US-101 Ramp Metering Equipment Repair and Replacement DDO (EA 04-4X910)
Summary
SCH Number
2025120486
Public Agency
California Department of Transportation, District 4
(DOT)
Document Title
US-101 Ramp Metering Equipment Repair and Replacement DDO (EA 04-4X910)
Document Type
NOE - Notice of Exemption
Received
Posted
12/11/2025
Document Description
Caltrans proposes repairing, replacing, and reactivating ramp metering equipment on US-101 in Sonoma County from post mile (PM) 2.69 to 4.88. The project will ease mainline traffic and congestion along this stretch of US-101. With the upcoming completion of the Marin-Sonoma Narrows Phase 7B HOV lanes project, and the completion of the HOV Traffic Analysis Study sponsored by the Metropolitan Transportation Commission (MTC), Transportation Authority of Marin (TAM), Sonoma Count Transit Authority (SCTA), and Caltrans, the existing ramp metering equipment will need to be upgraded, repaired, and restored to ensure an efficient freeway system that operates at or near capacity. The current ramp metering equipment is missing or outdated. The project will include activities such as repair and installation of loop detectors, flashing beacons, advanced warning signals, signs, and ramp metering foundations, as well as striping, at five locations. Traffic control will be required 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
Petaluma
Counties
Sonoma
Regions
Northern California, San Francisco Bay Area
State Highways
US-101
Other Location Info
The project is located along US-101 in the City of Petaluma from post mile (PM) 2.69 at Kastania Road to PM 4.88 at westbound East Washington Street.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
PRC 21084; 14 CCR 15301 Class 1(d)
Reasons for Exemption
Class 1(d) 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
Sonoma
Attachments
Notice of Exemption
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