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Weekend Closures

55-Hour Closure

In preparation for a new interchange configuration, crews will perform construction activities that will require continuous 55-hour closures starting as early as 9 p.m., Friday, Feb. 27 to 4 a.m., Monday, March 2.

Closures:

• Westbound (WB) SR-91 straight on-ramp at Lakeview Avenue
• One lane of southbound (SB) Lakeview
• One lane of northbound (NB) Lakeview

Additional Sunday Night Closures

Along with the 55-hour ramp closure, crews are expected to close the following from as early as 6 p.m., Sunday, March 1 to 4 a.m., Monday, March 2:



• Both directions of Lakeview Avenue between Riverdale Avenue and Santa Ana Canyon Road
• WB SR-91 off-ramp at Lakeview
• Eastbound (EB) SR-91 on-ramp at Lakeview
• WB SR-91 straight on-ramp at Lakeview
• WB SR-91 loop on-ramp at Lakeview

There will also be reduced lanes on the WB SR-91 freeway from 8 p.m., Sunday, March 1 to 4 a.m., Monday, March 2.

Please refer to the detours in the map above during the full street closure.

This work may cause traffic delays. This work may be loud due to construction equipment, back up alarms, and concrete removal. The schedule is subject to change due to inclement weather or unforeseen operational issues.

During the closures above, crews will reconfigure the Lakeview Avenue interchange to prepare for the next stage of construction on Segment 1 of the SR-91 Improvement Project. Motorists will notice a new traffic pattern to access WB SR-91 while crews continue to reconstruct the Lakeview Avenue bridge to accommodate the new ramp connecting directly to SB SR-55.

Starting at 4 a.m., Monday, March 2 motorists traveling both NB and SB on Lakeview Avenue will use a new signalized intersection to access the newly realigned WB SR-91 straight on-ramp, and the WB SR-91 loop on-ramp at Lakeview Avenue will be permanently closed.

Additionally, the eastern side of Lakeview Avenue will be fully closed to pedestrians through August 2026. The western side will be accessible to pedestrians.

New Traffic Pattern:

• NB motorists will turn left at the signal to access the on-ramp
• SB motorists will turn right at the signal

Upcoming Nightly Directional Freeway Closures for Girder Installation

Crews are anticipated to perform two weekends of nightly directional freeway closures to install girders for the new bridge:

11 p.m. to 7 a.m. Friday, March 6 and Saturday March 7 (into Sunday morning)

• EB SR-91 between SR-55 and Lakeview Avenue
• EB/WB 91 Express Lanes between SR-55 and County Line

11 p.m. to 7 a.m., Friday, March 13 and Saturday, March 14 (into Sunday morning)

• WB SR-91 between Tustin Avenue and Lakeview Avenue
• EB/WB 91 Express Lanes between SR-55 and County Line

Additional information regarding these closures will be provided in the following construction alert. 


Falsework Construction for New Bridge

Crews are setting up falsework, or temporary support structures, to prepare for the next phase of construction. In addition, crews are preparing for girder, steel support beams, installation which will occur during the first two consecutive weekends in March.

Crews preparing to place temporary structures to build the next step of the new Lakeview Avenue bridge.

Completed concrete pour for a portion of the new Lakeview Avenue bridge.

Crews placing temporary support structures for construction of the new Lakeview Avenue bridge.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Sound and Retaining Wall Construction

Crews continue work on a sound wall along the WB SR-91 on-ramp and a retaining wall along the EB SR-91 on-ramp. Daily construction activities will start as early as 7 a.m. to 4 p.m. The new walls are anticipated to be complete by mid-2026.

Crews placing and grouting the blocks that form the top of the sound wall along the WB SR-91 on-ramp and placing structural backfill for the retaining wall along the EB SR-91 on-ramp.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Construction on Segment 2 of the SR-91 Improvement Project is expected to begin in mid-2026.

Construction on Segment 3 of the SR-91 Improvement Project is expected to begin in February 2026, bringing major upgrades to the SR-91/SR-57 interchange and surrounding areas to improve traffic flow, enhance safety, and support long-term mobility.

During the week of February 22, crews are scheduled to begin putting up construction signs within the corridor. K-rail placement and clearing and grubbing activities will follow. Additional schedule updates will be shared in upcoming alerts.

Learn more about planned improvements at octa.net/91Improvements.

Street Closures:

• NB Lakeview Avenue between Santa Ana Canyon and WB SR-91 Off-Ramp:
• Nightly, as early as 10 p.m. to 5 a.m., Monday, Feb. 23 through Friday, Feb. 27 (into Saturday morning)

Freeway and Ramp Closures:

Nighttime lane closures on EB and WB SR-91 will occur regularly throughout construction. At least one lane will be open to traffic at all times, unless otherwise specified.

• WB SR-91 Straight On-Ramp at Lakeview Avenue
• Nightly, as early as 10 p.m. to 5 a.m., Thursday, Feb. 26 and Friday, Feb. 27
• WB SR-91 Loop On-Ramp at Lakeview Avenue
• Nightly, as early as 10 p.m. to 5 a.m., Monday, Feb. 23 through Friday, Feb. 27 (into Saturday morning)
• EB SR-91 On-Ramp at Lakeview Avenue
• Nightly, as early as 10 p.m. to 5 a.m., Monday, Feb. 23 through Friday, Feb. 27 (into Saturday morning)
• EB SR-91 Loop On-Ramp at Lakeview (Two-Year Closure):
• The two-year closure started on July 7, 2025

The schedule is subject to change due to inclement weather or unforeseen operational issues.

For a full list of weekly closures and detours, and the most up-to-date project information, please click on the project Google Map below.

Bookmark the closures and detours map above for quick access to real-time construction information. Click on the construction icons to view activities and closure and detour information. Plan for additional travel time through the area. Detour signs will be in place to assist motorists.

The SR-91 (SR-57 to SR-55) Improvement Project will improve 6.6 miles of State Route 91 (SR-91) through Anaheim, Fullerton, Orange, Placentia and Yorba Linda. The project will improve mobility throughout the corridor, reduce weaving and merging between ramps, and improve on- and off-ramps. The project will reconstruct the La Palma Avenue, Kraemer Boulevard/Glassell Street, Tustin Avenue and Lakeview Avenue bridges and interchanges with standard lanes, shoulders and sidewalks in each direction. Visit our website for more information on segment and schedule details, octa.net/91improvements.

View common questions about the project.

If your community or organization is interested in receiving a project presentation or briefing, please email the Outreach Team at 91Project@octa.net.