Interstate 15 in Nevada
|Maintained by NDOT|
|Length:||123.77 mi (199.19 km)|
|South end:||I-15 at California state line|
| I-215 / CC 215 in Enterprise
I-515 / US 93 / US 95 in Las Vegas
CC 215 in North Las Vegas
US 93 near North Las Vegas
|North end:||I-15 at Arizona state line|
In the U.S. State of Nevada, Interstate 15 begins in Primm, continues through Las Vegas and it crosses the border with Arizona in Mesquite. The freeway runs entirely in Clark County. Many motorists use Interstate 15 to visit Las Vegas, as it is the only primary Interstate Highway in the city. The highway was built along the corridor of the older U.S. Route 91 and Arrowhead Trail, eventually replacing both of these designations.
Route description 
Once Interstate 15 leaves Primm, the route travels north through the desert with few services. The highway then enters the Las Vegas urban area upon passing the State Route 146 (Saint Rose Parkway) interchange. Quickly thereafter, the interstate meets Interstate 215, or the Southern Beltway Interchange, which provides access to Henderson and McCarran International Airport. Originally, this interchange was termed Son of Spaghetti Bowl by the Las Vegas Review-Journal when the interchange was built.
Interstate 15 travels along the west side of the Las Vegas Strip corridor and just west of downtown Las Vegas just before its junction with Interstate 515 and U.S. Route 95 (the "Spaghetti Bowl" interchange). Then the interstate enters North Las Vegas and continues to run roughly parallel to Las Vegas Boulevard (old US 91) as it leaves the Las Vegas urban limits near the northern junction with the Clark County 215 beltway.
Once Interstate 15 leaves North Las Vegas, the freeway travels northeast and crosses the Muddy River at Glendale and then climbs up onto the Mormon Mesa. At Mesquite, the freeway then crosses the Arizona state line and cuts through the extreme northwestern corner of Arizona through the Virgin River Gorge before entering Utah.
Early routes 
The general location of the Interstate 15 corridor through Nevada can be traced as far back as the early 1900s. Regular automobile travel through southern Nevada was established by 1914 along the Arrowhead Trail, a road connecting Los Angeles and Salt Lake City. In 1919, the Nevada Legislature amended its newly-adopted highway law to add State Route 6, which was described as "Commencing at the Arizona line near Mesquite and running southwesterly over what is now known as the Arrow Head [sic] trail through Las Vegas to Jean, Nevada." Two years later, the route was revised to pass through Las Vegas and head "via Jean or Goodsprings to a junction with the California state highway system."
U.S. Route 91 was later proposed as part of the original 1925 U.S. Highway System plan. As originally proposed, US 91 would have followed SR 6 southwest from Mesquite to downtown Las Vegas, where it would then turn southeast along State Route 5 to California via Searchlight. The revised 1926 plan had proposed US 91 follow SR 6 through Las Vegas and Jean to the California state line. Nevada's 1927 official highway map reflects the routing of the final 1926 plan; however, a few maps from the era indicate the original proposal.
US 91/SR 6 began at Primm and followed the Los Angeles Highway towards Las Vegas. Within the city limits, it ran along Fifth Street (now Las Vegas Boulevard) through downtown and into North Las Vegas, where it departed from 5th at Main Street. Exiting the Las Vegas area to the northeast, US 91 became the Salt Lake Highway and then headed towards Apex and Glendale. The highway then curved east-northeast before following present-day SR 170 through Riverside and Bunkerville into Mesquite. US 91 was routed through that city on Mesquite Boulevard, Sandhill Boulevard and Fairview Avenue before crossing the Arizona state line. By 1929, the alignment of US 91/SR 6 was graded throughout much of the state, a distance of 129.5 miles (208.4 km).
The route eventually gained two other highway overlaps. U.S. Route 466 was christened in 1934, and was routed concurrently along US 91 from California to downtown Las Vegas before heading southeast to Hoover Dam (the route was deleted in 1971). Also, in 1936, U.S. Route 93 was extended from its 1932 southern terminus at Glendale, over US 91 to downtown Las Vegas on its way to Hoover Dam.
Interstate development 
A new alignment of US 91 was completed in 1955. This bypassed both Bunkerville and Mesquite to the northwest, along what would become the future path of Interstate 15. The original alignment through Bunkerville is now SR 170.
The passage of the Interstate Highway Act in 1956 quickly brought upgrades to the US 91 corridor. The first section of the newly-designated Interstate 15 opened by 1960. This stretch extended from the California state line to just north of Sloan. In 1963, the new freeway reached the south end of the Las Vegas Valley at Blue Diamond Road, and more than 20 miles (32 km) south of Glendale was also finished. By 1967, I-15 had been constructed along the entire length of US 91 except through parts of Las Vegas and near Mesquite.
The final sections of I-15 to be completed were in North Las Vegas and near the Arizona state line. Both of these sections were completed in 1974. The US 91 designation, which had remained on its original alignment during the construction of the interstate, was made redundant by the new freeway and was removed in 1974.
Between Las Vegas and the Nevada state line, the Nevada Department of Transportation added callboxes at one-mile (1.6 km) intervals in the mid-2000s, used for motorists who end up with vehicle problems and don't have access to a cell phone. This was done as part of a larger project that expanded this portion of the freeway to three travel lanes in each direction to coordinate with a similar effort in California.
