Thurston County Flood Hazard Mitigation Plan Update

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.
Are You Prepared 
for Flooding?

Learn about the types of flooding...

We asked residents and business owners how flooding affects them and their property. The county's Flood Planning Committee hopes to learn what folks are doing and what they think the county should do to reduce flood hazards.

Survey Results Coming Soon
Thank you to all those who participated.

Number of Survey Responses

as of July 1, 2017


Survey closed June 30th at 5:00 p.m.
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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

View Thurston County’s Flood Hazard Area Map

Contact Us

  1. For more information contact:

    Paul Brewster
    Senior Planner

    Thurston Regional Planning Council
    2424 Heritage Court SW
    Suite A
    Olympia, WA 98502
    Ph: 360-956-7575