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Project Details

Study Type:Physical Map Revision
The Federal Emergency Management Agency (FEMA) is performing detailed coastal engineering analyses and mapping of the San Francisco Bay shoreline within the nine San Francisco Bay Area counties. The analysis and mapping will revise and update the flood and wave data for the Marin County Flood Insurance Study report and 49 Flood Insurance Rate Map panels along the San Francisco Bay shoreline.

On March 24, 2014 the Preliminary Flood Insurance Study and the Preliminary Flood Insurance Rate Maps were mailed to the Marin County, City, and Town Chief Executive Officers (CEOs). FEMA has posted digital copies of the revised FIRM panels, FIS report, and Digital FIRM database to the following website:
A Community Consultation Officer meeting was held with community staff on April 10, 2014. In addition, FEMA representatives attended three community-hosted meetings the week of June 16, 2014.

The proposed Flood Hazard Determinations were published in the Federal Register on May 13, 2014. Following the publication in the Federal Register, the Flood Hazard Determinations were published twice in the legal ad section of the Marin Independent Journal on May 28 and June 4, 2014. The formal 90-day formal appeal period began on June 4, 2014 and ended on September 2, 2014. For more information on Appeals and Protests to National Flood Insurance Program maps, please visit the FEMA library document posted at:, and amendments by way of FEMA Operating Guidance Procedure Memorandum 57, Expanded Appeals Process. Individuals and business owners who have questions or comments regarding the Preliminary Flood Insurance Rate Map should contact their local Floodplain Administrator.

FEMA mailed the Letter of Final Determination (LFD) and final Summary of Map Actions to the affected communities' Chief Executive Officer on September 16, 2015. Approximately two weeks prior to the anticipated effective date (March 16, 2016), the communities will receive a revalidation letter from FEMA. This letter will confirm the Letters of Map Change (LOMC) determination that are still considered valid when the revised Flood Insurance Rate Map (FIRM) panels and Flood Insurance Study (FIS) report becomes effective.

Flooding is the most common disaster in the United States. Homeowners, renters and business owners are encouraged to look at the Preliminary Flood Insurance Rate Maps to become familiar with flood risks in their community. These flood maps can help individuals and businesses make informed decisions about flood insurance options and flood protection measures. 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).

New! 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.

Status:LFD Issued
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


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