The Transportation Authority of Marin has actively engaged project stakeholders to collectively develop a series of multi-modal improvements that increase the operational efficiency and safety of the Highway 101 Greenbrae/ Twin Cities Corridor for all users, including motorist, bicyclists, pedestrians and transit riders. Funding is provided from the Regional Measure 2 Program, a $1.00 increase in bridge tolls on bay area bridges approved by voters in 2004.
Greenbrae Corridor Advisory Working Group
A Greenbrae Corridor Advisory Working Group has been formed to explore a range of options and strives to agree on a recommendation for the Greenbrae Corridor Improvement Project. Click here to view TAM's calendar, or click here to see upcoming Working Group meetings exclusively.
In an effort to provide interested stakeholders with information discussed during the Advisory Working Group Meetings TAM will begin to video record the meetings and post them to this webpage. The first meeting recorded is from our May 6, 2013 Working Group Meeting. View meeting #4 held May 6,2013 https://www.youtube.com/watch?v=Bs9HCJIkE20
A number of interested stakeholders have expressed a desire to submit an alternative transportation improvement proposal for further consideration by the Advisory Group. To assist TAM in our evaluation process we are asking parties who are interested in submitting an option to complete this form and attach it to your proposal. We are asking all proposals be submitted to TAM on or before May 28, 2013. Download New Option Submittal Worksheet.
The Greenbrae/Twin Cities Corridor has many non-standard highway features that have caused congestion in the corridor over many decades. View a sample at the southbound Sir Francis Drake Boulevard onramp "weaving" with traffic exiting the highway at Lucky Drive. The video was taken January 23, 2013 at 7:30AM. http://youtu.be/1upP8LklkOU
Draft Environmental Document
TAM, in partnership with the lead agency Caltrans, is please to announce the release of the Draft Environmental Document for the Highway 101 Greenbrae/Twin Cities Corridor Improvement Project in compliance with the National Environmental Policy Act (NEPA) and the California Environmental Quality Act (CEQA). The Initial Study (with Proposed Mitigated Negative Declaration)/ Environmental Assessment is available for review
The document is presented on this project web page and has been broken down into smaller files that can be downloaded for review. Please be patient while the files download. You will see a white screen until file fully loads.
0 Cover Pages_Table of Contents (0.2MB)1 Intro_Purpose and Need_Project Description_Permits (5.4MB)2 Issues with No Effect_Land Use (Part 1) (7.4MB)3 Land Use (Part 2)_Growth_Community Impacts (Part 1) (9.0MB)4 Community Impacts (Part 2)_Utilities_Traffic_Visual (Part 1) (10.7MB)5 Visual (Part 2) (9.8MB)6 Visual (Part 3) (7.2MB)7 Visual (Part 4) (11.8MB)8 Visual (Part 5)_Cultural Resources (5.7MB)9 Hydrology_Water Quality_Geo_Paleo_Hazmat_Air Quality_Noise (Part 1) (7.6MB)10 Noise (Part 2) (9.4MB)11 Noise (Part 3) (0.4MB)12 Natural Communities_Wetlands_Plants_Animals_Threatened_Endangered_Invasive (0.5MB)13 Cumulative Impacts_Climate Change (1.6MB) 14 Comments and Coordination_Preparers_Distribution (0.2MB) 15 Appendices (12MB)
Technical Studies
1 Visual Impact Assessment Report (5.5MB)2 Air Quality (4.1 MB)3 Natural Environment Study (NES) (6.5MB)4 NES Appendices B-H (4.2MB)5 NES Wetland Delineation 1 (1.4MB)6 NES Wetland Delineation 2 (8.8MB)7 NES Wetland Delineation 3 (6.1MB)8 Paleontology (0.8MB)9 Hazardous Material Phase 1 (5.0MB)10 Hazardous Materials Appendices (8.0MB)11 Hazardous Materials Addendum (7.1MB)12 Location Hydraulic Study 3.1MB)13 Water Quality (1.4MB)14 Noise Study (1.4MB)15 Community Impact Assessment (2.5MB)16 Traffic Operations Report (TOR) (13.6MB)17 TOR Appendices A-D (9.3MB)18 TOR Appendices E-H (5.6MB)19 Preliminary Geotechnical Report (0.5MB)
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TAM has prepared two animations of the proposed improvements within the corridor. One view is a "fly-thru" perspective and the other view is from a driver's perspective traveling along the highway. Both animations can be viewed using the following web links:
Fly-Thru: http://www.youtube.com/embed/RtaEVbK4gXM"
