Oregon Flood Hazard Profile
Hazard Data · Model Version 2.5
Overview
Oregon experiences riverine flooding along the Willamette, Columbia, and Rogue river systems, plus urban flooding from intense winter storms. Atmospheric rivers drive the majority of major flood events in the state. Post-wildfire debris flow hazard is an increasing concern following large fire seasons.
In the Historical Record
Counted from the records this platform holds. A figure is shown only where the underlying dataset could be read.
County by County in Oregon
What federal records show has happened in each county: storms, disaster declarations and flood insurance claims. The counties below have the longest NOAA storm records in Oregon.
Notable Historical Events
Hazard Scoring Approach
Calchis computes a Calchis 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 Oregon address to see location-specific flood hazard scoring with full methodology transparency.
Open Live Map — OregonData Sources
Related
Monitoring flood exposure in Oregon?
This page is a state-level profile. Calchis scores individual addresses, tracks live flood events against your own locations, and alerts you when one approaches them.
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Calchis Hazard Score — derived from federal and academic sources listed above. Property exposure data not included. Not a substitute for professional actuarial assessment. Decision-support intelligence — not a primary alerting or dispatch system. Verify against official sources.