Caltrans TCB Closure Update 4-26-24

Caltrans TCB Road Closure 1

UPDATE 4/26: Topanga Canyon Landslide at Postmile 1.8 on SR-27

  • Our Geotechnical Services team is mapping the slide. A Geotechnical Report will take about 1.5 to 2 weeks to complete. Information from the mapping operations will be used to refine the quantities and calculations into the model for our geotechnical report.
  • Due to present geological conditions and instability of the slope, material must be removed from the top down. Removing the “toe” of the slope will bring down the unstable earth and large boulders above as water is still percolating under the surface.
  • Contractor Elo Engineering is using a heavy-duty loader to complete a 5-foot-tall berm and a silt fence is being installed behind the berm to protect Topanga Creek (see photos). The loader also needs to clear a path for grading equipment, which includes a Spider excavator and bulldozers.
  • While a geologist works on the report, Caltrans needs to obtain permits and identify a location to dump an estimated 90,000 cubic yards of dirt, mud and boulders. 
  • An SR-27 full closure remains in place from Grand View Drive to PCH (SR-1). Clearing the roadway is estimated to be complete in fall 2024.
  • NOTE: Caltrans strongly urges pedestrians and bicyclists to avoid the work zone because a loader is moving boulders, dirt and mud. Because of safety concerns, progress will be slowed or delayed if pedestrians or cyclists enter the work zone. 
  • Temporary Signals: Caltrans Traffic Operations will investigate the temporary signal at Tuna Canyon and PCH (SR-1) on Tuesday (4/30) starting at 6:30 a.m. to make timing revisions — if necessary — based on the traffic count observation. The contractor previously hard-wired the connections on this temporary signal after an early malfunction. We’ve since received complaints about long wait times on Tuna Canyon due to the signal timing. Recent observations showed up to 10 vehicles from Tuna Canyon have been able to get through on a green light. Traffic flow varies depending on time of day. PCH is a major commuter and freight corridor that links Ventura County to Malibu, Pacific Palisades, Santa Monica and Los Angeles.

Megan Jamerson KCRW radio: Landslide Closure Leaves Topanga Canyon in Distress, hear the audio story.

Learn how the Town Council has made appeals to the local schools regarding tardiness and worked with businesses to find possible funding opportunities.

To get updated emergency information, TCEP’s Emergency Status Page or @TCEP90290

Road questions can be sent to, Caltrans’ designated email communication system. For more links, visit’s Caltrans road closure update page.

See video of Caltrans loaders working on TCB.

Caltrans TCB Road Closure 2

Caltrans TCB Road Closure 3