605-Katella Improvement Project

The Orange County Transportation Authority (OCTA), in partnership with Caltrans, is set to begin construction this week (6/25/2025 )on the I-605/Katella Avenue Interchange Project, enhancing safety and making it easier to travel for everyone whether they’re driving, biking or walking. At least that is the stated intent.

Our Rossmoor will do our best to keep everyone apprised of closures, yet sometimes we aren’t notified in time to get the word out, so check the OCTA site before heading out that way to access the I-605, especially at night.

 

8/04/2025 Update

Construction continues on the I-605/Katella Avenue Interchange Project. Here’s what to expect this week:

Temporary closures of on and off ramps, especially at night (9 PM to 5 AM)

Nighttime work for the reconstruction of the center median that is east of the Coyote Creek Channel is expected to continue through the end of August. Crews will continue concrete work for the curb of the new median.

Crews will continue nighttime vegetation removal until mid-August. Work will focus on clearing vegetation near the northbound I-605 on-ramp. This will necessitate closing the outside lanes of northbound I-605, as well as the on-ramp, nightly from 9 p.m. to 5 a.m., starting Monday, August 4, through Friday, August 8 (extending into early Saturday morning).

 

6/30/2025 Update

Starting the week of June 30, crews are expected to perform daytime vegetation removal around various on- and off-ramps as well as install construction signs to prepare the interchange for upcoming construction activities. Work hours are Monday through Friday, from 6 a.m. to 4 p.m.

Anticipated to begin after the Fourth of July holiday, several overnight on- and off-ramp closures are expected over multiple nights in order for crews to safely:

• • Install temporary concrete barriers
  • Restripe Katella Avenue
  • Demolish and reconstruct the center median on Katella Avenue/Willow Street beneath the freeway

Night work will generally occur between 9 p.m. and 5 a.m. Message signs will be placed in advance of the closures. Specific details regarding ramp closures will be available in future communications.

6/23/2025 Update:

Initial work starts this week (Wednesday, June 25, 2025). 

Heavier construction and intermittent lane and ramp closures will start the week of July 7 to avoid traffic disruptions during the Independence Day holiday.