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405 Delays Sepulveda Pass Ventura Boulevard and Mulholland Drive 8/21-8/24
TRAFFIC ALERT: Major 405 Freeway Delays Expected Through Sepulveda Pass Aug. 21–24 Caltrans is warning Los Angeles motorists to prepare for significant delays on southbound I-405 through the Sepulveda Pass, but one important clarification: the major lane reduction is not continuous from now through August 24. The next extended closure is scheduled for Friday night, August 21 through early Monday, August 24, 2026.
I-405 Sepulveda Pass lane reductions
From 10 p.m. Friday, August 21 until 5 a.m. Monday, August 24, Caltrans plans to reduce southbound I-405 to three lanes between Ventura Boulevard and Mulholland Drive. Northbound I-405 is not scheduled for the same extended lane reduction during this weekend operation.
Drivers should also know about these closures during the work:
- Ventura Boulevard on-ramp to southbound I-405 — CLOSED
- Northbound I-405 off-ramp to Getty Center Drive — CLOSED
- Southbound I-405 — reduced to three lanes between Ventura Boulevard and Mulholland Drive
- Work begins 10 p.m. Friday, August 21
- Restrictions are scheduled to end 5 a.m. Monday, August 24.
Why Caltrans is doing the work
The construction is part of the I-405 Sepulveda Pass Pavement Rehabilitation Project, a roughly $143.7 million improvement project covering about 10.2 miles between Van Nuys and Westwood. Caltrans says the project will replace or rehabilitate pavement, improve safety and mobility, extend pavement life, and restore nearly 92 lane-miles. New overhead and roadside signs are also part of the project.
Caltrans says these extended weekend reductions will occur periodically as the larger project continues, and schedules can change because of weather or construction conditions.
What LA drivers should expect
This section of the 405 is already one of the most heavily traveled routes connecting the San Fernando Valley with West Los Angeles, so reducing southbound traffic to three lanes could create substantial backups, particularly around the 101/405 interchange, Ventura Boulevard, Mulholland/Skirball Center Drive and the climb through the Sepulveda Pass.
Caltrans is specifically encouraging motorists to use alternate routes or public transportation when possible.
