Repairs continue in the wake of landslides that devastated neighborhoods and heavily damaged roads maintained by the California Department of Transportation (Caltrans) after the wildfires around Los Angeles in early 2025.

One of the ongoing initiatives to repair the damage is the Topanga Canyon Boulevard/State Route 27 Palisades Fire Emergency Repairs project.

The $59.5 million initiative, whose costs are expected to increase, is financed by state emergency funds. Estimates target completion in 2026, depending upon the weather and other conditions.

Caltrans awarded the emergency work contract to Flo Engineering.

Caltrans photo

"Working with Cal Fire, West Region Maintenance crews have cleared brush from Topanga Canyon and delivered 27 loads of dirt to California State Parks for erosion control," according to Caltrans' Topanga Canyon Boulevard emergency project website. "Debris removal from the February slides was completed, with all 33,000 cubic yards of mud and debris cleared.

"To date, all dirt has tested clean. This material has been hauled out to farms in Somis and is also being used to replenish state park land impacted by the fire and storms. The storm that came in on April 26 brought down more debris, but that has been cleared."

Caltrans has worked with various state, regional and local agencies on recovery work, including the California Highway Patrol, the Federal Emergency Management Agency (FEMA), U.S. Army Corps of Engineers, Los Angeles County Public Works and Southern California Edison to rejuvenate Topanga and Pacific Coast Highway.

The goals are to restore Topanga Canyon Boulevard by building retaining walls in three locations (post-miles 2.363, 2.52 and 2.712) and rebuilding the shoulders and lanes where the road was washed away. Caltrans is installing debris flow barriers and larger culverts and clearing debris from nine locations where slides occurred.

The project also is installing K-rail, replacing damaged guardrails, rebuilding damaged shoulders and lanes, clearing drainage lines, restoring slopes and applying erosion control at affected slopes to restore the highway and to prevent any long-term damage to the highway.

"These improvements will help minimize the impacts of future debris/mudflows on SR 27 due to the extensive burn scars in the canyon," said Katy Macek, a Caltrans District 7 public information officer. "Southern California Edison continues work undergrounding utility lines. The Los Angeles County Department of Public Works is rerouting a water main connection that was exposed when the road washed away."

"The Palisades Fire did severe damage to a lot of state-owned property, including destroying the Las Flores Maintenance Station," Macek said. "The fire and subsequent storms that brought mud and debris flows left significant damage on State Route 27, including burned and washed-out roadway signs and guardrail and exposing a water main pipe owned by Los Angeles County Public Works. It also made slopes more vulnerable to future storms.

"Caltrans' initial response was all hands on deck," she added. "We had crews working at all hours on the highways to clean up debris. Crews [arrived] from nearby District 12 (Orange County) and District 8 (San Bernardino/Riverside). We also operated a 24/7 Emergency Operations Center staffed by people from nearly every Caltrans division that continued after the fires through the February and March rainstorms."

Topanga Canyon Boulevard reopened for public use for a 3.6-mi.-stretch between Pacific Coast Highway and Grand View Drive on May 23. The roadway remains closed overnight between Pacific Coast Highway and Grand View Drive for continuing repair work.

Caltrans photo

The work is having an impact on traffic. Caltrans points out that a 25-mph speed limit between Grand View Drive and PCH is in effect, continuing into the closure limits on PCH between Chautauqua Boulevard in Los Angeles and Carbon Beach Terrace in Malibu; that one-way directional flagging (or one-way traffic control signals) at various points due to ongoing work between post mile 2.3 and 2.7.

Meantime, crews have removed more than 35,000 cu. tons of mud and debris, replaced damaged roadway signs and installed debris flow barriers at multiple locations on SR 27.

"We've also reinforced soil slope with geogrid at multiple locations and installed temporary K-rail to supplement areas with burned guardrail," Macek said. "Crews are currently working on culvert repair and building a retaining wall in the one-way traffic control operation."

To remove the debris, crews used Cat 950GC loaders.

"The loaders would pile up debris and, at night, 20-plus Super 10s would haul out debris to the dumpsite," Macek said.

Debris flow barriers were installed by carefully removing the previous debris flow barriers and anchors.

"New anchors were then drilled and grouted," Macek said. "New debris barriers were fabricated per each existing or new flowline area. Drilling type involved rotary drill pipe, where the contractor would keep feeding the drilling equipment with 5-foot length drilling pipe until the desired depth was met."

Approximately five debris flow barriers were placed, with approximately nine culverts repaired. And approximately 46 damaged signs were replaced.

Caltrans photo

Approximately 500 ft. of temporary K-rail was placed with forklifts to expedite the work.

Among other equipment, Flo Engineering is using Cat 325 and 315 excavators, Cat 950 GC loaders, a Kubota SSV75 skid steer/loader, CAT D4 dozers, Super 10s and a 2,000-gal. water truck.

Typical days have 12 Flo Engineering personnel on site.

The project has multiple other challenges.

"The biggest construction challenge is balancing the needs of the safety of our workers along with the safety of the traveling public," Macek said. "In addition, SR 27's unique design winding between the canyon leaves little available space to deploy equipment and manpower. Keeping the highway closed would have made the recovery time quicker."

Safety is a primary concern for all workers on site.

"Caltrans crews are committed to following best safety practices, including daily meetings, wearing personal protective equipment and enhancing motorist safety by deploying the pilot car through the one-lane traffic in addition to flaggers," Macek said. "Crew fatigue is also real, so Caltrans supervisors work to balance the production rate with crew safety."

A project of this scope and scale can take its toll on the equipment. Mechanics can be called in to handle daily wear and tear issues and routine maintenance. Damaged tires, blades, teeth and hoses are being repaired and replaced.

Flo has on-site mechanics to ensure that repairs are quickly completed. CEG