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'Interstate 8' (abbreviated '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^[1], 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 wide.

Contents

Route description

California

Arizona

Major intersections

References

Route description

|-
|CA
|172
|277
|-
|AZ
|178.33
|287
|-
|Total
|350.33
|564
|}

Major cities 'Bolded cities' are officially-designated control cities for signs
★ 'San Diego, California' ★ 'El Centro, California' ★ 'Yuma, Arizona' ★ 'Phoenix, Arizona' (via AZ 85) ★ 'Tucson, Arizona' (via I-10)

California

Main articles: 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).

Arizona

Main articles: 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).

Major intersections

★ Interstate 5 in San Diego, California ^[3]

★ Interstate 805 in San Diego, California

★ Interstate 15 in San Diego, California

★ Interstate 10 in Casa Grande, Arizona

References

1. map
2. map
3. Map