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District 7 Projects

Topanga Canyon Blvd. (State Route 27) Emergency Fire Repairs

Burned slopes above the roadway. Steep slopes burned by the Topanga Canyon fire.

 

The Project

This Caltrans emergency project involved repairs and preventive measures on Topanga Canyon Boulevard (State Route 27) following a June 29, 2017, wildfire. The incident burned more than 50 acres in steep terrain and prompted the temporary closure of the highway north of Pacific Coast Highway (State Route 1) in Los Angeles County.

Background

Earlier, the same area of State Route 27 was damaged by severe winter storms in January 2017. The storm damage forced the closure of the highway for more than a week due to rock slides and other debris, unstable slopes alongside the roadway and other damage. Working quickly, Caltrans stabilized the slopes, removed large boulders and other material, repaired the roadway, cleaned and fixed the drainage system, replaced guard rails and completed other repairs.  After the June wildfire, Caltrans examined the area and determined that additional steps were needed to repair fire damage to the slopes and restrict large debris during future rain events. This work is intended to prevent future closures or disruption of State Route 27 and maintain full access for residents, emergency services and commercial traffic.

Benefits

In response to the June 2017 wildfire in Topanga Canyon, Caltrans took the following measures to limit the potential threat of more slides during the next rainy season, which could result in additional closures:

  • Placing temporary concrete barriers (“k-rail”) equipped with temporary rock-fall fence to prevent any material from falling into the travel lanes of State Route 27.
  • Building a debris-flow fence to restrict large slope material from coming down in future storms.
  • Installing rock-fall protection cable mesh near post mile 1.0 at the burn site.
  • Clearing rocks and other debris from behind K-Rail and shoulders next to SR-27
  • Anchoring large boulders on Topanga Canyon to reduce the risk of them breaking off and coming down the slops.

 

Before After  
 
SR-27/Topanga Canyon Blvd. on July 3, 2017 Area off SR-27/Topanga Canyon Blvd. on Oct. 2, 2017 with new rock fall fence.  
Before After After
Area along SR-27/ Topanga Canyon Blvd. July 7, 2017. Area along SR-27/Topanga Canyon Blvd. Oct. 2, 2017 with newly installed rock fall fence. Oct. 2, 2017: New rock fall fence installed above gully on SR-27/Topanga Canyon Blvd.
Before After After
Boulders in Topanga Canyon off SR-27 on Aug. 23, 2017 Oct. 2, 2017: Rock fall protection cable installed on boulder at base of Topanga Canyon off SR-27 Oct. 2, 2017: Rock fall protection cable installed on boulder at base of Topanga Canyon off SR-27
     
Crews cleared base of slope next to State Route 27 in Topanga Canyon Sept. 23 and 24 ahead of installation of rock fall fence. The repairs and added fencing on temporary K-rail is intended to prevent rocks and other debris from falling on lanes of SR-27. On Sept. 23 and 24, crews cleared rocks and other debris from gully behind K-rail in area of Topanga Canyon (facing northbound State Route 27) that burned in summer wildfire.

Slope along State Route 27 in Topanga that burned in June 2017 wildfire is starting to grow new vegetation. Crews made repairs to burn areas over two weekends in Sept. and Oct. to limit the threat of potential slides during the next rainy season.

 

Schedule

One full weekend and one partial weekend closure (3 days total) was needed to complete the work.
The schedule, subject to change, was as follows:

1st Weekend Full Roadway Closure (Daytime) to begin fire damage repair operations:
FULL ROADWAY CLOSURE ON SATURDAY, SEPT. 23, 2017 from 6:00 a.m. to 6:00 p.m., and
FULL ROADWAY CLOSURE ON SUNDAY, SEPT. 24, 2017 from 6:00 a.m. to 6:00 p.m.

2nd Weekend Full Roadway Closure (Night Time) to continue and complete operations:
FULL ROADWAY CLOSURE ON SATURDAY, SEPT. 30, 2017 from 9:00 p.m. to 5:00 a.m., and
FULL ROADWAY CLOSURE ON SUNDAY, OCT. 1, 2017 from 9:00 p.m. to 5:00 a.m.

The Topanga Town Area Will Remain Open.

Bike and pedestrian access is prohibited during the closure.




The repairs were done on a 4-mile section of Topanga Canyon Blvd. (State Route 27) from Pacific Coast Highway to approximately Grand View Drive

28 Sep 2017 - Update - Section of Topanga Canyon Boulevard to close for burn area repairs

Where can I get more information?

Caltrans Public Affairs Office: (213) 897-3656
Tim Weisberg, Public Information Officer: (213) 897-3630
Timothy.Weisberg@dot.ca.gov
www.dot.ca.gov/d7/projects
On Twitter: @CaltransDist7







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