State Route 1 (SR-1) Permanent Slope Restoration
Location and Limits
In Los Angeles County, in Malibu, south of Big Rock Drive
The permanent slope restoration will replace the existing protection, a shotcrete wall, placed by an Emergency Contract in 2016 with a secant pile wall. The new wall design will utilize one row of Cast-In-Drilled-Holes (CIDH) piles, reducing the size of the holes, and the size of the W-section beams. Reduction of W-section size will allow smaller equipment to build the wall, reducing construction footprint.
This project will permanently repair the eroded slopes on SR-1 (Pacific Coast Highway/PCH). Storm damage during the winter of 2015-2016 has caused the slide damage along the ocean facing slope on at the location of this project. The work must be completed as rapidly as possible to prevent erosion, flooding, and enlargement of the sinkholes that will trigger long-term closures of this essential route and to maintain full access for residents, commuters, emergency services and commercial traffic. The 180-foot beach area is prone to erosion and needs proper slope protection.
What to Expect?
To provide space for construction along the 180-foot stretch of shoulder and roadway, traffic lanes will be shifted toward the hill, with the 10-foot-wide median reduced to 2 feet. There will be three 10-foot-wide lanes and one 11-foot-wide lane during construction, with no shoulder in both directions. The speed limit in the work zone will be reduced to 25 MPH. There will be no pedestrian access in construction area. Bicyclists will be allowed to share right highway lanes in both directions with vehicles .
The purpose of this project is to implement a permanent restoration of SR-1 within the project limits, which is approximately 500 feet south of Big Rock Drive. Prior to the Emergency Project in 2016, ocean waves had eroded the existing slope causing the southbound shoulder to become unstable. The shotcrete wall that was placed in the Emergency Project (EA 07-1XA001) was only a temporary measure and is now beginning to be undermined by wave action. This wave action is again endangering the southbound shoulder and southbound right (#2) lane. This project's proposed secant pile wall will be a permanent measure to eliminate the erosion to the slope. The performance measures for this project are one cure-in-place line culvert, 4,025 square feet secant pile wall, 178 feet concrete barrier type 80 (see through) to maintain coastal view, and 600 feet reconstruct and widen northbound shoulder will make shoulder smoother and wider for bicyclists.
May 2022 through July 2023. Utility relocation will take place from September 2021 through October 2022.
All work is subject to change due to weather or construction-related issues.
Other Interested Parties
California Regional Water Quality Control Board, U.S. Army Corps of Engineers, California Department of Fish and Game, California Coastal Act, Mountain Recreation and Conservation Authority
Program Project Costs
Q: What is the SR-1 Permanent Slope Restoration?
A: The permanent slope restoration will replace the existing protection, a shotcrete wall, placed by an Emergency Contract in 2016 with a two-row secant pile wall. The new wall design will utilize two rows of Cast-In-Drilled-Holes (CIDH) piles, reducing the size of the holes, and the size of the W-section beams. Reduction of W-section size will allow smaller equipment to build the wall, reducing construction footprint. The two rows of piles will be connected by a reinforced concrete slab.
Q: What are the general work hours?
A: Monday-Friday: 6:00 a.m. to 9:00 p.m.
Weekend work may be permitted.
Q: Will construction updates be available?
A: Caltrans District 7 posts updates with text, photos, graphics and videos across social media with the hashtag #MalibuSlopeRestore, including Twitter via @CaltransDist7 and Facebook via @CaltransD7. Also, check Caltrans’ Quickmap, for the latest road conditions.
Q: Will this project be noisy at night?
A: Caltrans will monitor noise levels during construction to minimize the impact to local neighborhoods. If you experience excessive noise or dust related to this construction project, please contact Caltrans.
To receive email updates about this project, contact the Caltrans representative shown below.
Public Information Officer