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.
