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Interstate 15
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==Route description== {{lengths table|length_ref=<ref name="USDOT"/>}} |- |[[Interstate 15 in California|CA]] |{{convert|287.26|mi|km|disp=table}} |- |[[Interstate 15 in Nevada|NV]] |{{convert|123.77|mi|km|disp=table}} |- |[[Interstate 15 in Arizona|AZ]] |{{convert|29.39|mi|km|disp=table}} |- |[[Interstate 15 in Utah|UT]] |{{convert|401.07|mi|km|disp=table}} |- |[[Interstate 15 in Idaho|ID]] |{{convert|196.00|mi|km|disp=table}} |- |[[Interstate 15 in Montana|MT]] |{{convert|396.03|mi|km|disp=table}} |- |Total |{{convert|1433.52|mi|km|disp=table}} |} {{multiple image | direction = vertical | width = 250 | image1 = Interstate15 Ivanpah Valley.jpg | caption1 = Northbound I-15 makes a steep descent from the Mountain Pass into the [[Ivanpah Valley]] | image2 = Interstate_15,_Las_Vegas,_South_of_Flight_Path_on_Departure_(14203692275).jpg | caption2 = Aerial view of I-15 looking south from Sunset Road in the [[Las Vegas Valley]] | image3 = Red rock cliff walls in Virgin River Gorge.jpg | caption3 = I-15 passes through the [[Virgin River]] Gorge, Arizona, revealing scenic reddish brown cliffs | image4 = Interstate 15 Arizona.jpg | caption4 = I-15 in Arizona | image5 = I-15indowntown.jpg | caption5 = I-15 in [[Salt Lake City]] | image6 = I 15 US 20 Junction Sign.jpg | caption6 = I-15/US 20 Jct. in [[Idaho Falls, Idaho]] | image7 = Interstate15ruralMT.jpg | caption7 = I-15, {{Convert|20|mi|km}} south of [[Dillon, Montana]] | image8 = greatfallscitylights.jpg | caption8 = I-15 (foreground left to right) goes through [[Great Falls, Montana]] }} This highway's southern terminus is in [[San Diego|San Diego, California]], at [[Interstate 8|I-8]], although via [[California State Route 15|SR 15]], a southern extension of the freeway, the route connects to [[Interstate 5|I-5]] 12.5 miles from the US/Mexico border in southern San Diego.<ref name=sr15reconstruction>{{cite book |publisher = [[California Department of Transportation]] |date = December 2010 |title = State Route 15: Mid-City Bus Rapid Transit Project |page = 1 }}</ref> The northern terminus is in [[Sweet Grass, Montana]], at the Canada–US border, where it becomes [[Alberta Highway 4]]. It is {{convert|1433|mi|km|0}} long from San Diego to Sweet Grass. ===California=== {{Main|Interstate 15 in California}} North of its junction with [[California State Route 91|SR 91]] in [[Corona, California|Corona]], the route roughly follows the former routes of State Route 31. North of [[Devore, California|Devore]], the highway follows the approximate alignment of historic [[U.S. Route 66|US Route 66]] along with [[U.S. Route 91|US 91]] and [[U.S. Route 395|US 395]]. US 395 breaks away at Hesperia and the route continues on a direct path to [[Barstow, California|Barstow]] {{convert|35|mi|km|0}} to the north. Meanwhile, the old alignments of US 91 and US 66 follow the [[Mojave River]] from [[Victorville, California|Victorville]] to Barstow along the [[National Old Trails Road|National Trails Highway]]. At that point, I-15 follows the old route of US 91 exclusively as US 66 turned east toward [[Needles, California|Needles]]. For many parts of the highway, high-voltage [[electric power transmission|powerline]]s, such as [[Path 46]] and [[Path 27]], almost all originating from the [[Hoover Dam]], follow the freeway. Many of these link distant power stations to the [[Los Angeles]] metropolitan area. The southern starting point of I-15 was in 1957 planned to be in [[San Bernardino, California|San Bernardino]], at the interchange with the San Bernardino Freeway (then US 70/US 99, now [[Interstate 10|I-10]]). This was logical as I-15 was following the old alignment of the historic Route 66 which passed through San Bernardino. The segment was completed accordingly. In 1964, legislation was later passed to extend the Interstate to [[San Diego]]. Instead of extending the existing freeway from the I-10 interchange south, however, the [[California Department of Transportation]] drew 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 {{convert|13|mi|km|0}}. Then, in [[Rancho Cucamonga, California|Rancho Cucamonga]], its directional