I-15/I-215 Devore Interchange Improvements


California Department of Transportation

Completion Date



URS Corporation


San Bernardino, California

Delivery Method




Contract Value

$ 208 million
I-15/I-215 Devore Interchange

This project improved safety and reduced traffic congestion by adding a new lane in each direction and creating 2 miles of truck bypass lanes. Additionally, it involved constructing a new I-15 mainline northbound connector to restore route continuity and address operational challenges related to truck weaving. The scope of work included extensive drainage infrastructure, construction over three railroad tracks, and significant environmental permit requirements associated with the Cajon Wash and the preservation of a protected species— the Kangaroo Rat.

The project team successfully executed the construction of nine new bridges, widened nine existing ones, and erected 19,793 linear feet of retaining walls, collectively spanning over 317,000 square feet. The project also reconnected the historic Route 66 highway, which had been severed during the construction of the original interchange four decades earlier.

During procurement, the Atkinson team optimized the design to provide the best overall project for the California Department of Transportation, the environment, the community, and corridor users. This allowed Atkinson to deliver the project more efficiently, safely, at a lower cost, and four months early.

Notable accomplishments included a 20 percent reduction in bridge construction, a 10 percent reduction in earthwork cuts, the elimination of imported borrow fill material, and a reduction in required right of way by over 12 acres, preserving eight private residences.

The phasing and sequencing plan strategically enabled the majority of construction to take place during daylight hours, away from the main I-15 route and behind concrete barriers. This significantly reduced traffic impacts to I-15—a critical link in goods movement from the Ports of Los Angeles and Long Beach that—combined—are the busiest ports in the United States of America.