Driver's View: http://www.youtube.com/embed/z7xK-Ck3-No"
Previous Project Activities
Project Open House - September 17, 2012
The Transportation Authority of Marin (TAM) in cooperation with the California Department of Transportation (Caltrans), Marin County, the City of Larkspur, and the Town of Corte Madera, hosted an informational open house for the proposed Highway 101 Greenbrae/Twin Cities Corridor Improvement Project . The open house was very well attended by residents interested in learning more about the project as they reviewed the exhibit boards and watched a simulation of the improvements to the highway corridor. TAM staff and our consulting team were on hand to respond to comments and questions that ranged from a simple clarification of a design element to an explanation as to what are the next steps in the development process.
Review the Open House Exhibit Boards (2.5MB)
A number of questions from stakeholders focused on the proposed pedestrian and bicycle elements within the Corridor. To highlight the extensive multi-modal improvements that have been designed into the project TAM has prepared an exhibit of new and relocated bus stops and the non-motorized network of connecting paths, sidewalks, and bike lanes.
Review Multi-Modal Exhibit Board (7.7MB)
CLICK HERE FOR A DETAILED PLAN SHOWING CORRIDOR IMPROVEMENTS (9.5MB)
On March 17, 2011 the Caltrans District Director approved the Project Study Report (PSR). The PSR is a document that defines the project scope, cost and schedule which is then used as the basis for developing the engineering design and environmental document. By reaching this significant milestone TAM, Caltrans and our surrounding stakeholders can now focus on developing and refining the proposed options that will ultimately improve the operations and safety of the roadway network, improve access and use of public transit and improve a network of pedestrian and bicycle facilities in the Greenbrae Corridor.
Read the Project Study Report. This report contains a number of lengthy attachments which are available for review at the TAM office. Contact the staff member listed below to schedule an appointment to review the attachments
Public Open House and Scoping Meeting (September 2009)The Transportation Authority of Marin, in cooperation with the Department of Transportation hosted an informational open house and scoping meeting on Tuesday September 29, 2009 to provide a project update on our recent progress and to announce the initiation of the environmental phase. The event was well attended by over 120 interested stakeholders. A series of stations were set up with display exhibit boards that presented and described the project development process. TAM continues to work with the community to develop a suite of integrated multi-modal transportation improvements to improve mobility for all users within the corridor. The improvement options under consideration were on display for review and discussion.
Report from the TAM Board Meeting November 19, 2009The TAM Board acknowledged recent comments received from the public, the Town of Corte Madera, and the City of Larkspur expressing concerns regarding the final phase of the proposed southbound improvement alternative. The Chair stated his appreciation for all affected parties to listen, participate and develop the best alternatives for all users of the corridor. The Board recognized areas of community consensus and the recent progress made to develop the multi-modal improvement alternatives. The Board also recognized areas of disagreement and recommended the limits of the project be modified to allow remaining improvements to be studied further. This direction effectively removes the proposed final phase of the southbound improvement option from further development and study. Favorable community consensus was expressed on the northbound improvement option (Option “E”) for further study. TAM and our partners will continue to work closely with Caltrans to advance the improvement options still under consideration as part of the environmental analysis.
View the staff report, presentation (1.6MB), or meeting minutes (Item No. 11) (2.4MB)from the November 19, 2009 Board Meeting.
Staff Contact:Bill Whitney, P.E.Phone: (415) 226-0823Email: bwhitney@tam.ca.gov
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