SR-133 Operational Improvements

The California Department of Transportation (Caltrans) proposes an operational improvements project on State Route 133 (SR-133) from 0.2 miles north of Route 133/405 separation (PM 8.3) to Irvine Center Drive Overcrossing (PM M9.3) in the City of Irvine, in the County of Orange. The project proposes to construct new auxiliary lane on southbound (SB) SR-133 from NB I-405 connector to SB I-5 connector. This new aux lane will become the 2nd lane on NB I-405 connector. The number 3 lane on SB SR-133 will be extended approximately 300 feet south of San Diego Creek to match existing roadway pavement. The purpose of the project is to enhance traffic operations and improve traffic flow.

Information in the Initial Study (with proposed Mitigated Negative Declaration) and Section 4(f) De Minimis Determination Analysis focuses on the environmental impact evaluation and proposed avoidance, minimization and/or mitigation of potential impacts associated with the proposed Build Alternative.

Anticipated Schedule

  • Project Approval & Environmental Document - April 2020
  • Start of Construction - Spring 2022
  • Opening Year - Summer  2024

If you would like to make a comment during the public review period (January 7, 2020 to February 6, 2020) on the Draft Environmental Document, please send your comment(s) to


Bahar Heydari
Phone (657) 328-6155

Smita Deshpande
Phone (657) 328-6151