State Route 26 Slope Stabilization

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Project Facts


The California Department of Transportation proposes to stabilize deteriorating slopes and improve drainage on both sides of State Route 26 at eight locations in Calaveras County from about 5.4 miles west of Ridge Road to about the Amador County line (post mile 21.4 to post mile 38.31). The project will upgrade drainage in the project area with a combination of geotechnical, hydraulic, and landscape measures such as flattening cut slopes, refilling slopes that are collapsing, and stabilizing shoulders with a bonded fiber matrix of hydroseed and fiber roll. In addition, retaining walls will be constructed at five locations (Locations 2-6).

This project has two alternatives—a Build Alternative and a No-Build Alternative—that are being considered.


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Project Benefits


The purpose of the project is to lessen slope erosion that causes slope failure and slope erosion along the embankment of the eastbound and westbound lanes of State Route 26.


The rugged topography, limited state right-of-way, and environmental sensitivity of the Calaveras corridor pose challenges for the California Department of Transportation crews to keep this area maintained. Slope failures and soil erosion have occurred in the embankment of the eastbound and westbound lanes of State Route 26 over the last few years. Numerous maintenance tasks have been performed in the past decade to control erosion and improve slope stability and drainage along this corridor. The project is needed to protect the roadway’s numerous slopes within the project limits from continually eroding and collapsing.

Estimated Funding Breakdown

Construction Cost: The project’s estimated cost is $10,750,000

Proposed Project Schedule

Final Environmental document to be completed: 12/1/2020
Right of way acquisition to be completed: 8/1/2022
Design to be completed: 10/1/2021
Advertise: 8/1/2022
Construction to begin: 2/2/2023
Construction to be completed: 2/2/2026

Project Contact

District 10
Public Information Office: (209) 948-7543


Final Initial Study with Mitigated Negative Declaration - December 2020 (PDF) 2,786 KB