Welcome to Caltrans District 4

101 Widening and HOV in the Town of Windsor

This project has been Completed

US 101 Widening and HOV project from Steele Lane in Santa Rosa to Windsor River Road in the Town of Windsor

The Project
The U.S. 101 High-Occupancy Vehicle (HOV) Lanes – North Phase A Project proposes to widen U.S. 101 from four to six lanes to expand about 7.6 miles of high-occupancy vehicle (HOV) lanes from Steele Lane in Santa Rosa to Windsor River Road in Windsor. The project also corrects substandard features, adds auxiliary lanes, provides ITS elements, and rehabilitates the existing pavement. Right-of-way is a minimal, and sound walls are not included in the Phase A project. This project will complete one of the remaining portions of the planned continuous U.S. 101 HOV lanes system. 101 Windor Map

The Need
The 101 corridor is a lifeline for Northern California commuters and commerce, connecting San Francisco and the East Bay with Marin County and the rapidly-growing Sonoma and Mendocino Counties.

This project will increase capacity, decrease commute times for drivers, and enhance safety by meeting current freeway standards and operational requirements.

This project is developed through a partnership between Sonoma County Transportation Authority (SCTA) and the California Department of Transportation (Caltrans). Project sponsors include local, state, and federal agencies.

Project Status
Pre-construction work, such as tree removal, began in January of 2009. Construction started on April 16, 2009.

The total costs for the project is estimated at $120 million. The project is funded by SHOPP, CMIA, Fed-Demo and Sonoma County Measure M funds.

PAED* 3,500
PS&E* 6,000
R/W Sup 500
CON Sup 12,000
R/W Capital 7,060
CON Capital 91,200
Total 120,260

Project Schedule
Start Construction: January 2009
Finish Construction: January 2011

The U.S. 101 HOV Lanes – North Phase A Project will serve to alleviate existing and projected congestion along this corridor. It will also upgrade the facility to enhance safety and meet operational requirements.