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Interstate 8 Main route of the Interstate Highway System
Length:	348.25 mi[1] (560.45 km)
Formed:	1964
West end:	Sunset Cliffs Boulevard in San Diego, CA
Major junctions:	I-5 in San Diego, CA I-15 in San Diego, CA
East end:	I-10 near Casa Grande, AZ

Interstate 8 in San Diego, from the San Diego Trolley.

Interstate 8 (I-8) is an Interstate highway in the southwestern United States. It runs from the southern edge of Mission Bay at Sunset Cliffs Blvd. in San Diego, California, almost at the Pacific Ocean, to the junction with Interstate 10, just southeast of Casa Grande, Arizona.^[2] In California, especially from eastern San Diego County to points east, Interstate 8 runs very close to the United States-Mexico border. At points in eastern Imperial County, the border is no more than two miles (3 km) south of the Interstate.

I-8 within the Mountain Springs/In Ko Pah grade has one of the widest medians on the entire Interstate highway system. In places, the median is over 1.5 miles (2.4 km) wide.

[edit] Route description

Please help improve this section by expanding it. Further information might be found on the talk page. (June 2008)

[edit] California

Main article: Interstate 8 in California

Much of I-8 in the Imperial Valley in California runs below sea level; in fact, at the New River near Seeley, CA, I-8 reaches the lowest land elevation in the entire Interstate system at -52 ft. (-16 m).

[edit] Arizona

Main article: Interstate 8 in Arizona

East of Yuma, the eastbound and westbound lanes invert; that is, the carriageways run on the left side of the median for roughly three miles. Throughout the entire length of Interstate 8, it only intersects one U.S. highway (US 95 in Yuma).

[edit] Major intersections

I-10 approaching the eastern terminus of I-8

• Interstate 5 in San Diego, California
• Interstate 805 in San Diego, California
• Interstate 15 in San Diego, California
• Interstate 10 in Casa Grande, Arizona

[edit] References

Wikimedia Commons has media related to: Interstate 8

edit Main Interstate Highways (multiples of 5 highlighted)
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			A-1		A-2		A-3		A-4		PRI-1		PRI-2		PRI-3
Lists		Primary			Main - Intrastate - Suffixed - Future - Gaps
		Auxiliary			Main - Future - Unsigned
		Other			Standards - Business - Bypassed