Sevier County, Utah: Natural Disaster Risk and History
Sevier County, Utah has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 22.7 out of 100, higher than about 22% of US counties, with earthquakes, avalanches and landslides scoring highest of its 18 hazards and $10 million a year in expected losses.
OpenFEMA lists 7 federal disaster declarations that included Sevier County since 1977, not counting 2 for COVID-19; the latest is FM-5600-UT (Monroe Canyon Fire, declared 16 July 2025). NOAA's Storm Prediction Center recorded 2 tornadoes touching Sevier County from 1950 to 2025.
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Population 21,466 Buildings worth $4.7 billion Area 1,938 sq mi Risk rank in Utah 16 of 29 FIPS 49041
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 Low | 87.0 | $4.2 million | about once every 62 years | — |
| Avalanche | Relatively Moderate | 82.0 | $690,952 | about once every 6.0 years | 5 |
| Landslide | Relatively Low | 79.8 | $19,527 | about 2.5 a year | — |
| Wildfire | Relatively Low | 78.6 | $452,150 | about once every 465 years | — |
| Lightning | Relatively Moderate | 71.1 | $657,114 | about 45 a year | 87,294 strikes |
| Winter weather | Relatively Moderate | 69.9 | $164,205 | about 3 a year | 564 |
| Drought | Relatively Low | 53.1 | $229,472 | about 84 a year | 2,345 |
| Volcanic activity | Very Low | 43.0 | $10 | rarer than once in 1,000 years | 2 |
| Heat wave | Very Low | 27.8 | $151,515 | about once every 3.3 years | 4 |
| Inland flooding | Very Low | 22.1 | $3.4 million | about once every 2.0 years | 14 |
| Ice storm | Very Low | 9.0 | $5,739 | about once every 67 years | 0 |
| Strong wind | Very Low | 7.3 | $66,405 | about once every 8.8 years | 5 |
| Tornado | Very Low | 5.2 | $27,724 | about once every 25 years | 0 |
| Cold wave | Very Low | 2.3 | — | rarer than once in 1,000 years | 0 |
| Hail | Very Low | 1.4 | $2,031 | about once every 13 years | 2.9 |
| Coastal flooding | Not Applicable | — | — | — | — |
| 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 7
Most common: Flood 4, Fire 1, Coastal Storm 1, Drought 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 1 | Drought |
| 1980s | 2 | Flood ×2 |
| 2000s | 2 | Coastal Storm, Flood |
| 2010s | 1 | Flood |
| 2020s | 1 | Fire |
The last 7
Widest declarations that included Sevier County
- Hurricane Katrina Evacuation (2005, EM-3223-UT): 29 Utah counties designated.
- Drought (1977, EM-3024-UT): 27 Utah counties designated.
- Severe Storms, Landslides & Flooding (1983, DR-680-UT): 22 Utah 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. Utah also had 2 statewide declarations with no county list.
Tornado record since 1950 2
| Tornadoes touching the county | 2 |
|---|---|
| Strongest-rated | (E)F1 ×2 |
| Peak month | April (1) |
| Deadliest | 19 Apr 1970, F1, 1.5 mi path, 0 killed, 1 injured |
| Longest path | 7 Aug 1957, F1, 1.5 mi path |
| Most recent | 19 Apr 1970, F1, 1.5 mi path, 0 killed, 1 injured |
| Deaths / injuries on those paths | 0 / 1 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
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 Sevier County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Sevier County (this page) | — | Very Low | 22.7 | Earthquake |
| Piute County | 54 km | Very Low | 0.9 | Landslide |
| Sanpete County | 72 km | Very Low | 38.6 | Avalanche |
| Wayne County | 91 km | Very Low | 1.9 | Landslide |
| Emery County | 100 km | Very Low | 7.0 | Lightning |
| Garfield County | 104 km | Very Low | 37.6 | Landslide |
Nearest by distance between county centres. Every county in Utah, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 13.8 |
|---|---|
| Community resilience | Relatively Moderate 56.1 |
| Community risk factor | 0.82 |
| Expected annual loss, all hazards | $10 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 Sevier County's main hazards
- Right now: National Weather Service alerts for Utah · all official warnings on Global Incident Tracker.
- Earthquake: Earthquakes today · Earthquake safety guide
- Avalanche: Official warnings now
- 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 Sevier County
What natural disasters is Sevier County, Utah most at risk from?
Sevier County, Utah has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 22.7 out of 100, higher than about 22% of US counties, with earthquakes, avalanches and landslides scoring highest of its 18 hazards and $10 million a year in expected losses.
How many federal disaster declarations has Sevier County had?
OpenFEMA lists 7 federal disaster declarations that included Sevier County since 1977, not counting 2 for COVID-19; the latest is FM-5600-UT (Monroe Canyon Fire, declared 16 July 2025). Another 2 Utah declarations were made statewide without a county list.
How many tornadoes have hit Sevier County?
NOAA's Storm Prediction Center recorded 2 tornadoes touching Sevier County from 1950 to 2025. The deadliest: 19 Apr 1970, F1, 1.5 mi path, 0 killed, 1 injured (deaths and injuries are for the whole path).
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.