alignment shifts to north–south where it eventually meets with I-10 (about {{convert|15|mi|km}} 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 renumbered as [[Interstate 215 (California)|I-215]]. Note that during the construction of I-15's present alignment, and for some time afterward, I-215 was numbered as I-15E, and its actual mileage would begin at I-10. I-15 runs for a total of {{convert|287|mi|km|0}} in California. ===Nevada=== {{Main|Interstate 15 in Nevada}} I-15 begins in [[Primm, Nevada|Primm]] and continues through [[Las Vegas]] along the [[Las Vegas Strip]] corridor. Then, the Interstate crosses the border with [[Arizona]] in [[Mesquite, Nevada|Mesquite]]. The Interstate in [[Nevada]] runs entirely in [[Clark County, Nevada|Clark County]], for a distance of {{convert|123.8|mi|km|0}}. ===Arizona=== {{Main|Interstate 15 in Arizona}} I-15 passes through the [[Arizona Strip|northwestern corner]] of [[Arizona]] with a total length of {{convert|29.4|mi|km|0}}.<ref>Arizona Department of Transportation Project 015 MO 000 H577901C, sheet 73 of 103 - revised May 2005</ref> The stretch is separated from the rest of the state and has one major exit, at [[Beaver Dam, Arizona|Beaver Dam]]/[[Littlefield, Arizona]]. It includes a spectacular section where the road twists between the narrow walls of the [[Virgin River Gorge]]. ===Utah=== {{Main|Interstate 15 in Utah}} I-15 continues through [[Utah]] for {{convert|401|mi|km|0}}. It is the main north–south connection for the state. The highway approximately follows the old alignment of [[U.S. Route 91|US 91]] from [[St. George, Utah|St. George]] to [[Brigham City, Utah|Brigham City]]. The highway passes through the fast-growing [[Utah's Dixie]] region in the southwestern part of the state, which includes [[St. George, Utah|St. George]], [[Cedar City, Utah|Cedar City]], and eventually most of the major cities and suburbs along the [[Wasatch Front]], including [[Provo, Utah|Provo]], [[Orem, Utah|Orem]], [[Sandy, Utah|Sandy]], [[Salt Lake City]], [[Layton, Utah|Layton]], and [[Ogden, Utah|Ogden]]. Near [[Cove Fort, Utah|Cove Fort]], [[Interstate 70 in Utah|I-70]] begins its journey eastward across the country. The Interstate [[Concurrency (road)|merges]] with [[Interstate 80 in Utah|I-80]] for about {{convert|3|mi|km|0}} from [[South Salt Lake, Utah|South Salt Lake]] to just west of [[Downtown Salt Lake City]] and also merges with [[Interstate 84 in Utah|I-84]] from [[Ogden, Utah|Ogden]] to [[Tremonton, Utah|Tremonton]]. Along nearly its entire length through the state, I-15 winds its way along the western edge of a nearly continuous range of mountains (the [[Wasatch Range]] in the northern half of the state). The only exceptions are north of [[Cove Fort, Utah|Cove Fort]] and when it passes between [[Cedar City, Utah|Cedar City]] and St. George, known as the Black Ridge, a transition zone of drastic change in elevation and climate, an area where the eastern [[Great Basin]], [[Colorado Plateau]], and [[Mojave Desert]] converge. ===Idaho=== {{Main|Interstate 15 in Idaho}} I-15 passes through [[Idaho]] for {{convert|196|mi|km|0}}. I-15 crosses the [[Utah]] state line in [[Oneida County, Idaho|Oneida County]]. The highway runs through [[Pocatello, Idaho|Pocatello]], [[Blackfoot, Idaho|Blackfoot]], and [[Idaho Falls, Idaho|Idaho Falls]], intersecting with [[Interstate 86 (west)|I-86]]. The last county in Idaho that I-15 passes through is [[Clark County, Idaho|Clark County]]. Finally, the Interstate reaches the [[Montana]] state line at [[Monida Pass]]. ===Montana=== {{Main|Interstate 15 in Montana}} I-15 continues onward through {{convert|396|mi|km|0}} of [[Montana]] through the cities of [[Butte, Montana|Butte]], [[Helena, Montana|Helena]], and [[Great Falls, Montana|Great Falls]], intersecting with [[Interstate 90 in Montana|I-90]], [[I-115]], and [[I-315]]. At [[Sweet Grass, Montana|Sweet Grass]], I-15 terminates upon [[Sweetgrass–Coutts Border Crossing|crossing the Canadian border]] into the province of [[Alberta]]; however, I-15 signage is present on [[Alberta Highway 4]] southbound from [[Lethbridge]] to the [[Canada–United States border|Canadian border]].
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