Thurston County Flood Hazard Mitigation Plan

Record Chehalis River Basin floodwaters flowed over U.S. Hwy 12 and Anderson Road, impacting businesses and homes in southwest Thurston County. December 4, 2007.

The Board of County Commissioners adopted the Thurston County Flood Hazard Mitigation Plan on October 3, 2017

View the public comments (PDF)

For more information, contact: 

Mark Biever
CRS Coordinator
Thurston County Community Planning and Economic Development
Water and Hazards Data Services Lead

What's New

In Case You Missed It

Community Meeting #2 Meeting Materials 

View and Download Meeting Materials from the August 31 Community Flood Awareness & Planning Open House Meeting #2

The Results Are In

Thurston County Flood Hazards Community Survey  

View the Flood Survey Results...


Surveys received

May 15 - June 30, 2017

 Flooding is Thurston County’s most common natural hazard. The county has been included in 16 flood related federal disaster declarations since 1953. Enlarge Map


From May through October 2017, Thurston County is updating its Flood Hazard Mitigation Plan. The plan update process is an important opportunity for Thurston County government, residents, business owners, and other stakeholders to evaluate its flood risks, past and present flood management efforts, assess additional flood management practices, and prioritize appropriate strategies for the county to become more resilient to flooding.

Learn more about the flood plan update process

Floods in Thurston County are the most common natural hazard, and on an annual average basis, the costliest. The December 2007 Chehalis River floods closed 44 county roads, affecting nearly 400 households. 267 county residents applied to the Federal Emergency Management Agency (FEMA) for assistance with property damage claims totaling nearly $6 million. The January 2009 floods caused nearly $3 million in damage to homes.

Between 1953 and 2016, Thurston County received 16 federal disaster declarations involving flooding – that’s half of the total flood-related declarations, statewide! Such events demonstrate that Thurston County needs to address flood hazards on a countywide basis. 

Learn more about the types of flooding that impact Thurston County

Contact Us

  1. Paul Brewster
    Senior Planner

    Thurston Regional Planning Council
    2411 Chandler Court SW
    Olympia, WA 98502
    Ph: 360-956-7575