Interstate 15

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Interstate 15, or I-15, is an interstate highway in the western United States. Its odd (as opposed to even) number indicates that it is primarily a north-south highway. It goes from San Diego, California just south of Interstate 8 (where it becomes California State Route 15) to Sweetgrass, Montana at the Canadian border. North of its junction with California State Route 91 in the Inland Empire near Corona, the route follows (roughly) the old US Route 91.

It is planned by CalTrans that this highway will be extended south to Interstate 5 along CA 15 to San Diego's Barrio Logan district once necessary upgrades to CA 15 are completed. Note there are three bypasses and loops identified as Interstate 215: in the Inland Empire region of California; in Las Vegas, Nevada; and in Salt Lake City, Utah.

From the junction of Limonite Avenue to the northern junction with the I-215 spur, this freeway is named the Ontario Freeway. From the northern I-215 junction to the Nevada state line, this freeway is called the Mojave Freeway. Across the Miramar Marine Corps Air Station it is called the Semper Fi Freeway.

Table of contents

1 Length

2 Major Cities Along the Route

3 Intersections with other Interstates

4 Spur Routes

5 Notes

6 Reference

Length


Miles	km	state
292	473	California
124	201	Nevada
29.40	47.63	Arizona
401	650	Utah
196	318	Idaho
396	642	Montana

1,438.40	2,330.21	Total

Major Cities Along the Route

Intersections with other Interstates

Interstate 8 in San Diego, California
Interstate 10 in Ontario, California
Interstate 40 in Barstow, California
Interstate 70 in Cove Fort, Utah
Interstate 80 in Salt Lake City, Utah
The western Interstate 84 in Ogden, Utah. They stay merged until Tremonton, Utah.
The western Interstate 86 in Pocatello, Idaho
Interstate 90 in Butte, Montana. They are merged for 9 miles.

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

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 half of I-86 was once called I-15W.

I-215 around Salt Lake City was once known as I-415.

I-15 ends at the border between Montana and Alberta, where it becomes AB Provincial Highway 4. This route can be used to go into the cities of Calgary and Edmonton.

Reference

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

Primary Interstate Highways

4	5	8	10	12	15	16	17
19	20	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	77
78	79	80	81	82	83	84	85
86	87	88	89	90	91	93	94
95	96	97	99	238	H-1	H-2	H-3
A-1	A-2	A-3	A-4	PRI-1	PRI-2	PRI-3

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