Clackamas County, Oregon: Natural Disaster Risk and History
Clackamas County, Oregon has a Relatively High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 94.9 out of 100, higher than about 94% of US counties, with earthquakes, volcanic activity and landslides scoring highest of its 18 hazards and $219 million a year in expected losses.
OpenFEMA lists 21 federal disaster declarations that included Clackamas County since 1964, not counting 2 for COVID-19; the latest is DR-4907-OR (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides, declared 7 April 2026). NOAA's Storm Prediction Center recorded 8 tornadoes touching Clackamas County from 1950 to 2025.
Live weather alerts for Oregon All official warnings Latest FEMA declarations
Population 421,252 Buildings worth $104 billion Area 1,902 sq mi Risk rank in Oregon 6 of 36 FIPS 41005
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Earthquake | Relatively High | 98.6 | $109 million | about once every 67 years | — |
| Volcanic activity | Relatively Moderate | 95.8 | $494,889 | about once every 81 years | 11 |
| Landslide | Relatively Moderate | 95.8 | $209,871 | about 1.9 a year | — |
| Heat wave | Relatively Moderate | 95.5 | $8.5 million | about 4.9 a year | 77 |
| Cold wave | Relatively High | 95.2 | $15 million | about once every 2.6 years | 7.2 |
| Inland flooding | Relatively High | 93.7 | $77 million | about once every 1.1 years | 26 |
| Strong wind | Relatively High | 93.4 | $3.3 million | about once every 13 years | 3 |
| Ice storm | Relatively High | 90.9 | $1.3 million | about 1.1 a year | 75 |
| Wildfire | Relatively Low | 86.8 | $1.1 million | rarer than once in 1,000 years | — |
| Avalanche | Relatively High | 86.5 | $1.5 million | about once every 7.5 years | 4 |
| Winter weather | Relatively High | 85.4 | $367,577 | about 26 a year | 495 |
| Lightning | Relatively High | 83.2 | $1.1 million | about 8.4 a year | 90,558 strikes |
| Tornado | Relatively Low | 38.1 | $1.0 million | about once every 6.8 years | 5 |
| Hail | Very Low | 31.6 | $165,182 | about once every 7.8 years | 4.9 |
| Coastal flooding | Very Low | 18.8 | $200 | about once every 3.2 years | — |
| Drought | Very Low | 14.1 | $378 | about 6.8 a year | 343 |
| Hurricane | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 21
Most common: Severe Storm 8, Fire 7, Flood 4, Coastal Storm 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Flood |
| 1970s | 2 | Flood ×2 |
| 1990s | 2 | Flood, Earthquake |
| 2000s | 4 | Severe Storm ×3, Coastal Storm |
| 2010s | 3 | Severe Storm ×2, Fire |
| 2020s | 9 | Fire ×6, Severe Storm ×3 |
The last 10
Widest declarations that included Clackamas County
- Hurricane Katrina Evacuation (2005, EM-3228-OR): 36 Oregon counties designated.
- Heavy Rains & Flooding (1964, DR-184-OR): 36 Oregon counties designated.
- Severe Winter Storms (2004, DR-1510-OR): 30 Oregon counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Oregon also had 33 statewide declarations with no county list.
Tornado record since 1950 8
| Tornadoes touching the county | 8 |
|---|---|
| Strongest-rated | (E)F1 ×3 |
| Peak month | October (6) |
| Deadliest | — |
| Longest path | 12 Apr 1957, F1, 2.5 mi path |
| Most recent | 22 Oct 2022, EF0, 0.9 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 5 | 3 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 0 | 0 | 1 | 1 | 3 | 0 | 2 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Clackamas County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Clackamas County (this page) | — | Relatively High | 94.9 | Earthquake |
| Multnomah County | 43 km | Relatively High | 98.5 | Earthquake |
| Marion County | 43 km | Relatively High | 95.5 | Earthquake |
| Hood River County | 58 km | Very Low | 32.1 | Volcanic activity |
| Clark County, WA | 69 km | Relatively Moderate | 92.2 | Earthquake |
| Washington County | 80 km | Relatively High | 96.0 | Earthquake |
Nearest by distance between county centres. Every county in Oregon, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 13.4 |
|---|---|
| Community resilience | Relatively High 69.1 |
| Community risk factor | 0.82 |
| Expected annual loss, all hazards | $219 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Clackamas County's main hazards
- Right now: National Weather Service alerts for Oregon · all official warnings on Global Incident Tracker.
- Earthquake: Earthquakes today · Earthquake safety guide
- Volcanic activity: US volcano alerts
- Landslide: Landslides recorded
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Clackamas County
What natural disasters is Clackamas County, Oregon most at risk from?
Clackamas County, Oregon has a Relatively High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 94.9 out of 100, higher than about 94% of US counties, with earthquakes, volcanic activity and landslides scoring highest of its 18 hazards and $219 million a year in expected losses.
How many federal disaster declarations has Clackamas County had?
OpenFEMA lists 21 federal disaster declarations that included Clackamas County since 1964, not counting 2 for COVID-19; the latest is DR-4907-OR (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides, declared 7 April 2026). Another 33 Oregon declarations were made statewide without a county list.
How many tornadoes have hit Clackamas County?
NOAA's Storm Prediction Center recorded 8 tornadoes touching Clackamas County from 1950 to 2025.
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.