Colorado inland flooding risk
Denver County has the highest inland flooding risk in Colorado, scoring 95.3 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Colorado have increased 59% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Denver County | 95.3 | Relatively High | 8 |
| 2 | El Paso County | 95 | Relatively High | 78 |
| 3 | Jefferson County | 93.4 | Relatively High | 4 |
| 4 | Arapahoe County | 92.5 | Relatively Moderate | 7 |
| 5 | Boulder County | 92.2 | Relatively Moderate | 3 |
| 6 | Larimer County | 89.4 | Relatively Moderate | 29 |
| 7 | Weld County | 88.5 | Relatively Moderate | 19 |
| 8 | Adams County | 87.2 | Relatively Moderate | 5 |
| 9 | Douglas County | 86.9 | Relatively Moderate | 2 |
| 10 | Eagle County | 86.5 | Relatively Moderate | 10 |
| 11 | Mesa County | 81.9 | Relatively Moderate | 35 |
| 12 | La Plata County | 81.4 | Relatively Moderate | 12 |
| 13 | Pueblo County | 81.1 | Relatively Moderate | 70 |
| 14 | Fremont County | 80.2 | Relatively Moderate | 32 |
| 15 | Garfield County | 77.5 | Relatively Moderate | 14 |
| 16 | Delta County | 69.6 | Relatively Low | 7 |
| 17 | Montrose County | 67.4 | Relatively Low | 16 |
| 18 | Summit County | 65.4 | Relatively Low | 0 |
| 19 | Chaffee County | 64.7 | Relatively Low | 12 |
| 20 | Grand County | 62.4 | Relatively Low | 14 |
| 21 | Otero County | 60.1 | Relatively Low | 19 |
| 22 | Pitkin County | 58.2 | Relatively Low | 9 |
| 23 | Routt County | 57.5 | Relatively Low | 7 |
| 24 | Gunnison County | 57 | Relatively Low | 8 |
| 25 | Montezuma County | 56.1 | Relatively Low | 8 |
| 26 | Morgan County | 55.8 | Relatively Low | 5 |
| 27 | Rio Grande County | 54.9 | Relatively Low | 0 |
| 28 | Archuleta County | 51.7 | Relatively Low | 8 |
| 29 | Rio Blanco County | 51 | Relatively Low | 4 |
| 30 | Prowers County | 49.5 | Relatively Low | 7 |
| 31 | Huerfano County | 47.9 | Relatively Low | 53 |
| 32 | Logan County | 46.6 | Relatively Low | 5 |
| 33 | Alamosa County | 43.7 | Relatively Low | 0 |
| 34 | Clear Creek County | 40 | Relatively Low | 0 |
| 35 | Las Animas County | 36.3 | Relatively Low | 4 |
| 36 | Conejos County | 33.7 | Very Low | 0 |
| 37 | Broomfield County | 33.1 | Very Low | 1 |
| 38 | San Miguel County | 31.6 | Very Low | 5 |
| 39 | Moffat County | 30.7 | Very Low | 6 |
| 40 | Elbert County | 29.9 | Very Low | 5 |
| 41 | Ouray County | 24.7 | Very Low | 3 |
| 42 | Park County | 21.8 | Very Low | 2 |
| 43 | Kit Carson County | 20.3 | Very Low | 23 |
| 44 | Saguache County | 17.5 | Very Low | 4 |
| 45 | Costilla County | 17.2 | Very Low | 8 |
| 46 | Teller County | 15.9 | Very Low | 4 |
| 47 | Washington County | 15.6 | Very Low | 3 |
| 48 | Lincoln County | 14.8 | Very Low | 5 |
| 49 | Yuma County | 12.9 | Very Low | 13 |
| 50 | Gilpin County | 11.6 | Very Low | 0 |
| 51 | Custer County | 9.5 | Very Low | 14 |
| 52 | Dolores County | 8.8 | Very Low | 5 |
| 53 | Lake County | 8.7 | Very Low | 0 |
| 54 | Phillips County | 8.3 | Very Low | 2 |
| 55 | Bent County | 7.6 | Very Low | 4 |
| 56 | Mineral County | 7.5 | Very Low | 1 |
| 57 | Hinsdale County | 7.3 | Very Low | 2 |
| 58 | Baca County | 6.4 | Very Low | 2 |
| 59 | Crowley County | 6.4 | Very Low | 1 |
| 60 | Jackson County | 5.8 | Very Low | 0 |
| 61 | Kiowa County | 4.8 | Very Low | 3 |
| 62 | Cheyenne County | 4 | Very Low | 12 |
| 63 | San Juan County | 4 | Very Low | 0 |
| 64 | Sedgwick County | 3.9 | Very Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Inland Flooding risk nationally:
Other hazard risks in Colorado:
Frequently asked questions
What is the highest inland flooding risk county in Colorado?
Denver County, CO has the highest inland flooding risk in Colorado, with a FEMA National Risk Index score of 95.3 out of 100 (rated "Relatively High").
What causes inland flooding risk in Colorado?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.