interstate Highway System that runs from San Diego, California, to Sweetgrass, Montana. In Idaho, the Interstate Highway runs exactly 196 miles (315 km) from the Utah state line near Woodruff north to the Montana state line at Monida Pass. I-15 is the primary north–south highway of Eastern Idaho. The Interstate Highway connects Pocatello and Idaho Falls, the fourth and fifth largest cities in Idaho, and the smaller county seats of Malad City, Blackfoot, and Dubois. I-15 connects all of those cities with Salt Lake City to the south and Butte to the north. The Interstate has business loops through McCammon, Inkom, Pocatello, Blackfoot, and Idaho Falls.

Several special routes of U.S. Route 23 (US 23) exist. There are 18 extant special routes along US 23 and 14 former routes.

Interstate business routes are roads connecting a central or commercial district of a city or town with an Interstate bypass. These roads typically follow along local streets often along a former U.S. Route or state highway that had been replaced by an Interstate. Interstate business route reassurance markers are signed as either loops or spurs using a green shield shaped sign and numbered like the shield of the parent Interstate highway.

Interstate 80 Business may refer to several business routes of the Interstate Highway System that connects Interstate 80 with the central business district of various cities bypassed by I-80. The business route in each community is considered a unique route. In many cases, these routes are a former section of a U.S. Route or state highway.

Business routes of Interstate 5 (I-5) exist in both California and Washington. There are no business routes in Oregon as that state does not assign such designations for any of its Interstate Highways. However, Oregon Route 99 (OR 99) essentially acts as a business route for most of Oregon, along with OR 99W and OR 99E, which also has its own business route in Salem.

There are 13 active business routes of Interstate 70 in Colorado. Interstate 70 (I-70) spans Colorado in an east–west fashion, holding many business loops and spurs along the way, varying from lengths of 0.22 miles (0.35 km) to 27.47 miles (44.21 km), with a total of 55.51 miles (89.33 km). Four other business routes also used to exist within the state.

Interstate 90 Business may refer to several business routes of the Interstate Highway System that connects Interstate 90 with the central business district of various cities bypassed by I-90. Each business route can be either a business loop or a business spur, depending on whether both ends connect to I-90. The business route in each community is considered a unique route. In many cases, these routes are a former section of a U.S. Route.

There are 19 business routes of Interstate 94 (I-94) in the United States. These business routes connect the downtown business districts of cities to the freeway along I-94.

Business routes of Interstate 75 exist in three states. Georgia has three existing Interstate 75 (I-75) business routes and one other that was deleted. Ohio has three business routes for I-75. Nine other I-75 business routes also exist, or have existed, in Michigan, and a 10th has been proposed.

A total of at least sixteen special routes of U.S. Route 460 exist and at least six have been deleted.

Interstate business routes are roads connecting a central or commercial district of a city or town with an Interstate bypass. These roads typically follow along local streets often along a former U.S. Route or state highway that had been replaced by an Interstate. Interstate business route reassurance markers are signed as either loops or spurs using a green shield shaped and numbered like the shield of the parent Interstate highway.

Dozens of business routes of Interstate 84 (I-84) exist. The existing and former business routes are located along the western and eastern segments of I-84.

Business routes of Interstate 70 (I-70) exist in three states, though historically they have existed in five. Utah and Missouri each have three existing I-70 business routes. Business routes in Kansas have either been proposed and rejected or decommissioned. Another 13 I-70 business routes also exist in Colorado and four others have also existed in the past, leading to a grand total of 17 within the Centennial State.

References

↑ Division of Design (May 7, 2012). "Highway Design Manual, Chapter 20, Index 21.2" (PDF). California Department of Transportation. p. 3. Retrieved September 9, 2014.
↑ Kurumi entry (I-115 to I-515)
↑ "Interstate 315 Montana @ Interstate-Guide.com" . Retrieved September 24, 2007. (has pictures showing that I-315 is signed as BL 15)
↑ "Nevada State Maintained Highways, Descriptions, Index and Maps". Archived from the original on January 24, 2008. Retrieved October 8, 2008.

External links

Interstate Business Route 15 (InterstateGuide.com)

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[CA_design-1] Division of Design (May 7, 2012). "Highway Design Manual, Chapter 20, Index 21.2" (PDF). California Department of Transportation. p. 3. Retrieved September 9, 2014.

[2] Kurumi entry (I-115 to I-515)

[3] "Interstate 315 Montana @ Interstate-Guide.com" . Retrieved September 24, 2007. (has pictures showing that I-315 is signed as BL 15)

[state_maintained-4] "Nevada State Maintained Highways, Descriptions, Index and Maps". Archived from the original on January 24, 2008. Retrieved October 8, 2008.

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v t e Auxiliary routes of Interstate 15
California 15E ¹ 215 Nevada 215 515 Utah 215 415 ¹ Idaho 15W ¹ Montana 115 315 ² Business
¹Former ²Unsigned