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Thurston County, Washington

The content on the Thurston County website is currently provided in English. We are providing the “Translation” for approximately 10 languages. The goal of the translation is to provide visitors with limited English proficiency to access information on the website in other languages. The translations do not translate all types of documents, and it may not give you an exact translation all the time. The translations are made through an automated process, which may not result in accurate or precise translations, particularly of technical and legal terminology.

Community Planning and Economic Development

The County is working on an update to the Flood Hazard Mitigation Plan to be completed in 2025. Please visit this page for future updates.

County Flood Programs & Information

Floods are the most common natural hazard in Thurston County. Our average annual rainfall of 50 inches can lead to river, stream, and groundwater flooding.  Many County departments provide programs and services to help citizens keep themselves, and their property safe. Find links to available information and programs below.

Emergency Alerts 
Sign up to receive text or email alerts about hazardous conditions, including flooding.

Flooding Links and Information

Thurston County is in the process of updating the Flood Hazard Mitigation Plan, with an expected completion date of 2025.


Existing Plans and Information:

The County regulates construction in flood hazard areas to protect residents and property from flooding. These standards also preserve floodplains as a natural means of flood control.  

The Emergency Management department can help you prepare for flood season.

If you live in a flood hazard area of unincorporated Thurston County, consider investing in flood insurance.  Insurance through the National Flood Insurance Program is available in Thurston County.  Please be advised, there is a 30-day waiting period before your policy may go into effect.  Thurston County government is active in the Federal Emergency Management Act (FEMA) Community Rating System, which means you may be eligible for a discount.  Be proactive and buy flood insurance before you need it.

Use a County map to see if a Thurston County property address or parcel is within a mapped flood hazard area.  Our staff work hard to make great maps, but they do not meet engineering, legal or survey standards. Consult with experts before making decisions.

Find information on flood-related health issues, clean-up guidelines, water purification and food safety. 

County staff monitor rainfall and water levels throughout the County. Check current water levels for Thurston County rivers and lakes by going to a site below.

To find out up to date information on road closures or to report a road hazard issue, please go to the link below.  Turn around, don't drown! Do not drive in flooded areas.

The County's Public Works Water Resources Division actively manages the County's system of storm drains, pipes and ponds (also called stormwater facilities) making sure they move millions of gallons of rainwater runoff away from County homes and roads.  Learn how to find and properly prepare your neighborhood stormwater facilities for the rainy season.