Mitchell County, IA Environment & Hazard Risk
Very Low natural hazard risk, led by strong wind. 416 storm events since 1996.
- Expected yearly loss
- $14.4M
- Very Low nationally
- Storm events since 1996
- 416
- Most often hail
- Flood insurance policies
- 9
- 0.2% of homes
- Hurricanes nearby
- 0
- Since 1851
Natural hazard risk
FEMA National Risk Index, December 2025
Overall risk
Very Low
Score 37.7 of 100
Social vulnerability
Very Low
Score 17.5 of 100
Community resilience
Very High
Score 85.9 of 100
Community resilience runs the other way: a higher rating means a community can recover faster.
Building value exposed: $3.2B · Agriculture value exposed: $407M · Risk-adjusted yearly loss: $12.3M
Risk by hazard
- Strong windRelatively High$4.6M/yr expected annual loss, about 3.8 events a year
- DroughtRelatively Moderate$2.1M/yr expected annual loss, about 22 events a year
- HailRelatively Low$420K/yr expected annual loss, about 4.5 events a year
- TornadoRelatively Low$1.4M/yr expected annual loss, about once every 3 years
- Winter weatherRelatively Low$70K/yr expected annual loss, about 19 events a year
- Cold waveRelatively Low$566K/yr expected annual loss, about 9.7 events a year
- LandslideVery Low$347/yr expected annual loss, about once every 20 years
- Ice stormVery Low$21.8K/yr expected annual loss, about once every 1 year
- Heat waveVery Low$51.3K/yr expected annual loss, about 3.8 events a year
- WildfireVery Low$4,769/yr expected annual loss, about once every 10,070 years
- LightningVery Low$44.5K/yr expected annual loss, about 40 events a year
- EarthquakeVery Low$5,661/yr expected annual loss, about once every 2,336 years
Bars show the national percentile score (0 to 100) for each hazard. Dollar figures are expected annual losses to buildings, people and crops. Not rated here: avalanche, coastal flooding, hurricane, riverine flooding, tsunami, volcanic activity.
Flood risk and insurance
National Flood Insurance Program and FEMA flood maps
Check the flood zone for an address
- Homes with flood insurance
- 9 of 5,264 (0.2%)
- Homes in high-risk flood zones
- 87
- Insured in high-risk zones
- 5 (6%)
- Flood claims since 1978
- 25
- Claims paid since 1978
- $467K
Flood claims paid per year
- June Midwest Flooding$172K · 3 claims
- Storm$70.4K · 4 claims
Storm history
Since 1996: 416 events, 0 deaths, $83.5M in damage
- Hail78
- Thunderstorm Wind74
- Winter Storm51
- Drought23
- Flash Flood23
- Blizzard21
- Flood21
- Extreme Cold/Wind Chill19
- High Wind17
- Heavy Snow15
Events per year
19 tornadoes on record (EF0 5, EF1 2, F0 4, F1 5, F2 3).
Most damaging storms
Since 1996, ranked by deaths, injuries and damage
- Thunderstorm Wind61 kt wind09/02/2011
Carpenter, Mitchell County
$41.4M damage
What happened
Widespread corn and bean fields were flattened across Mitchell County. The USDA estimated that 500 acres of corn were destroyed while 81,000 acres suffered a 60% yield loss. Almost 8,600 acres of beans suffered a 10% yield loss. Total crop losses were estimated to be in excess of $41 million. The U.S. Department of Agriculture issued a natural disaster designation for this damage.
- Flash Flood05/20/2013
Otranto, Mitchell County
$24.5M damage
What happened
Heavy rain produced wide spread flash flooding across much of Mitchell County. Numerous roads around Stacyville were under water by early evening and sand bagging occurred along the Little Cedar River. U.S. Highway 218 was closed by flooding between Osage and St. Ansgar and State Highway 9 was closed east and west of Osage. West of Osage, two culverts were washed away, causing a section of Highway 9 to collapse. A total of 22 roads were closed, 6 to 8 bridges washed out and approximately 90 percent of the gravel roads across the entire county were covered with water. Damage to the roads was estimated to be around $4.5 million. In addition to all the road damage, a railroad bridge north of St. Ansgar was also washed out. The Stacyville fire department reported between 6 and 7 inches of rain had fallen during the mid and late afternoon hours. The heavy rains also took out about 15 percent of the county's corn crop.
