I-5 South County Improvements Project
Construction Updates
OCTA, in cooperation with Caltrans, is widening I-5 between SR-73 and El Toro Road. The project will improve 6.5 miles of I-5 through Mission Viejo, Laguna Niguel, Laguna Hills, and Lake Forest.
View Closures & Detours 
Project Details
Today, nearly 360,000 motorists travel I-5 daily between the San Joaquin Hills Toll Road (SR-73) and El Toro Road. Transportation planners expect traffic volumes to grow 25 percent by 2045. To address this travel demand, OCTA and Caltrans are working together to implement the San Diego Freeway (I-5) Widening project from SR-73 to El Toro Road.
roadway- New northbound and southbound general purpose lane from Avery Parkway to Alicia Parkway.
- Extension of the second carpool lane from Alicia Parkway to El Toro Road, in both directions
structure- Reconstruct Avery Parkway and La Paz Road interchanges, and improve Los Alisos Boulevard Bridge
- Modify all on- and off-ramps in project area
- Add new sound and retaining walls
operational- Restripe carpool lanes for continuous access, making it easier for motorists to enter and exit the lanes at any time
- Add new and reestablish existing auxiliary lanes between interchanges to improve merging
- Install new overhead signs and lighting
- Restripe regular lanes within project limits
details6.5 miles
Mission Viejo, Laguna Niguel, Laguna Hills, Lake Forest
$580 million
Mid-2019 to Early 2025
Segment Overview
This freeway improvement project is being built in three segments and includes several roadway, structural and operational improvements such as new general purpose lanes, improved interchanges as well as on- and off-ramps
SR-73 to Oso Parkway
Oso Parkway to Alicia Parkway
Alicia Parkway to El Toro Road
Avery Parkway
- Improve all Avery Parkway on- and off-ramps
- Add northbound and southbound general purpose lane
- Reconstruct Avery Parkway Interchange
- Add retaining walls
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
Crown Valley Parkway
- Modify five on- and off-ramps at Crown Valley
- Add northbound and southbound general purpose lane
- Add Major Retaining Walls
- Add Minor Retaining Walls
- Add Concrete Barriers
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
Oso Parkway
- Add northbound and southbound general purpose lane
- Modify six on- and off-ramps at Oso Parkway
- Add sound and retaining walls
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
La Paz Road
- Add northbound and southbound general purpose lane
- Reconstruct La Paz Road Interchange
- Add sound and retaining walls
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
Alicia Parkway
- Extend second carpool lane from Alicia Parkway to El Toro Road
- Add retaining walls
- Modify on- and off-ramps at Alicia Parkway
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
El Toro Road
- Extend second carpool lane between Alica Parkway and El Toro Road
- Reconstruct Los Alisos Boulevard bridge
- Add retaining walls
- Convert carpool lanes to continuous access
- Add auxiliary lanes and reestablish existing ones
Social Media Feed
Latest Activity
I-5 South County Alert - July 18, 2022
I-5 South County Alert - July 11, 2022
I-5 South County Alert - July 5, 2022
I-5 South County Alert - June 20, 2022
I-5 South County Alert - June 13, 2022
I-5 South County Alert - June 6, 2022
I-5 South Weekly Alert - May 31, 2022
I-5 South Weekly Alert - May 23, 2022
I-5 South Weekly Alert - May 16, 2022
I-5 South Weekly Alert - May 9, 2022
I-5 South Weekly Alert - April 25, 2022
Contact the I-5 South County Improvements Project Outreach Team
If you have questions, please contact the Outreach Team by calling 949-614-0202 or email i5SouthCounty@octa.net
Para obtener más información sobre el proyecto, llame al 949-614-0202 o envíe un correo electrónico a i5SouthCounty@octa.net