OCTA, in cooperation with Caltrans, is improving the local interchange at Interstate 605 and Katella Avenue to improve mobility, smooth traffic flow, and enhance pedestrian and bicycle facilities.

Construction Activities

Construction is underway and generally occurs Monday through Friday, from 6 a.m. to 4 p.m.

Beginning the week of July 7, nighttime activities are slated to begin, which will require lane reductions on both directions of Katella Avenue and closures of various on- and off- ramps for crews to safely perform the work. These nighttime activities are generally from 9 p.m. to 5 a.m. and include:

• Installing temporary concrete barriers to create a safe work zone
• Restriping Katella Avenue, shifting traffic to the outside lanes
• Sawcutting concrete
• Demolishing and reconstructing the center median on Katella Avenue/Willow Street beneath the freeway

Upcoming On- and Off- Ramp Closures

The following ramps are expected to be intermittingly closed starting the week of July 7 from 9 p.m. to 5 a.m. nightly. Certain ramps may reopen earlier as crews complete work in certain areas.

Closure: Northbound I-605 Off-Ramp to Eastbound Katella Avenue

Closure: Northbound I-605 Loop Off-Ramp to Westbound Katella Avenue

Closure: Southbound I-605 Loop Off-Ramp to Eastbound Katella Avenue

Closure: Southbound I-605 Loop On-Ramp from Eastbound Katella Avenue

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

Rendering of Improvements along Katella Avenue

The rendering above highlights planned improvements along Katella Avenue between Coyote Creek Channel and Epson Way. Key features include:

• Reconfiguration of the northbound on- and off-ramps into a T-intersection
• Addition of Class II bike lanes with hatched markings to indicate bike lane transitions
• Installation of a new traffic signal at the northbound I-605/Katella Avenue off-ramp, along with upgraded signals at nearby intersections
• Painted crosswalks and newly constructed sidewalks to enhance pedestrian access and safety

Community Outreach

As part of its comprehensive public awareness campaign, the Public Outreach team is offering opportunities for the community to learn more about the project, its benefits, construction activities, and potential impacts. These include:

• Public webinars
• Neighborhood meetings
• Project briefings and presentations
• Project booths at community events

The Outreach team will be participating in the City of Los Alamitos’ Concerts in the Park on  Thursday, July 17 from 6:30-8 p.m. at Little Cottonwood Park (4000 Farquhar Avenue). We encourage you to stop by to learn more and ask questions.

Construction Closures & Detours