Interstate 15
San Diego, CA to Sweetgrass, MT
I-15 runs 1,433 miles from the San Diego-Tijuana border north through Las Vegas, Salt Lake City, and Idaho to the Canadian border at Montana. It is a critical corridor linking the Inland Empire distribution zone to the Mountain West and serves as the primary I-80 connection at Salt Lake City. The Cajon Pass descent from the high desert into the Los Angeles basin is one of the most demanding truck grades in the western US, and the Nevada desert segment requires careful fuel and temperature planning.
Length
1433 miles
1433 miles
Risk Rating
MODERATE
MODERATE
Risk Factors
Cajon Pass grades (CA)
Desert heat (NV/UT)
Winter ice (Utah passes)
High crosswinds (Nevada)
Runaway truck risk (Cajon Pass)
Notorious Segments
- Cajon Pass, CA
- Baker Grade (I-15 near Baker, CA)
Connected Hubs
Regions
United States
West
Southwest
California
Nevada
Utah