There will be a full closure and one-lane traffic control Monday night into Tuesday
TOPANGA – Crews will fully close Topanga Canyon Boulevard/State Route 27 (SR-27) between Grand View Drive and State Route 1/Pacific Coast Highway (PCH) from 11:59 p.m. Monday to 5 a.m. Tuesday, July 6-7, to continue prep work to install a concrete pipe.
Additionally, one-lane traffic control with flaggers directing traffic will occur between 9 and 11:59 p.m. Monday at mile marker 2.5 on SR-27. The one-lane section will be less than a mile.
Crews are modifying the highway at this location to install an 84-inch reinforced concrete pipe underneath and perpendicular to SR-27. By reconfiguring the traffic lanes, crews can work on installation behind k-rail and minimize impacts to traffic.
The 84-inch reinforced concrete pipe is designed to carry increased capacity of water and mud during rainstorms, reducing the amount of debris flow on the highway in future storms. It is replacing a 34-inch pipe. Additional work on this project includes a drainage system and access road for future pipe maintenance. The entire project is expected to be completed around November 2026.
This work is part of Caltrans’ SR-27 recovery projects from the 2025 Palisades Fire and subsequent storms.
North of the work zone, overnight lane closures for SR-27 pavement rehabilitation will also be in effect. Check current traffic conditions on the Caltrans Quickmap.
Motorists are advised to remain focused on the road through this stretch of SR-27 to avoid additional delays. Take extra caution while driving, especially around blind curves, in case of stalled traffic. Fines can be doubled in work zones.