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.
Segment 1: Lakeview to SR-55
⚠️ Nighttime Westbound Full Directional Freeway Closure ⚠️
What:
TONIGHT, crews will close the westbound (WB) SR-91 – including the WB and
eastbound (EB) 91 Express Lanes – from Imperial Highway to SR-55/Tustin Avenue.
When:
As early as 9 p.m., TONIGHT, Sept. 26 to 5 a.m., Saturday, Sept. 27
Why:
The full WB closure is necessary to restripe lanes and place temporary concrete barriers. The number of lanes will remain the same, however the configuration will shift slightly to allow crews to create protected work zones to facilitate the next stage of construction.
Closures:
WB SR-91 from Imperial Highway to SR-55/Tustin Avenue
WB SR-91 on-ramps from Imperial Highway
WB SR-91 on- and off-ramps at Lakeview Avenue
WB SR-91 connector to southbound (SB) SR-55
WB 91 Express Lanes between SR-55/Tustin Avenue and the Orange County/Riverside County line
Detours:
From Imperial Highway, turn left onto E. La Palma Avenue. Turn left on Tustin Avenue to access WB SR-91
To access SB SR-55, use the detour above. Turn right on the EB SR-91 loop on-ramp and continue to SB SR-55 connector
Lakeview Avenue Bridge
Pile Driving at Lakeview Avenue
Crews completed the first two portions of pile driving in the center median of the freeway and along WB SR-91. Work in the final location, along the EB SR-91 off-ramp, is expected to begin during on Sept. 29 and continue on weekdays through Friday, Oct. 13. Crews may be on the worksite as early as 6 a.m. and are anticipated to perform pile driving activities from 7 a.m. to 4 p.m.
While pile driving is a critical step in the construction process, it may also be noisy and cause some vibration.
This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.
Project Wall Activities
Along WB 91 On-Ramp
Crews are expected to continue daily work on the wall as early as 7 a.m. to 4 p.m. The new sound wall is anticipated to be complete by mid-2026.
Crews demolishing the old sound wall to accommodate the new SB SR-55 direct on-ramp that will be built.
Crews pouring concrete to construct the stems, the main structural support of the new sound wall.
Crews pouring concrete to form stem walls to support the new sound wall further along the WB 91 on-ramp at Lakeview.
Along EB 91 Off-Ramp
Crews are expected to continue demolishing the wall along the EB 91 off-ramp as early as 7 a.m. to 4 p.m., through Friday, Oct. 10.
Crews demolishing the existing wall along the EB SR-91 off-ramp.
Crews demolishing the existing wall along the EB SR-91 off-ramp.
Crews demolishing the existing wall along the EB SR-91 off-ramp.
This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.
Additional Closure Information
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.
EB 91 Loop On-Ramp at Lakeview (Two-Year Closure):
The two-year closure started on July 7, 2025.
91 Express Lanes:
The following nighttime closures of the 91 Express Lanes will occur between SR-55/Tustin Avenue and the Orange County/Riverside County line.
WB and EB 91 Express Lanes:
As early as 9 p.m. Friday, Sept. 26 to 5 a.m. Saturday, Sept. 27
Click the image above to view the Lakeview Avenue rendering on the project website.
About the Project
91 Connect Business Program
The "91 Connect: Shop Local, Support Local" program supports businesses along the SR-91 Improvement Project corridor by promoting visibility and minimizing construction impacts through proactive outreach. Business spotlights on the project website, social media, and construction alerts, are all aimed to encourage the community to shop local and raise awareness of local businesses during construction. Click here to learn more.
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, 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.
