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Project Details

Study Type:Physical Map Revision
Contra Costa County Riverine Physical Map Revision (PMR) includes new flood studies being performed along the following flooding sources: portions of Brushy, Frisk, Kellogg, Marsh, and Mount Diablo Creeks. The update includes a new study of the 10- 50- 100- and 500- year flood events as well as the creation of floodways for the reaches. Additional hydraulic studies using limited detail methodology for a number of flooding source and redelineation (delineating floodplains using the effective profile elevation) using newly available topographic data are also included.
FEMA held a mapping update meeting with Contra Costa County and incorporated areas March 11, 2015 to discuss the Bay Area Coastal (BAC) study progress and the schedule impacts of the riverine PMR preliminary issuance.  The presentation slides can be accessed from the project documents section of this site. 
FEMA distributed the preliminary FIRM panels, Flood Insurance Study (FIS) report, Summaries of Map Action (SOMA), and GIS database for Contra Costa County and incorporated areas on June 12, 2015.  Products may be accessed using the link below:
FEMA held a Consultation Coordination Officer (CCO) meeting with Contra Costa County and incorporated areas July 29, 2015 to discuss and answer questions on the preliminary FIS and FIRM.  The presentation and meeting minutes can be accessed from the project documents section of this site.
Please continue to check this webpage for more information regarding the Contra Costa County Riverine PMR.
​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
Impacted Areas:Cities of Antioch, Brentwood, Clayton, Concord, El Cerrito, Hercules, Lafayette, Martinez, Oakley, Pinole, Pittsburg, Richmond, San Pablo, Walnut Creek, Town of Danville, and Contra Costa County (Unincorporated Areas)
Major Flooding Sources:Brushy Creek, Frisk Creek, Kellogg Creek, Marsh Creek, and Mount Diablo Creek

 Project Documents


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