Interstate 15

From Wikipedia, the free encyclopedia.

I-15 redirects here. For the Soviet fighter aircraft , see Polikarpov I-15.

Interstate 15 Primary Interstate Length: 1435 mi (2307 km) Major cities/towns: San Diego, CA Escondido, CA Temecula, CA Lake Elsinore, CA Corona, CA Ontario, CA Rancho Cucamonga, CA Victorville, CA Barstow, CA Las Vegas, NV North Las Vegas, NV Mesquite, NV St. George, UT Cedar City, UT Beaver, UT Fillmore, UT Nephi, UT Provo, UT Salt Lake City, UT Bountiful, UT Odgen, UT Pocatello, ID Idaho Falls, ID Dillon, MT Butte,MT Helena, MT Great Falls, MT Sweetgrass, MT Established: {{{year_established}}} Direction: North-South Southern Terminus: San Diego, CA Northern Terminus: Sweetgrass, MT States traversed: California Nevada Arizona Utah Idaho Montana INTERSTATE JUNCTIONS JUNCTION EXIT # I-5 CA 0 I-805 CA 3 I-8 CA 6 I-215 CA 63 I-10 CA 109 I-215 CA 123 I-40 CA 184 I-215 NV 34 I-515 NV 42 I-70 UT 132 I-215 UT 302 I-80 UT 308 UT 311 I-215 I-84 UT 382 I-86 ID 72 I-90 MT 121 MT 129 Canadian Border MT 394 Legend   deleted (no longer in system)   unconstructed   closed   crossing with no access   begin/end concurrency, bold route is carried through   a bold route on white background indicates termini. BROWSE STATE HWYS Prev Next CA-15 CA-16

Interstate 15 (abbreviated I-15) is the fourth longest north-south transcontinental interstate highway in the United States, traveling through the states of Montana, Idaho, Utah, Arizona, Nevada, and California. In California, this freeway is a major transportation corridor linking the San Diego-Carlsbad-San Marcos Metropolitan area with the Riverside-San Bernardino-Ontario Metropolitan area, and various suburban communities between them. It is also the main artery of transportation through the Salt Lake City Metropolitan area. It also serves as the primary access route from Southern California to Las Vegas, Nevada, a major travel/tourist destination throughout the year. More recently, I-15 has begun to serve as a heavily traveled commuter route between the Mojave Desert communities of Victorville, Hesperia, Apple Valley, and Adelanto in California, due to rapid population growth and associated residential, commercial, and industrial development.

Route Summary

This highway's beginning is in San Diego, California at Harbor Drive. The northern terminus is at Sweetgrass, Montana at the international border between the United States and Canada.

California

North of its junction with the Riverside Freeway, California State Route 91 (CA/SR-91), in the Inland Empire near Corona, the route follows (roughly) the old U.S. Highway 91. North of Devore, California the highway follows the approximate alignment of historic U.S. Highway 66 until about the Mojave River 35 miles (56 km) to the north.

Interestingly, the starting point of Interstate 15 was originally planned to be in San Bernardino at an interchange with the San Bernardino Freeway, Interstate 10 (I-10). This was logical as I-15 was following the old alignment of the historic route U.S. Route 66 which passed through San Bernardino. The segment was completed accordingly. However, legislation was later passed to extend the interstate to San Diego. But instead of extending the existing freeway from the I-10 interchange south, the California Department of Transportation created a new segment in Devore that 'branched' off of the original alignment and bypassed San Bernardino altogether. This segment's alignment is generally northeast to southwest for about 15 miles (24 km). Then, in Fontana/Rancho Cucamonga, California, its directional alignment shifts to north-south where it eventually junctions with Interstate 10 (about 15 miles west of the original interchange in San Bernardino). The segment that had been built from Devore to San Bernardino was retained as an interstate, but was re-numbered as Interstate 215. Note that during the construction of I-15's present alignment, and for some time afterwards, I-215 was numbered as I-15E.

See Interstate 215 (California)

There are three bypasses and loops identified as Interstate 215: in the Inland Empire region of California, Las Vegas, and Salt Lake City.

In California, I-15 has at least five different names throughout its length. From its beginning to the Riverside/San Diego county line, it is named the Escondido Freeway. The portion of the Escondido Freeway passing through the Marine Corps Air Station at Miramar is also known as the Semper Fi Highway. From the San Diego county line to California State Route 74 (the Ortega Highway) in Lake Elsinore, it is named the Temecula Valley Freeway. From CA/SR-74 to Limonite Avenue in Riverside County, it is known as the Corona Freeway. From Limonite Avenue to the northern junction with I-215 spur in Devore, it is named the Ontario Freeway. From the northern I-215 junction to the Interstate 40 junction in Barstow, California, it is named the Barstow Freeway. Finally, from Barstow to the California/Nevada state line it is named the Mojave Freeway.

State Law

Legal Definition of Route 15: California Streets and Highways Code, Chapter 2, Article 3, Section 304

Route 15 is part of the Freeway and Expressway System, as stated by section 253.1 of the California State Highway Code.

Route 15 is part of the Scenic Highway System, as stated by section 263.2 of the California State Highway Code.

Length

Major cities along the route

Location of Interstate 15

Northbound, I-15 makes a steep descent from Mountain Pass into the Ivanpah Valley. In the middle distance, the casinos of Primm straddle the freeway right at the Nevada border, while those of Jean are further off, to the left; Las Vegas is immediately on the far side of the hills on the horizon.

