Corson, SD
Corson County in South Dakota has 3 FEMA disaster declarations on record covering 1997–2014, most recently Severe Storms, Tornadoes, and Flooding on Jul 28, 2014 (DR-4186). Its flood risk grade is A (Low risk), ranking #2516 of 3,277 U.S. counties, with 0 NFIP flood insurance claims totaling $0 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Corson County
The 3 most recent federally declared disasters affecting Corson County, SD (1997–2014). Total declarations on record: 3.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Jul 28, 2014 | Flood | Severe Storms, Tornadoes, and Flooding | DR-4186 |
| Sep 10, 2005 | Coastal Storm | Hurricane Katrina Evacuation | DR-3234 |
| Apr 7, 1997 | Flood | Severe Flooding, Sever Winter Storms,heavy Rains High Winds | DR-1173 |
Score Breakdown
The composite score of 9 is calculated from four weighted factors. See our methodology for details.
Other Counties in South Dakota
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Oglala Lakota | A | 9 | 0 | 3 |
| Harding | A | 9 | 0 | 3 |
| Dewey | A | 10 | 0 | 4 |
| Perkins | A | 10 | 0 | 5 |
| Ziebach | A | 10 | 0 | 5 |
| Bennett | A | 10 | 0 | 5 |
More Counties in South Dakota
Frequently Asked Questions
How many FEMA disaster declarations does Corson County, SD have?
Corson County, SD has 3 federal disaster declarations on FEMA record (1997–2014). The 3 most recent are: Severe Storms, Tornadoes, and Flooding (declared Jul 28, 2014, DR-4186); Hurricane Katrina Evacuation (declared Sep 10, 2005, DR-3234); Severe Flooding, Sever Winter Storms,heavy Rains High Winds (declared Apr 7, 1997, DR-1173). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for Corson County, SD?
Corson County is graded A (composite score 9/100, low risk). It ranks #2516 of 3,277 U.S. counties for flood risk in our scoring model. The grade combines NFIP claims density (40%), disaster frequency (25%), claim severity (20%), and year-over-year trend (15%).
How many NFIP flood insurance claims have been filed in Corson County?
0 NFIP flood insurance claims have been filed in Corson County, SD, totaling $0 in payouts. The average claim is $0. Source: FEMA FimaNfipClaims v2 dataset.
Has Corson County, SD had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Corson County was Severe Storms, Tornadoes, and Flooding on Jul 28, 2014 (DR-4186). The county has 3 declared disasters in the OpenFEMA record covering 1997–2014.
For this entity, the underlying data on this page comes from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
The methodology behind every numeric value on this page is publicly documented on the FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. ZIPs, counties, and states. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: FEMA OpenFEMA datasets, 2026.