SR-91 (I-5 to SR-57) Westbound Lane Addition Project

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SR-91 (I-5 to SR-57) Westbound Lane Addition Project

Project Overview – New Lane, Added Capacity, Improved Driving Conditions
OCTA and Caltrans are working together to add a new, four-mile westbound general purpose lane to State Route 91 between State Route 57 and Interstate 5. The new westbound lane will increase capacity, improve driving operations and relieve traffic congestion along this key stretch of westbound SR-91.

Project Fact Sheet

Closures & Detours
Nightly closures are plotted on a Google Map which includes specific closure times as well as recommended detours. Closures are updated in real time and can be accessed by clicking the image below or visiting This interactive map is easily accessible on your smart phone or you can bookmark the page on your computer.

As part of this project, lane or full freeway closures during peak hours will not be required, unless an urgency or emergency arises. Full closures of local streets will be limited to erect new bridge structures and will occur during off-peak hours.

Also, the number of general purpose lanes within the project limits will remain the same before and during construction. However, in many locations existing auxiliary and emergency shoulders have been eliminated to provide crews the safety and space required to perform lane, shoulder and bridge work.

It is also important to note that there will be day and night ramp closures as required. These closures are necessary to provide for the safety of commuters and crews alike during ramp realignment work. Ramp closures will not happen concurrently.

SR-91 Weekly Closures
Google Detour Map Tutorial

Construction Highlights

On May 1, 2013, OCTA and Caltrans broke ground on this third in a series of 91 freeway improvement projects. Anaheim-based C.C. Myers, Inc. was awarded the construction contract after submitting the lowest, responsive bid. Construction is expected to last approximately two (2) years, with completion estimated for early 2016. In addition to building a new westbound general purpose lane, construction crews will also:

  • Widen six bridges
  • Realign nine ramps
  • Erect new signage and safety barriers
  • Re-stripe and standardize lanes and shoulders within the project limits


As part of the project, construction crews are widening six bridges in the westbound direction at: State College, Acacia Avenue, Raymond Avenue, Metrolink Crossing, Euclid Street, and Brookhurst Street. In an effort to maximize safety and minimize traffic impacts, demolition work of overpasses took place during the night and required the closure of State College Boulevard, Acacia Street, Raymond Avenue, Euclid Street and Brookhurst Road at the freeway from approximately 10 p.m. to 5 a.m. In most cases, the work took between 2 – 3 nights to complete. With the demolition work now finished, crews are completing bridge widening activities, including constructing piles, bents and abutments.


More than 10 retaining and/or sound walls will be built between State College Boulevard and Brookhurst Road as part of this project. Crews have demolished several walls, including at: Acacia Street, adjacent to Houston Avenue between Euclid Street and Brookhurst Road, and along the westbound 91 on-ramp at Brookhurst Road. The purpose of demolishing these and other walls is to make room for the new lane and emergency shoulder by constructing a new wall – of equal or greater height – located approximately twelve (12) feet to the north.

Houston Channel

Construction crews have reconstructed a limited section of the Houston Channel between Euclid Street and Brookhurst Road. Owned and operated by the Orange County Flood Control District (OCFCD), the Houston Channel is a storm drain facility that runs above ground along the northern side of the 91 Freeway. To make room for the new lane and shoulder, crews reconstructed this portion of the channel underground with the carrying capacity required by the OCFCD.

Project Funding -
Funding for the $64 million freeway improvement project comes from state and local sources, including Orange County’s Measure M and the State of California’s Transportation Corridor Improvement Fund (TCIF).

  • Planning/Environmental = $1.4 million
  • Engineering/Right of Way = $14.0 million
  • Construction = $47.4 million

Community Engagement
The 91 Outreach Team is available to make a presentation to your neighborhood, organization or business. Feel free to contact us with your request, questions or comments by email, phone or social media. You can also stay informed by visiting this page on a recurring basis, joining the project email list, going to the project map at or following @91fwy on Twitter.

Contact the Outreach Team

For questions, please contact Fernando Chavarria, Manager of Community Outreach, or Andrea Hamman, Associate Community Relations Specialist.

Fernando Chavarria
Manager of Community Outreach
(714) 560-5306

Andrea Hammann
Associate Community Relations Specialist
(714) 560-5573
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