Thu. Sep 28th, 2023

I-405 Set to Close Overnight Saturday in Westminster

A full freeway closure is planned in both direction from 11 p.m. to 8 a.m. on Dec. 1 near Bolsa Chica Road/Valley View Street

ORANGE – I-405 through Westminster is scheduled to fully close from approximately 11 p.m. on Saturday, Dec. 1, to 8 a.m. on Sunday, Dec. 2, as part of the I-405 Improvement Project.
The full freeway closure, along with an overnight closure of the Bolsa Chica Road bridge, is necessary to demolish half of the bridge over I-405. The bridge will be demolished and reconstructed in two stages, allowing it to remain open to traffic during construction.

During this weekend’s freeway closure, southbound drivers will be detoured off the freeway at Bolsa Chica Road and back on at Westminster Boulevard. Northbound drivers will be detoured off the freeway at Valley View Street and will be routed to SR-22 where they can get back onto I-405.

Drivers should expect delays in the area and are encouraged to use alternate routes if possible. Up-to-date closure and construction information is available on the project’s interactive map at

The $1.9 billion I-405 Improvement Project will add one regular lane in each direction between Euclid Street and I-605, and a second lane in each direction in the center of the freeway from SR-73 to I-605 that will combine with the existing carpool lanes to form the 405 Express Lanes.

The bridge is the third of more than 18 bridges to be built, widened or replaced as part of the project, which will speed up travel times on I-405 between Costa Mesa and the Los Angeles County line, an area traveled by more than 370,000 vehicles a day.

The Bolsa Chica Road bridge is expected to take approximately 18 months to reconstruct. Improvements to the bridge include doubling the total number of lanes from four to eight and adding bike lanes in each direction.

This 16-mile segment of I-405 is one of the most heavily traveled stretches of highway in the nation, and both the regular lanes and carpool lanes are heavily congested during rush hour and on weekends. The project is critical to accommodate expected employment, population and housing growth throughout the region.

It currently takes drivers about an hour to travel this section of freeway during rush hour and without the project, the commute is projected to double in the next 20 years. Once the project is finished in 2023, it is expected to take about 30 minutes to drive the 16 miles during rush hour in the regular lanes and about 15 minutes in the 405 Express Lanes.

People are encouraged to visit the project website at to sign up for construction alerts via automated call, text message or email.

By Editor

The New Santa Ana blog has been covering news, events and politics in Santa Ana since 2009.

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