Navigate Up
Sign In
User Login

Project Details

Study Type:Physical Map Revision
The Federal Emergency Management Agency (FEMA) performed detailed coastal engineering analyses and mapping of the San Francisco Bay shoreline within the nine San Francisco Bay Area counties. The analysis and mapping revised and updated the flood and wave data for the Marin County Flood Insurance Study report and Flood Insurance Rate Map panels along the San Francisco Bay shoreline. The revised coastal study became effective on March 16, 2016, and the final FIS report and FIRM panels for this project can be obtained from the Product Catalog on the FEMA Flood Map Service Center (MSC) web site.

Project documents (presentations, meeting minutes, and fact sheets) from the Flood Risk Review meeting (January 17, 2013) and the Preliminary FIRM / Consultation Coordination Officer meeting (April 10, 2014) are located in the menu provided below.
Flooding is the most common disaster in the United States.  Only Federal Flood Insurance reimburses homeowners for flood damage, most homeowners' insurance policies do not cover floods.  For more information about flood insurance or to find a local agent, visit
For questions about flood maps, visit, call 877-FEMA-MAP (877-336-2627) or email
MarinMap has a web page and a GIS application specifically for FEMA flood information, including data a property owner could use when applying for a Letter of Map Change (LOMC). The new BAC Study Base Flood Elevation and Flood Hazard area zone polygons are in the GIS applications as follows: Select the page named “FEMA Flood Hazard Information” under the APPLICATIONS tab on MarinMap at: Click on the link that directs people to one of two GIS applications (one for DeskTop and one for mobile devices). *Please note: Both Base Flood Elevation and Flood Hazard areas are in the public MarinMap Map Viewer application under the HAZARD folder. These are denoted with the suffix “Draft Bay Study” after the map name. Both Base Flood Elevation and Flood Hazard areas are in the members-only MarinMap Data Viewer application under the HAZARD folder (as in the public app).

Increased Flooding Scenario Maps

FEMA has created Increased Flooding Scenario Maps for the interior shoreline for all nine Bay Area counties. These new non-regulatory products complement the National Flood Insurance Program regulatory products, i.e. the Flood Insurance Rate Maps, Flood Insurance Study reports and GIS databases per County. 

To view the Increased Flooding Scenario Maps on FEMA’s GeoPlatform or download GIS data, click here. An informational brochure and FAQ are also available here.

Impacted Areas:Cities of Belvedere, Larkspur, Mill Valley, Novato, San Rafael, and Sausalito; Towns of Corte Madera and Tiburon; Marin County Unincorporated Areas
Major Flooding Sources:San Francisco Bay

 Project Documents

Document NameDocument Date
expand Fact Sheet
City of Belvedere Fact Sheet4/16/2014
City of Mill Valley Fact Sheet4/3/2014
City of San Rafael Fact Sheet4/3/2014
Las Gallinas, Marin County Unincorporated Fact Sheet4/3/2014
Marin County Post Preliminary Fact Sheet6/13/2014
Paradise Cay, Marin County Unincorporated Fact Sheet4/3/2014
expand Letter
Study Update Letter_Belvedere 4.16.134/16/2013
Study Update Letter_Larkspur 4.16.134/16/2013
Study Update Letter_Mill Valley 4.16.134/16/2013
Study Update Letter_San Rafael 4.16.134/16/2013
Study Update Letter_Tiburon 4.16.134/16/2013
expand Minutes
SF Bay Study Marin County Minutes2/19/2013
expand Presentation
Marin Flood Risk Review Meeting Presentation
expand SOMA
City of Belvedere Preliminary SOMA
City of Mill Valley Preliminary SOMA
City of San Rafael Preliminary SOMA
Marin County Preliminary SOMA
Town of Tiburon Preliminary SOMA

 Other FEMA Risk Map projects


Powered by BakerAECOM