Visit this page often for news and updates on the OCTA I-405 Improvement project, which will result in the creation of additional lanes from SR-73 to the I-605.

Currently, the San Diego Freeway (I-405) is one of the most congested freeways in Orange County, carrying more than 300,000 vehicle trips in some sections each day. By 2040, traffic volumes on the I-405 are expected to increase significantly. The I-405 Improvement Project will increase freeway capacity, improve traffic and interchange operations, and enhance road safety to meet state and federal standards.

OCTA in cooperation with The California Department of Transportation (Caltrans) is widening the San Diego Freeway (I-405) between State Route 73 (SR-73) and Interstate 605 (I-605). The widening includes the addition of one general purpose lane in each direction on I-405 from Euclid Street to the I-605 interchange, plus tolled express lanes in each direction of I-405 from SR-73 to SR-22 east. The tolled 405 Express Lanes and the existing HOV lanes would be managed jointly as a single tolled express facility with two lanes in each direction from SR-73 to I-605.

For information about the project and to sign up for email alerts, please visit OCTA's web page www.octa.net/405improvement or Facebook page www.facebook.com/405improvement.

Documents

• I-405 Improvement Project Presentation - July 21, 2015 City Council meeting
• I-405 Improvement Project Environmental Documents 
• San Diego Freeway Improvement Project Overview
• San Diego Freeway Improvement Project Committees 
• San Diego Freeway Improvement Project Resources
• San Diego Freeway Improvement Project History 

Project updates

• Oct. 14, 2019
• Oct. 7, 2019
• Sept. 30, 2019
• NB I-405 on-ramp from SB Beach Boulevard Closed for One Month
• Sept. 23, 2019
• Sept. 16, 2019
• Bushard Street Bridge Demolition
• Sept. 9, 2019
• Talbert Bridge Demolition
• Sept. 2, 2019
• Aug. 19, 2019
• Aug. 12, 2019
• Magnolia Street Falsework Construction
• August 5, 2019
• July 29, 2019
• July 22, 2019
• July 15, 2019
• July 8, 2019
• July 1, 2019
• Bolsa Avenue Bridge Closure
• Harbor Boulevard Partial Demolition
• June 24, 2019
• Magnolia Street Falsework Construction
• June 17, 2019
• June 10, 2019
• Bolsa Avenue Partial Demolition
• June 3, 2019
• Westminster Boulevard Partial Demolition
• May 27, 2019
• May 20, 2019
• May 13, 2019
• May 6, 2019
• April 29, 2019
• April 22, 2019
• April 15, 2019
• Bolsa Avenue Bridge Demolition
• April 8, 2019
• April 1, 2019
• Slater Avenue Falsework Construction
• March 25, 2019
• Bolsa Avenue Traffic Switch Rescheduled
• Bolsa Avenue Traffic Switch
• March 18, 2019
• Fairview Road Bridge Partial Demolition
• Westminster Boulevard Traffic Shift
• Fairview Road Bridge Partial Demolition
• March 11, 2019
• Fairview Road Bridge Partial Demolition
• March 4, 2019
• February 25, 2019
• February 18, 2018
• Fairview Road Traffic Shift
• February 11, 2019
  
• Fairview Road Traffic Shift
• February 4, 2019
  
• January 28, 2019
  
• January 21, 2019
  
• January 14, 2019
  
• January 7, 2019
  
• December 31, 2018
  
• Archived updates