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FloodWA

Washington Flood Hazard Profile

Climate-Adjusted Hazard Data · Model Version 1.0

Overview

Washington experiences riverine flooding from atmospheric river events and snowmelt, particularly in the Skagit, Nooksack, and Chehalis river valleys. Urban flooding affects the Puget Sound metro area. Lahar hazard from Mount Rainier represents a unique volcanic-flood compound risk for the Puyallup and Nisqually valleys.

Notable Historical Events

12007 Chehalis River Flood — I-5 closed for days, $165M+ damage (FEMA DR-1734)
22009 January Floods — widespread flooding across western WA (FEMA DR-1817)
32021 Nooksack River atmospheric river flood — Sumas Prairie flooding

Hazard Scoring Approach

CivilSense computes a Climate-Adjusted Hazard Score (0–10) for flood hazard at any US address. The score is composed of weighted sub-components derived from federal data sources and published research. All score components are transparent and returned in API responses.

These are hazard scores — physical intensity likelihood only. They do not include property exposure or vulnerability data. We never call a hazard score a risk score. See the full methodology for scoring details.

Analyze Your Address

Enter any Washington address to see location-specific flood hazard scoring with full methodology transparency.

Open Live Map — Washington

Data Sources

FEMA National Flood Hazard Layerwww.fema.gov
NOAA AHPS River Gaugeswater.weather.gov
USGS Volcano Hazards Program — Laharswww.usgs.gov

Related

Washington WildfireWashington EarthquakeFlood Methodology

Climate-Adjusted Hazard Score — derived from federal and academic sources listed above. Property exposure data not included. Not a substitute for professional actuarial assessment. For situational awareness only — not for emergency response.

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Decision-support intelligence — not a primary alerting or dispatch system. Verify against official sources before operational use.

Data: USGS · NOAA · FEMA · NASA FIRMS · NIFC