Coastlands II Retaining Wall
Caltrans proposes to replace the failed Coastlands II Retaining Wall and add barrier systems for traveler safety on State Route 1. Other work would include removing the existing soil nail wall, rebuilding the drainage inlet and culvert near the southern terminus of the existing wall, restoring the roadway, and removing vegetation and trees within the area where the wall and railing would be constructed. Project activities would occur on State Route 1 at post mile 44.34 in Monterey County, roughly 1.1 miles south of Pfeiffer Canyon Bridge near Big Sur.
The purpose of this project is to stabilize a failing slope that is threatening the highway facility and improve safety for motorists and cyclists traveling along State Route 1 in Big Sur. Excess water from large rain events can degrade the steep embankment slopes that are characteristic of the Big Sur region. Slope failure due to oversaturation can lead to instability of the roadway surface, which would undermine the functional use of the southbound travel lane. The project would minimize the potential for future rain events to compromise the stability of State Route 1 through the project limits. The installation of continuous barrier railing throughout the project limits next to the southbound shoulder would improve safety for travelers by reducing the risk of running off the road due to collision, road alignment, or operating conditions.
The project is needed to address the failure of the existing retaining wall. As a result of the January 27, 2021, storm that passed over the Big Sur Coast, the soil behind the mechanically stabilized embankment wall on State Route 1 at post mile 44.34 became oversaturated and caused the retaining wall to fail. The slope has continued to degrade after the failure of the mechanically stabilized embankment wall, which threatens the paved highway and the private waterline located just below the wall. There is no permanent barrier railing installed along the seaward side of the highway through the project limits, and district traffic safety recommends closing the gap between the installations of barrier railing at the Coastlands and Coastlands II retaining walls.
Estimated Funding Breakdown
|Funding Source||Funding Amount|
Proposed Project Schedule
|Final environmental document to be completed||October 2023|
|Right-of-way acquisition to be completed||November 2024|
|Design to be completed||January 2025|
|Construction to begin||January 2026|
|Construction to be completed||October 2026|
Lara Bertaina, Senior Environmental Scientist
Phone: (805) 779-0792
Carla Yu, Project Manager
Phone: (805) 835-6349
Public Information Office, Caltrans District 5
Phone: (805) 549-3138
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