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# Overnight closure of Topanga Canyon Boulevard set for Aug. 28-29 as Palisades Fire recovery nears end
- URL: https://www.smdp.com/overnight-closure-of-topanga-canyon-boulevard-set-for-aug-28-29-as-palisades-fire-recovery-nears-end/
- Published: 2026-08-22T16:00:00.000Z
- Updated: 2026-08-22T15:59:59.000Z
- Author: Maaz Alin
- Tags: Transportation, Los Angeles

Topanga Canyon Boulevard will shut down entirely overnight later this month so crews can continue installing a large storm drain beneath the highway, part of the final major phase of recovery from the Palisades Fire and winter storms, Caltrans said.

State Route 27 will be fully closed between [Pacific Coast Highway](https://www.smdp.com/malibu-declares-local-emergency-to-speed-encampment-removals-as-fire-conditions-worsen/) and Grand View Drive from 11:59 p.m. Friday, Aug. 28, to 8 a.m. Saturday, Aug. 29\. Before the full closure, from 9 to 11:59 p.m. Friday, the highway will be reduced to a single lane shared by both directions for about a half-mile near mile marker 2.5, with flaggers directing alternating traffic while crews reconfigure the work zone.

The reconfiguration allows crews to keep installing the drainage culvert perpendicular to the roadway with minimal impact on traffic, Caltrans said. North of the closure, SR-27 will remain open between Grand View Drive and U.S. 101.

Caltrans advised southbound SR-27 drivers to detour via U.S. 101 to southbound Interstate 405, then westbound Interstate 10 to northbound PCH. Northbound drivers were directed to take southbound State Route 1 to eastbound I-10, then northbound I-405 to westbound U.S. 101.

The 84-inch reinforced concrete pipe being installed is designed to carry stormwater and increased mud and debris flow during rainstorms, reducing the risk of debris spilling onto the highway and triggering an embankment failure in future storms. The pipe installation is expected to cost about $2.75 million.

Caltrans described the work as the last major piece of ongoing recovery on SR-27 from the Palisades Fire and winter storms. The pipe installation is expected to be finished by fall 2026, with most recovery work on the highway wrapping up by the end of the year.

The weekend shutdown is one of several Caltrans projects underway along the coastal corridor still recovering from the fire. Along Pacific Coast Highway from Temescal Canyon Road in Pacific Palisades to Carbon Beach Terrace in Malibu, crews may set up single-lane closures anytime from 9 a.m. to 3 p.m. on weekdays through Aug. 30 for creek cleanup and roadway, drainage, slope and retaining-wall repairs. Overnight, both northbound lanes of PCH between Sunset Boulevard and Porto Marina Way will close from 9 p.m. to 6 a.m. Monday nights through Friday mornings, with both directions of traffic sharing the southbound lanes.

Caltrans urged motorists to stay alert and focused while driving through the SR-27 work zone, where the speed limit drops to 15 mph, and to take extra caution around blind curves in case of slowed traffic. Fines can be doubled in a work zone.

Farther inland, [Caltrans](https://dot.ca.gov/?ref=smdp.com) is pressing ahead with a separate pavement rehabilitation project on Interstate 405 through the Sepulveda Pass. Overnight lane reductions, ramp closures and connector closures ran from 9 p.m. to 6 a.m. Monday through Friday, Aug. 24 to Aug. 28, with up to five lanes of northbound I-405 closed at some points and the speed limit reduced to 55 mph in certain sections for paving work.

A larger weekend closure follows next month. Southbound I-405 will be reduced to three lanes between Ventura Boulevard and Mulholland Drive from 10 p.m. Friday, Sept. 11, to 5 a.m. Monday, Sept. 14\. Northbound I-405 will not be affected by the reductions. Caltrans strongly encouraged motorists to seek alternate routes and consider public transportation during that weekend.

The freeway work is part of the I-405 Pavement Rehabilitation Project between the Los Angeles communities of Van Nuys and Westwood, which will apply about $143.7 million toward improving safety and mobility along the corridor and extending the life of the pavement.

All of the closures are weather-permitting and subject to change, including their times, dates and scope, Caltrans said. Residents and businesses near the freeway work may experience noise, vibrations and dust. The agency reminded drivers to "Be Work Zone Alert" and to "Slow for the Cone Zone," and directed motorists to its Quickmap website for current road conditions.