Mission Valley Freeway / Kumeyaay Highway
Runs from Sunset Cliffs Blvd in San Diego to Winterhaven, CA and to Casa Grande, AZ (I-10)
This freeway serves as the sole freeway connection east for the San Diego area. Running from near the beaches, over a mountain range, and through the Imperial Desert, it is indeed a route with varied terrain. As a result of these differences, I-8 holds a couple of records for Interstates. It has the tallest bridge on the Interstate system, at 440′ above the canyon floor. It also has the lowest point on the Interstate system, at about -72 feet at the crossing of the New River near Seeley.
The route, in California, follows former US 80 and was completed about 1975.