405 Freeway Construction

The Orange County Transportation Authority, in cooperation with Caltrans, is widening the San Diego Freeway (I-405) between SR-73 and I-605.The project is improving 16 miles of I-405 between the SR-73 freeway in Costa Mesa and I-605 near the Los Angeles County line.

Construction updates are as follows:

• Northbound I-405 Loop Off-Ramp to Bolsa Avenue to Close Crews will close the NB I-405 off-ramp to Bolsa to support the reconstruction of the Bolsa bridge over I-405.

The 24-hour closure is set for 10 p.m. Friday, Aug. 21, to 10 p.m. Saturday, Aug. 22.

• Southbound (SB) Full Freeway Closures for Bolsa Avenue Bridge Falsework Removal

Crews will begin constructing the falsework for the Bolsa bridge over I-405.

This work requires full southbound freeway closures between Goldenwest Street and Bolsa.

The closures are set for 11 p.m.-5 a.m. through Friday, Aug. 21.

• Southbound I-405 Loop Off-Ramp to Westminster Boulevard is closed for one year

The southbound I-405 loop off-ramp is being reconstructed as part of the freeway widening.

The ramp will be closed for about a year.

A temporary traffic signal has been installed for the southbound I-405 off-ramp to Springdale Street by Aug. 11.

• I-405 Southbound Loop Off-ramp to Beach Boulevard is Closed

The southbound I-405 loop off-ramp to northbound Beach Boulevard was scheduled to be permanently closed by Aug. 18. Motorists will use the Beach Boulevard/Center Avenue off-ramp from now on to access northbound and southbound Beach Boulevard.