Monthly Construction Update (Posted April 15, 2015)
Check out the progress being made on the Marin Sonoma Narrows project
The Narrows on US Highway 101 (US101) is a nationally and regionally significant highway linking the San Francisco Bay Area and Oregon and is the only continuous north/south route through Marin and Sonoma Counties. The State has designated the Narrows as an inter-regional route of significance, and Highway 101 is listed as a Focus Route in California’s 1998 Interregional Transportation Strategic Plan. As a result of these designations the MSN Project has been the recipient of state discretionary funding on four separate occasions. The MSN Project is also included in the 2010 Regional Transportation Plan and the 2002 Key Transportation Corridors in the Bay Area Region.
The existing US101 through the Narrows has two lanes in each direction, has sections that do not meet current freeway standards and consistently maintains a poor level of service in many sections. The MSN Project will widen approximately 17 miles of US101 from four to six lanes by adding one high occupancy vehicle (HOV) lane in each direction; create a controlled access freeway section through the historic “Narrows”, and upgrading the highway generally to current freeway standards from Route 37 in Novato (Marin County) to Old Redwood Highway in Petaluma (Sonoma County). It is part of the overall regional plan to provide continuous HOV lanes through Marin and Sonoma Counties.
Caltrans developed an Environmental Impact Statement/Environmental Impact Report (EIS/EIR) for the entire project. On August 5, 2009, the Final EIS/EIR document was made available on the Caltrans website.
In May 2008, the California Transportation Commission (CTC) awarded $66.04M in Inter-regional Transportation Improvement Program (ITIP) funding to the project. In 2012, the CTC increased the Proposition 1B Corridor Mobility Improvement Account (CMIA) funds from $82.4 million to $172.6 million in addition to previously committed federal, state and regional funding. This increases available funding to nearly $398 million out of an estimated $745 million total project cost.
TAM, the Sonoma County Transportation Authority (SCTA), and Caltrans have developed the following projects which make up the Phase 1 Project. They are:
A continuous bike route is also planned through all projects by utilizing a combination of class I and II bike lanes.
Staff Contact:Nicholas Nguyen, PEPhone: (415) 226-0831Email: email@example.com
Additional information can be found on the Caltrans District 4 project website.
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