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Flood in Multnomah County, Oregon
13 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
Multnomah County, Oregon, has 13 flood events in the NCEI record since 1950, with at least one in 9 different years.
January is the busiest month, with 4 of the recorded events. The last 20 years account for 12 events against 1 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.5% of the 846 flood events recorded in Oregon; its 3.0 per 100 square miles compares with 0.9 statewide.
Compared with Oregon
| Measure | Multnomah County | Oregon | US |
|---|---|---|---|
| Flood events since 1950 | 13 | 846 | 183,559 |
| Per 100 square miles | 3.0 | 0.9 | 5.2 |
| Per 10,000 residents | 0.2 | 2.0 | 5.5 |
| Deaths recorded | 0 | 24 | 2,961 |
| Busiest month | January | December | June |
By year
Seasonality
4Feb
0Mar
0Apr
0May
1Jun
1Jul
0Aug
1Sep
1Oct
0Nov
3Dec
2
Recorded events
All 13 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 11 Jun 2022 | Flood | — | — | — | — | — | County |
| 12 Nov 2021 | Flood | — | — | — | — | — | County |
| 13 Jan 2021 | Flood | — | — | — | — | — | County |
| 4 May 2017 | Flash Flood | — | — | — | — | — | County |
| 7 Dec 2015 | Flood | — | $1.1M | — | — | — | County |
| 28 Sep 2013 | Flood | — | $30K | — | — | — | County |
| 19 Jan 2012 | Flood | — | — | — | — | — | County |
| 7 Nov 2009 | Flood | — | — | — | — | — | County |
| 7 Nov 2009 | Flood | — | — | — | — | — | County |
| 2 Jan 2009 | Flood | — | — | — | — | — | County |
| 2 Jan 2009 | Flood | — | — | — | — | — | County |
| 3 Dec 2007 | Flood | — | — | — | — | — | County |
| 25 Aug 2004 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Multnomah County had?
13 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Multnomah County?
11 Jun 2022 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Multnomah County?
The flood of 7 Dec 2015, with property damage estimated by NCEI at $1.1M.
How does Multnomah County compare with Oregon for flood?
3.0 events per 100 square miles against 0.9 statewide; the county holds 13 of the state's 846 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.