US-101 Rockslide Repair DO (EA 04-1V300)
Summary
SCH Number
2026070332
Public Agency
California Department of Transportation, District 4
(DOT)
Document Title
US-101 Rockslide Repair DO (EA 04-1V300)
Document Type
NOE - Notice of Exemption
Received
Posted
7/9/2026
Document Description
Caltrans proposes repairing a rockslide that occurred on southbound US-101, just south of Waldo Tunnel, at post mile (PM) 0.4. The rockslide occurred as a result of a storm and released an estimated 2,000 cubic yards of rock and debris, overtopping the existing k-rail and entering the traveled way. The slide is approximately 40 feet wide and 200 feet long. Field Maintenance crews responded the same day as the incident by clearing debris and restoring roadway access. Inspections after the incident identified approximately 220 feet of damaged k-rail as well as a damaged 4-foot-high fence that was mounted on the barrier. The slope remains unstable, with loose and overhanding rocks at risk of falling. This condition necessitates immediate slope repair to uphold the integrity and usage of the State Highway System. Construction will involve removing loose material and overhanging rock on the slope and rocks and boulders behind the k-rail. The slope will be graded to restore stability and grade. The damaged 4-foot-high fence that is mounted on top of the barrier will be replaced and the damaged k-rail will be repaired or replaced. Any damaged or impeded drainage will be reestablished. Temporary traffic control will be implemented during construction.
Contact Information
Name
Juliane Smith
Agency Name
Caltrans
Job Title
Senior Environmental Scientist (NEPA/CEQA Specialist)
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project
Address
Phone
Email
Location
Cities
Unincorporated Marin County
Counties
Marin
Regions
Northern California, San Francisco Bay Area
State Highways
101
Other Location Info
The project is located on southbound US-101, just south of Waldo Tunnel, at post mile (PM) 0.4.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
PRC 21084; 14 CCR 15301 Class 1
Reasons for Exemption
Class 1 Existing Facilities. The project is not anticipated to result in any environmental impacts. The project contains a number of standardized project measures which are employed on most, if not all, Caltrans projects and were not developed in response to any specific environmental impacts resulting from the project.
County Clerk
Marin
Attachments
Notice of Exemption
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