SR-91 (SR-57 to SR-55) Improvement Project
Construction Updates
Construction Anticipated to Start Mid-April 2025
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

Segment 1, SR-91/Lakeview Avenue Interchange
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Reconstruct Lakeview Avenue overcrossing to include standard lanes, shoulders and sidewalks in each direction
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Realign westbound State Route 91 (SR-91) on-ramp at Lakeview interchange
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Add new on-ramp from Lakeview connecting directly to SR-55
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Separate westbound SR-91 and southbound SR-55 traffic

Segment 2, Between SR-55 and SR-57
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Add new eastbound general purpose lane
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Reconstruct Kramer Boulevard and Tustin Avenue overcrossings to include standard lanes, shoulders and sidewalks in each direction

Segment 3, SR-91/SR-57 Interchange
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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
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Reconstruct La Palma Avenue overcrossing to include standard lanes, shoulders and sidewalks in each direction
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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

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.