I-5 Improvement Project (I-405 to SR-55)

The California Department of Transportation (Caltrans) District 12, in cooperation with the Orange County Transportation Authority (OCTA), proposes to widen Interstate 5 (I-5) between Interstate 405 (I-405) and State Route 55 (SR-55. the project limits on I-5 extend from approximately 0.4 mile (mi) north of the I-5/I-405 Interchange (Post Mile [PM] 21.3) to 0.2 mi south of SR-55 (PM 30.3) in Orange County, California. The project purpose is to reduce traffic congestion by improving traffic operations and meeting existing and future traffic demands.

Information in the Initial Study/Environmental Assessment (IS/EA) focuses on the environmental impact evaluation and proposed avoidance, minimization and/or mitigation of potential impacts associated with the proposed Build Alternatives.

Anticipated Schedule

  • Project Approval & Environmental Document – December 2018
  • Design – July 2022
  • Construction – February 2026


Brian Liu
Phone (657) 328-6135

Smita Deshpande
Phone (657) 328-6151