Lewis and Clark, MT
Lewis and Clark County in Montana has 4 FEMA disaster declarations on record covering 1975–2018, most recently Flooding on Oct 31, 2018 (DR-4405). Its flood risk grade is A (Low risk), ranking #2198 of 3,277 U.S. counties, with 7 NFIP flood insurance claims totaling $19,701 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Lewis and Clark County
The 4 most recent federally declared disasters affecting Lewis and Clark County, MT (1975–2018). Total declarations on record: 4.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Oct 31, 2018 | Flood | Flooding | DR-4405 |
| Sep 13, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3253 |
| May 27, 1981 | Flood | Severe Storms & Flooding | DR-640 |
| Jun 28, 1975 | Flood | Rains, Showmelt, Storms & Flooding | DR-472 |
Score Breakdown
The composite score of 10 is calculated from four weighted factors. See our methodology for details.
Other Counties in Montana
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Carbon | A | 10 | 1 | 5 |
| Daniels | A | 10 | 0 | 5 |
| Fergus | A | 10 | 0 | 5 |
| Garfield | A | 10 | 0 | 4 |
| Golden Valley | A | 10 | 0 | 4 |
| Musselshell | A | 10 | 0 | 5 |
More Counties in Montana
Frequently Asked Questions
How many FEMA disaster declarations does Lewis and Clark County, MT have?
Lewis and Clark County, MT has 4 federal disaster declarations on FEMA record (1975–2018). The 4 most recent are: Flooding (declared Oct 31, 2018, DR-4405); Hurricane Katrina Evacuation (declared Sep 13, 2005, DR-3253); Severe Storms & Flooding (declared May 27, 1981, DR-640); Rains, Showmelt, Storms & Flooding (declared Jun 28, 1975, DR-472). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for Lewis and Clark County, MT?
Lewis and Clark County is graded A (composite score 10/100, low risk). It ranks #2198 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 Lewis and Clark County?
7 NFIP flood insurance claims have been filed in Lewis and Clark County, MT, totaling $19,701 in payouts. The average claim is $2,814. Source: FEMA FimaNfipClaims v2 dataset.
Has Lewis and Clark County, MT had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Lewis and Clark County was Flooding on Oct 31, 2018 (DR-4405). The county has 4 declared disasters in the OpenFEMA record covering 1975–2018.
The this entity record above pulls directly from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims. What follows is the per-entity context — how this entity sits in the broader U.S. flood risk, NFIP claims, and disaster declarations distribution and which underlying factors drive the headline numbers.
Every number on this page links back to FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. ZIPs, counties, and states with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: FEMA OpenFEMA datasets, 2026.