Natural disaster risk in Lewis County, Missouri
Missouri · population 10,016 · FIPS 29111
Overall: very low risk
Lewis County has a composite risk score of 27.4 out of 100 — higher than 27% of US counties. It ranks 90 of 115 in Missouri (1 = highest risk). Its highest-rated hazards are heat wave, strong wind, landslide.
Drought now: No: no drought or dryness
No. On the U.S. Drought Monitor map valid 13 October 2026, no part of Lewis County is in drought or abnormally dry (none of D0 to D4). That has been so for 5 weeks in a row.
Drought in Lewis County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Very low 27.4 |
| Expected annual loss About $8.1 million a year, on average, across all 18 hazards. |
Very low 26.7 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Relatively moderate 52.4 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Relatively low 21.5 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Lewis County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Heat wave | Relatively moderate 82 |
| Strong wind | Relatively moderate 58 |
| Landslide | Relatively low 64 |
| Drought | Relatively low 62 |
| Hail | Relatively low 59 |
| Lightning | Relatively low 41 |
| Inland (riverine) flooding | Relatively low 37 |
| Cold wave | Relatively low 36 |
| Tornado | Relatively low 32 |
| Earthquake | Very low 38 |
| Wildfire | Very low 36 |
| Ice storm | Very low 20 |
| Winter weather | Very low 20 |
| Hurricane | Very low 12 |
| Avalanche | Not applicable |
| Coastal flooding | Not applicable |
| Tsunami | Not applicable |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Lewis County
Federal declarations that designated Lewis County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Lewis County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is DR-4929-MO (Severe Storms, Straight-Line Winds, Tornadoes, and Flooding), declared 3 Aug 2026.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| DR-4929-MO | Major disaster | Severe Storms, Straight-Line Winds, Tornadoes, and Flooding | 3 Aug 2026 | No |
All FEMA declarations in Missouri, with estimated apply-by dates · Open FEMA deadlines
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). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Lewis County, Missouri?
FEMA's National Risk Index rates the overall risk in Lewis County as very low, with a score of 27.4 out of 100 (higher than 27% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Lewis County?
The hazards rated highest for Lewis County are heat wave (relatively moderate), strong wind (relatively moderate), landslide (relatively low).
What is the flood risk in Lewis County?
FEMA rates inland (river and rain) flooding risk in Lewis County as relatively low. For a specific property, check the FEMA flood map and your local floodplain office.
Has Lewis County had a FEMA disaster declaration?
Yes. Lewis County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is DR-4929-MO (Severe Storms, Straight-Line Winds, Tornadoes, and Flooding), declared 3 Aug 2026.
Is Lewis County in a drought?
No. On the U.S. Drought Monitor map valid 13 October 2026, no part of Lewis County is in drought or abnormally dry (none of D0 to D4). That has been so for 5 weeks in a row.
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