Highway 101 Widening and Improvements Project-Old Redwood Highway to Rohnert Park Expressway

9 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 4
Document Title
Highway 101 Widening and Improvements Project-Old Redwood Highway to Rohnert Park Expressway
Document Type
NOP - Notice of Preparation of a Draft EIR
Present Land Use
Document Description
The project extends along Highway 101 in Sonoma County between Old Redwood Highway in Petaluma and the Rohnert Park Expressway in Rohnert Park, a distance of 10.3 km (6.4mi). The following improvements are proposed within the project limits. Widening in the median to provide high occupany vehicle (HOV) lanes in each direction; widening along the outside to provide auxiliary lanes a required to facilitate weaving traffice movements between the State Route (SR) 116-Gravenstein Highway and Rohnert Park /Expressway interchanges; shifting the alingment of a portion of Redwood Drive if analysist determines auxiliary lanes are needed; reconfiguration of the northbound SR 116 to Highway 101 entrance ramp to improve safety; modified ramp geometry at the Old Redwood Highway interchange; modified freeway on-ramps to accommodate future ramp metering and HOV preferential lanes; northbound climbing lane over the Cotati Grade to improve safety, improve operations and facilitate truck movements; modifications or Railroad Avenue to provide a full or partial interchange (optional component); and modifications of structures and use of retaining walls as necessary to accommodate highway improvements.

Contact Information

Rey Centeno
Agency Name
Department of Transportation, District 4
Contact Types
Lead/Public Agency


Cotati, Petaluma, Rohnert Park
Cross Streets
Old Redwood Highway, SR 116/Rpjmert Park/Expressway

Notice of Completion

State Review Period Start
State Review Period End
Development Types
Transportation:Other (Highway Widening/Improvements)
Local Actions
State Reviewing Agencies
Air Resources Board, Transportation Projects, California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Department of Toxic Substances Control, Department of Water Resources, Office of Emergency Services, California, Resources Agency

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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