Flood events in Story County, Iowa The flood events on record, by date and by year
This page is a county record of past events and claims. It does not show the flood zone or the risk of an address. For the flood map of an address, use FEMA's address search (opens in a new tab).
NCEI has 142 flood events on record for Story County, Iowa, from 1996 through 30 Jun 2026.
The newest flood event on record is on 21 May 2024.
From 2016 through 2025, NCEI has 40 flood events on record for the county.
The NWS collects event reports from a variety of sources, which include (but are not limited to): county, state, and federal emergency management officials, local law enforcement officials, SKYWARN spotters, NWS damage surveys, newspaper clipping services, the insurance industry, and the general public, among others.
The National Weather Service reports property and crop damage estimates using available data at the time of event reporting. These values should therefore be considered broad estimates. Damage amounts are not adjusted for inflation.
Zone (NWS Forecast Zone): A zone is a geographic area defined by the NWS for issuing forecasts, watches, and warnings. While zones often align with counties, they can also represent smaller or subdivided areas within a county to account for differences in weather conditions, such as elevation or proximity to water. Larger-scale events—such as heat, cold, drought, and winter storms—are typically recorded by zone.
The words of the agency. Source: NOAA NCEI, Storm Events Database, page "Frequently Asked Questions", copied on .
Date of the data: NCEI storm events through . Event types on this page: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
Newest flood events on record
Flood
2 miles WNW of COLLINS
Flood
1 mile N of AMES ARPT
Flash Flood
1 mile S of SLATER
Flash Flood
1 mile NNE of HUXLEY
Flash Flood
1 mile NNE of MAXWELL
Flash Flood
2 miles SW of IOWA CENTER
Flood
At ONTARIO. Damage estimate: $10 thousand
Flash Flood
1 mile S of ONTARIO
Flood
2 miles E of AMES ARPT
Flash Flood
2 miles ESE of AMES
Flash Flood
At AMES
Flood
4 miles N of COLO. Damage estimate: $5 thousand
Flood
2 miles S of NEVADA MUNI ARPT
Flood
1 mile ESE of AMES. Damage estimate: $10 thousand
Flood
4 miles N of COLO
Flood
1 mile NW of ONTARIO
Flood
3 miles W of STORY CITY. Damage estimate: $200 thousand
Flood
3 miles N of ONTARIO
Flood
2 miles SE of GILBERT
Flood
1 mile N of AMES ARPT
Flood
1 mile SW of NEVADA MUNI ARPT. Damage estimate: $100 thousand
Flash Flood
1 mile E of COLO
Flash Flood
2 miles ESE of COLO
Flood
2 miles S of KELLEY. Damage estimate: $200 thousand
Flash Flood
2 miles S of KELLEY
A place is the text of the NCEI record: a distance and a direction from a reference place. The site does not show a place text that names a private property or reads as a person. NCEI gives no magnitude for this hazard.
Flood events by year
| Decade | Year that ends in 0 | Year that ends in 1 | Year that ends in 2 | Year that ends in 3 | Year that ends in 4 | Year that ends in 5 | Year that ends in 6 | Year that ends in 7 | Year that ends in 8 | Year that ends in 9 | All |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1960s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1970s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1980s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1990s | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 2 | 6 | 5 | 17 |
| 2000s | 3 | 6 | 0 | 2 | 4 | 2 | 1 | 3 | 21 | 1 | 43 |
| 2010s | 20 | 0 | 0 | 9 | 3 | 10 | 8 | 0 | 12 | 14 | 76 |
| 2020s | 0 | 2 | 3 | 0 | 1 | 0 | 0 (part of the year) | 6 |
A darker cell has a larger count. The number is in each cell.
Flood and flash flood events are on record from 1996. The year 2026 has the events through 30 Jun 2026 only.
By month, all years
- Jan0 events
- Feb2 events
- Mar11 events
- Apr7 events
- May34 events
- Jun40 events
- Jul13 events
- Aug22 events
- Sep10 events
- Oct0 events
- Nov0 events
- Dec3 events
Beside the other counties
| Measure | Story | All counties of Iowa | All counties of the United States |
|---|---|---|---|
| Flood events, 1996 to 2026 | 142 | 7,383 | 177,902 |
| Events for each 100 square miles | 24.8 | 13.2 | 5.0 |
| Events for each 10,000 residents | 14.3 | 23.1 | 5.4 |
The columns for the state and the United States total the counties. They count the events of each county in the same way as the county column. A forecast zone with another name than a county counts for the state only.
More flood events on record
| Date | Event type | Magnitude | Damage estimate | Deaths | Injuries | On record for |
|---|---|---|---|---|---|---|
| Flash Flood | not recorded | $35 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $75 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $170 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $150 thousand | 0 | 0 | County | |
| Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $30 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $350 thousand | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 million | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $500 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flood | not recorded | $550 thousand | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $5 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $75 thousand | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flood | not recorded | $1.0 million | 0 | 0 | County | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $550 thousand | 0 | 0 | County | |
| Flood | not recorded | $20 million | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flood | not recorded | $5 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flood | not recorded | $350 thousand | 0 | 0 | County | |
| Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $1 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $60 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $25 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $275 thousand | 0 | 0 | County | |
| Flood | not recorded | $300 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $55 thousand | 0 | 0 | County | |
| Flood | not recorded | $40 thousand | 0 | 0 | County | |
| Flood | not recorded | $65 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flood | not recorded | $500 thousand | 0 | 0 | County | |
| Flood | not recorded | $100 thousand | 0 | 0 | County | |
| Flood | not recorded | $50 thousand | 0 | 0 | County | |
| Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flood | not recorded | $40 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $124 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $10 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | $55 thousand | 0 | 0 | County | |
| Flood | not recorded | $398 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $300 thousand | 0 | 0 | County | |
| Flood | not recorded | $5 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $5 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $260 thousand | 0 | 0 | County | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $150 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $8 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $5 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $70 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $50 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $125 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $60 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $225 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $10 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $7 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $60 thousand | 0 | 0 | County | |
| Flood | not recorded | $75 thousand | 0 | 0 | County | |
| Flood | not recorded | $120 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $265 thousand | 0 | 0 | County | |
| Flood | not recorded | $120 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $175 thousand | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | $1.5 million | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $1.6 million | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone |
The table has all other events on record. A damage figure is an estimate in the NCEI record.
Official channels
- NCEI Storm Events Database (opens in a new tab)Search the full NCEI record by state, county and date.
- National Weather Service: Des Moines, IA (opens in a new tab)The forecast office that issues the weather warnings for the county.
- FEMA Flood Map Service Center: Search By Address (opens in a new tab)Search an address to see its flood map. This site has no flood-zone data.
These links open the pages of the agencies. The site checked the links on .
Cite this page
County Hazards. "Flood events on record for Story County, Iowa". https://countyhazards.com/county/ia/story/flood/. Data: NOAA NCEI Storm Events Database through 30 Jun 2026. Page made on .
Questions
- Which month has the most flood events on record for Story County?
- June has 40 of the 142 flood events on record from 1996 through 30 Jun 2026.
- How many flood events are on record for Iowa?
- NCEI has 7,383 flood events on record for Iowa from 1996 through 30 Jun 2026. That count has every forecast zone of the state.
- How does Story County compare with the other counties of Iowa?
- The counties of Iowa have 13.2 flood events for each 100 square miles. Story County has 24.8.
- Why are some flood events on record for a forecast zone?
- NCEI records some event types for a National Weather Service forecast zone and not for a county. This page counts a zone event when the zone has the name of the county.