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SR-91 (SR-57 to SR-55) Improvement Project

Construction Updates

Construction Anticipated to Start Mid-April 2025

Informational Webinar

Construction for Segment 1 of the SR-91 (SR-57 to SR-55) Improvement Project is starting soon! Join our upcoming webinar to get the latest project details and have your questions answered.

Thursday, April 10
Noon to 1 p.m.

register

Stay informed with updates

Sign up for our construction alerts, which will be sent regularly when construction starts, by filling out the Stay Informed form. If you have further questions, please feel free to contact our team and we will be happy to help.

Project Map

project map

Segment 1, SR-91/Lakeview Avenue Interchange


Segment Improvements
  • Reconstruct Lakeview Avenue overcrossing to include standard lanes, shoulders and sidewalks in each direction

  • Realign westbound State Route 91 (SR-91) on-ramp at Lakeview interchange

  • Add new on-ramp from Lakeview connecting directly to SR-55

  • Separate westbound SR-91 and southbound SR-55 traffic

segment 1 map

Segment 2, Between SR-55 and SR-57


Segment Improvements
  • Add new eastbound general purpose lane

  • Reconstruct Kramer Boulevard and Tustin Avenue overcrossings to include standard lanes, shoulders and sidewalks in each direction

segment 2 map

Segment 3, SR-91/SR-57 Interchange


Segment Improvements
  • Improve westbound SR-91 to northbound and southbound SR-57 connectors Add an auxiliary lane from SR-57 to Raymond Avenue/East Street off-ramp

  • Reconstruct La Palma Avenue overcrossing to include standard lanes, shoulders and sidewalks in each direction

  • Add bypass ramp for northbound SR-57 Orangethorpe Avenue off-ramp prior to SR-91, eliminating the need to merge across multiple lanes at the interchange

segment 3 map

Contact the SR-91 Community Outreach Team

If you have questions or would like to request information in other language, please contact the Outreach Team at (888) 280-7966 or email 91project@octa.net.