Exit list 
The entire route is in Clark County.
|Jean||12.63||20.33||12||SR 161 – Jean, Goodsprings|
|27||SR 146 (Saint Rose Parkway) / Southern Highlands Parkway – Henderson, Lake Mead|
|31||Silverado Ranch Boulevard|
|33.55||53.99||33||SR 160 (Blue Diamond Road) – Pahrump||Northbound entrance from westbound Blue Daimond Road via exit 34 collector/distributor|
|34.85||56.09||34||I-215 east / CC 215 west / Las Vegas Boulevard – McCarran Airport, Henderson||Northbound exit is via collector/distributor beginning near exit 33|
|36.39||58.56||36||Russell Road (SR 594), Frank Sinatra Drive||No southbound access to/from or northbound entrance from Frank Sinatra Drive; southern terminus of express lane|
|37.40||60.19||37||Tropicana Avenue (SR 593), Frank Sinatra Drive – UNLV||No southbound access to/from or northbound entrance from Frank Sinatra Drive|
|38.35||61.72||38||Flamingo Road (SR 592)||Signed as exits 38A (west) and 38B (east) southbound|
|39.16||63.02||39||Spring Mountain Road|
|Las Vegas||40.55||65.26||40||Sahara Avenue (SR 589)||Northern terminus of express lane|
|41.75||67.19||41||SR 159 (Charleston Boulevard)||Signed as exits 41A (east) and 41B (west/Grand Central Parkway) northbound|
|42.89||69.02||42||I-515 south / US 93 south / US 95 / Martin L. King Boulevard – Reno, Downtown Las Vegas, Phoenix||Signed as exits 42A (north) and 42B (south) northbound; south end of US 93 overlap|
|43.47||69.96||43||D Street||Northbound exit and southbound entrance; connected by frontage roads to exit 44 ramps|
|43.60||70.17||44||Washington Avenue (SR 578)||Southbound exit and northbound entrance; connected by frontage roads to exit 43 ramps|
|North Las Vegas||44.72||71.97||45||Lake Mead Boulevard (SR 147)|
|46.45||74.75||46||Cheyenne Avenue (SR 574)|
|48.44||77.96||48||Craig Road (SR 573)|
|50.15||80.71||50||Lamb Boulevard (SR 610)|
|52||CC 215 west|
|53.65||86.34||54||Speedway Boulevard, Hollywood Boulevard||Serves Las Vegas Motor Speedway|
|58.16||93.60||58||SR 604 – Apex, Nellis AFB|
|64.31||103.50||64||US 93 north (Great Basin Highway) – Pioche, Ely||North end of US 93 overlap|
|75.70||121.83||75||Valley of Fire, Lake Mead||Located in Moapa River Indian Reservation|
|90.86||146.22||90||SR 168 – Glendale, Moapa||Southbound exit and northbound entrance are both via exit 91|
|91.63||147.46||91||Glendale, Moapa||No southbound entrance|
|93.91||151.13||93||SR 169 – Logandale, Overton|
|112.03||180.29||112||SR 170 – Riverside, Bunkerville|
|Mesquite||120.37||193.72||120||West Mesquite (I-15 Bus. north)|
|122.92||197.82||122||East Mesquite (I-15 Bus. south)|
- "Route Log- Main Routes of the Eisenhower National System of Interstate and Defense Highways - Table 1". Fhwa.dot.gov. 2002-10-31. Retrieved 2013-01-26.
- Interstate 15 projects pile up on www.lvrj.com
- "Arrowhead Trail (1914-1924)". State Historic Preservation. Nevada Department of Cultural Affairs. 2008. Retrieved 2009-06-07.[dead link]
- Statutes of the State of Nevada Passed at the Twenty-Ninth Session of the Legislature. Carson City, Nevada: State Printing Office. 1919. pp. 23–24. Retrieved 2009-06-02.[dead link]
- Statutes of the State of Nevada Passed at the Thirtieth Session of the Legislature. Carson City, Nevada: State Printing Office. 1921. pp. 383–384. Retrieved 2009-06-02.[dead link]
- Droz, Robert V. (2003-02-24). "1925 US Highway Plan". U.S. Highways: from US 1 to (US 830). Retrieved 2009-06-02.
- Droz, Robert V. (2005-02-28). "US Highways in 1927". U.S. Highways: from US 1 to (US 830). Retrieved 2009-06-02.
- Nevada Department of Highways (1927). Highway Map of the State of Nevada (Map). 1 in. = 25 mi.. http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=567&CISOSHOW=455. Retrieved 2009-06-03.
- Rand McNally and Co. (1927). Rand McNally Junior Auto Map (Map).
- Nevada Department of Highways (1929). Highway Map State of Nevada (Map). 1 in. = 25 mi.. http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=568&CISOSHOW=457. Retrieved 2009-06-03.
- Nevada State Highway Department (1934). Official Road Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=571&CISOSHOW=463. Retrieved 2009-06-03.
- Nevada Department of Highways (1939). Official Road Map of the State of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=575&CISOSHOW=471. Retrieved 2009-06-03.
- Nevada Department of Highways (1955). Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=589&CISOSHOW=499. Retrieved 2009-06-03.
- Nevada State Highway Department (1960). 1960 Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=594&CISOSHOW=509. Retrieved 2009-06-03.
- Nevada State Highway Department (1963). 1963-1964 Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=596&CISOSHOW=513. Retrieved 2009-06-03.
- Nevada State Highway Department (1967). 1967 Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=598&CISOSHOW=517. Retrieved 2009-06-03.
- Nevada State Highway Department (1973). 1973 Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=604&CISOSHOW=529. Retrieved 2009-06-03.
- Droz, Robert V. (2008-10-29). "North–South Routes - US 1 to US 101". U.S. Highways: from US 1 to (US 830). Retrieved 2009-06-03.
- Nevada State Highway Department (1975). 1975 Official Highway Map of Nevada (Map). http://contentdm.library.unr.edu/cdm4/document.php?CISOROOT=/hmaps&CISOPTR=605&CISOSHOW=531. Retrieved 2009-06-03.
- Nevada Interchanges & Structures: I-15. Nevada Department of Transportation. January 1998.
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