• San Diego, California
• Riverside, California, San Bernardino, California and other Inland Empire cities
• Las Vegas, Nevada; North Las Vegas, Nevada
• St. George, Utah
• Provo, Utah
• Salt Lake City, Utah
• Ogden, Utah
• Pocatello, Idaho
• Idaho Falls, Idaho
• Butte, Montana
• Helena, Montana
• Great Falls, Montana

Major intersecting freeways and highways

Listed in order from south to north:

California

• Mission Valley Freeway in San Diego at 32° 46' 43"N, 117° 06' 45"W
• Soledad Freeway in Miramar at 32° 50' 30"N, 117° 07' 14"W
• Cabrillo Freeway in Miramar at 32° 51' 33"N, 117° 06' 48"W
• Ted Williams Freeway near Poway at 32° 57' 53"N, 117° 05' 44"W
• Vista Freeway in Escondido at 33° 07' 38"N, 117° 06' 18"W
• Old Highway 395 near Rainbow Pass
• (surface street) near Fallbrook
• Winchester Road (surface street) in Temecula
• Escondido Freeway in Murietta at 33° 32' 53"N, 117° 10' 50"W
• Ortega Highway (surface street) in Lake Elsinore
• Riverside Freeway in Corona at 33° 52' 54"N, 117° 32' 52"W
• Pomona Freeway in unincorporated Riverside County at 34° 01' 18"N, 117° 33' 01"W
• San Bernardino Freeway in Ontario at 34° 04' 03"N, 117° 32' 42"W
• Foothill Boulevard (surface street) in Rancho Cucamonga
• Foothill Freeway in Rancho Cucamonga at 34° 08' 09"N, 117° 29' 48"W
• Barstow Freeway in Devore at 34° 13' 31"N, 117° 24' 35"W
• Antelope Highway (surface street) in unincorporated San Bernardino County
• (surface street) south of Hesperia
• Palmdale Road/D Street (surface streets) in Victorville
• south of Barstow at 34° 52' 14"N, 117° 04' 36"W
• Barstow Road (surface street) in Barstow
• in Barstow at 34° 53' 11"N, 117° 00' 36"W
• Kelbaker Road (surface street) in Baker

Nevada

• Interstate 215 in unincorporated Clark County (Paradise) near McCarran International Airport
• Interstate 515 in Las Vegas

Arizona

Interstate 15 does not intersect any major roads in Arizona.

Utah

• Interstate 70 in Cove Fort
• Interstate 215 in Murray
• Interstate 80 in South Salt Lake; they merge for about 3 mi (5 km) into Salt Lake City
• Utah State Route 201 in South Salt Lake
• Interstate 215 in North Salt Lake
• Interstate 84 in Ogden; they stay merged until Tremonton

Idaho

• Interstate 86 in Pocatello

Montana

• Interstate 90 in Butte; they are merged for 9 miles (14.5 km)

Spur routes

• Inland Empire, California - I-215
• Spur to Henderson, Nevada outside Las Vegas - I-515
• Beltway Las Vegas, Nevada - I-215
• Salt Lake City, Utah - I-215
• Butte, Montana - I-115
• Great Falls, Montana - I-315

	edit Three-digit Interstates from Interstate 15
I-115	Montana
I-215	California - Nevada - Utah
I-315	Montana
I-515	Nevada
past/ future	I-115: California - I-415: Utah

Notes

• Managed Lanes Project- Initated during fall 2003 and will finished late 2007. Portion of CA-56 to Centre City Pkwy (former US 395). More info in "reference" section; See also high occupancy toll.
• At the time it was built, the section running through the northwest corner of Arizona (the Virgin River gorge) was the most expensive section (per mile) of the entire interstate system.
• The sign for the Zzyzx exit, the alphabetically last place name in the United States, is a well-known landmark along the drive from Los Angeles to Las Vegas on I-15.
• Interstate 15 had an eastern branch bypassing San Bernardino, California, and a western branch in Idaho. I-215 around San Bernardino was I-15E, and the western I-86 was once called I-15W.
• The eastern section of I-215 in Salt Lake City, from the south interchange with I-15 east to I-80, was once known as I-415.
• I-15 ends at the border between Montana and Alberta, where it becomes Alberta provincial highway 4. Combined with Alberta provincial highway 3 and Alberta provincial highway 2, this route can be used to go into the cities of Calgary and Edmonton and other Alberta cities.

Reference and External links

Wikimedia Commons has media related to:

Interstate 15

• http://www.ihoz.com/interstates.html
• http://www.dot.ca.gov/dist11/facts/I-15managed.pdf
• 2005 Rand McNally "The Road Atlas 2005" - newest feature- interstate mileage by state

California

• WestCoastRoads - I-15
• California Highways: CA-15
• The Big Highways Page: California Route 15
• Cal-NExUS: Route 15 North
• Cal-NExUS: Route 15 South

edit Primary Interstate Highways
4	5	8	10	12	15	16	17
19	20	22	24	25	26	27	29
30	35	37	39	40	43	44	45
49	55	57	59	64	65	66	68
69	70	71	72	73	74	75	76 (W)
76 (E)	77	78	79	80	81	82	83
84 (W)	84 (E)	85	86 (W)	86 (E)	87	88 (W)	88 (E)
89	90	91	93	94	95	96	97
99	238	H-1	H-2	H-3
Unsigned Interstate Highways
A-1	A-2	A-3	A-4	PRI-1	PRI-2	PRI-3
Lists Two-digit Interstates - Three-digit Interstates Gaps in Interstates - Intrastate Interstates Interstate standards - Proposed Interstates

This article relating to U.S. Interstate Highways is a stub. Please support the U.S. Interstate Highway WikiProject and help Wikipedia by expanding the stub.