- Flash Flood08/28/2021
Otranto, Mitchell County
$3.5M damage
What happened
Runoff from heavy rains pushed the Little Cedar River out of its banks. County roads A46 and T64 near New Haven had to be closed because of the flood waters. Spring Creek also went out if its banks causing U.S. Highway 18 to be closed near Osage. A dam on the Cedar River near Mitchell sustained damage from the flood waters. Numerous gravel roads across the county suffered washouts.
- Flood06/08/2008
Meyer, Mitchell County
$2.7M damage
What happened
Highway 218 was closed due to flooding and Highway 9 east of Osage was closed since water topped the bridge. Widespread overland flooding continued across the county, which was described as a lake on Sunday June 8. In addition, the Cedar River was in flood for several days, cresting in Charles City, Iowa during the morning of June 9th.||In Stacyville the flooding was the worst in years and left water standing in fields for more than a week. Besides crop damage, many basements were flooded.
- Flash Flood06/08/2008
Mona, Mitchell County
$2.5M damage
What happened
Flash flooding closed several secondary roads in the county with numerous bridges and culverts washed out.
- Thunderstorm Wind61 kt wind04/07/2001
Osage, Mitchell County
$1M damage
What happened
Wind gusts estimated at 65 to 70 mph caused damage to several farms, knocking down sheds and outbuildings. Ten cattle were killed when a large shed collapsed on them. A 660 foot chicken house, containing 45,000 chickens, was completely destroyed, injuring and killing many of the animals.
Drinking water
5 community water systems serve about 6,147 people. Violations since 2021.
None of the systems serving this county had a health-based violation in this period.
- Osage Municipal Water SupplyServes 3,637 · Groundwater · Local governmentNo health violations
- St Ansgar Water SupplyServes 1,161 · Groundwater · Local governmentNo health violations+1 monitoring or reporting
- Riceville Water SupplyServes 816 · Groundwater · Local governmentNo health violations+2 monitoring or reporting
- Stacyville Water SupplyServes 465 · Groundwater · Local governmentNo health violations
- Orchard Water WorksServes 68 · Groundwater · Local governmentNo health violations+1 monitoring or reporting
Largest systems by population served. Monitoring and reporting violations mean required tests or notices were late or missing, not that the water was unsafe.
Pollution sites
0 Superfund sites and 4 toxic release facilities in Mitchell County
Superfund sites
None in this county.
Toxic release facilities
- Valent Biosciences LLC26,250 lbs released, Osage
- Absolute Energy LLC16,476 lbs released, Saint Ansgar
- Wold Rim & Wheel0 lbs released, Saint Ansgar
- A To Z Drying Inc0 lbs released, Osage
Total: 42,726 lbs in 2024, 35,566 lbs to air.
Superfund sitesToxic release facilitiesEPA inspections and enforcementAir toxics cancer risk8 historic places
Frequently asked questions
- How risky is Mitchell County for natural disasters?
- FEMA rates Mitchell County very low for overall natural hazard risk, with expected losses of $14.4M a year. The highest-rated hazards are strong wind (relatively high), drought (relatively moderate), hail (relatively low).
- What storms are most common in Mitchell County?
- Since 1996, NOAA recorded 416 storm events affecting Mitchell County, most often hail (78), thunderstorm wind (74), winter storm (51).
- How many tornadoes have hit Mitchell County?
- 19 tornadoes have been recorded in Mitchell County since 1950.
- How many homes in Mitchell County have flood insurance?
- 9 residential flood insurance policies are in force in Mitchell County, covering about 0.2% of homes. The program has paid $467K on 25 claims here since 1978.
- What is the weather like in Mitchell County?
- At Osage, average highs reach 81°F in Jul and lows fall to 6°F in Jan, with 37.6 inches of rain a year (1991-2020 normals).
Source: FEMA (National Risk Index, NFIP), NOAA (Storm Events, HURDAT2, Climate Normals), EPA · Last updated 08/01/2026 · Storm counts include events in forecast zones that touch the county. This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.