Riverine Flood Risk in Colorado
All Colorado counties ranked by FEMA National Risk Index riverine flood score
Riverine Flood risk — rivers and streams overflowing their banks after heavy rain or snowmelt — is rated for 64 of 64 Colorado counties in FEMA's National Risk Index. Denver County carries the state's highest riverine flood score at 95.3, with $94M in expected annual riverine flood losses.
3 Colorado counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $960M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Riverine Flood
| # | County | Riverine Flood Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Denver County | High | 0.82 / yr | $94M | |
| 2 | El Paso County | High | 4.11 / yr | $105M | |
| 3 | Jefferson County | High | 1.29 / yr | $77M | |
| 4 | Arapahoe County | Medium | 1.32 / yr | $62M | |
| 5 | Boulder County | Medium | 0.75 / yr | $69M | |
| 6 | Larimer County | Medium | 2.07 / yr | $54M | |
| 7 | Weld County | Medium | 1.89 / yr | $44M | |
| 8 | Adams County | Medium | 0.64 / yr | $39M | |
| 9 | Douglas County | Medium | 1.36 / yr | $44M | |
| 10 | Eagle County | Medium | 1.14 / yr | $39M | |
| 11 | Mesa County | Medium | 2.57 / yr | $22M | |
| 12 | La Plata County | Medium | 1.89 / yr | $24M | |
| 13 | Pueblo County | Medium | 2.64 / yr | $21M | |
| 14 | Fremont County | Medium | 1.64 / yr | $16M | |
| 15 | Garfield County | Medium | 1.68 / yr | $21M | |
| 16 | Delta County | Low | 0.61 / yr | $11M | |
| 17 | Montrose County | Low | 1.21 / yr | $12M | |
| 18 | Summit County | Low | 0.04 / yr | $15M | |
| 19 | Chaffee County | Low | 0.64 / yr | $13M | |
| 20 | Grand County | Low | 0.46 / yr | $12M | |
| 21 | Otero County | Low | 1.04 / yr | $7M | |
| 22 | Pitkin County | Low | 0.96 / yr | $13M | |
| 23 | Routt County | Low | 0.79 / yr | $13M | |
| 24 | Gunnison County | Low | 0.57 / yr | $12M | |
| 25 | Montezuma County | Low | 0.61 / yr | $7M | |
| 26 | Morgan County | Low | 1.18 / yr | $9M | |
| 27 | Rio Grande County | Low | 0.14 / yr | $5M | |
| 28 | Archuleta County | Low | 0.36 / yr | $5M | |
| 29 | Rio Blanco County | Low | 1.11 / yr | $6M | |
| 30 | Prowers County | Low | 1.04 / yr | $4M | |
| 31 | Huerfano County | Low | 1.50 / yr | $4M | |
| 32 | Logan County | Low | 0.71 / yr | $5M | |
| 33 | Alamosa County | Low | 0.07 / yr | $3M | |
| 34 | Clear Creek County | Low | 0.25 / yr | $7M | |
| 35 | Las Animas County | Low | 0.57 / yr | $4M | |
| 36 | Conejos County | Very Low | 0.07 / yr | $3M | |
| 37 | Broomfield County | Very Low | 0.07 / yr | $6M | |
| 38 | San Miguel County | Very Low | 1.21 / yr | $5M | |
| 39 | Moffat County | Very Low | 0.57 / yr | $5M | |
| 40 | Elbert County | Very Low | 0.82 / yr | $5M | |
| 41 | Ouray County | Very Low | 0.79 / yr | $4M | |
| 42 | Park County | Very Low | 0.36 / yr | $4M | |
| 43 | Kit Carson County | Very Low | 1.36 / yr | $2M | |
| 44 | Saguache County | Very Low | 0.25 / yr | $2M | |
| 45 | Costilla County | Very Low | 0.43 / yr | $1M | |
| 46 | Teller County | Very Low | 0.86 / yr | $3M | |
| 47 | Washington County | Very Low | 0.93 / yr | $2M | |
| 48 | Lincoln County | Very Low | 0.61 / yr | $2M | |
| 49 | Yuma County | Very Low | 1.21 / yr | $2M | |
| 50 | Gilpin County | Very Low | 0.07 / yr | $2M | |
| 51 | Custer County | Very Low | 0.79 / yr | $2M | |
| 52 | Dolores County | Very Low | 0.29 / yr | $1M | |
| 53 | Lake County | Very Low | 0.01 / yr | $2M | |
| 54 | Phillips County | Very Low | 0.43 / yr | $1M | |
| 55 | Bent County | Very Low | 0.54 / yr | $1M | |
| 56 | Mineral County | Very Low | 0.07 / yr | $1M | |
| 57 | Hinsdale County | Very Low | 0.25 / yr | $1M | |
| 58 | Baca County | Very Low | 0.36 / yr | $546K | |
| 59 | Crowley County | Very Low | 0.18 / yr | $759K | |
| 60 | Jackson County | Very Low | 0.04 / yr | $790K | |
| 61 | Kiowa County | Very Low | 0.32 / yr | $844K | |
| 62 | San Juan County | Very Low | 0.18 / yr | $860K | |
| 63 | Cheyenne County | Very Low | 0.89 / yr | $723K | |
| 64 | Sedgwick County | Very Low | 0.29 / yr | $626K |
64 Colorado counties with measurable riverine flood risk. See the national riverine flood ranking or all Colorado counties by overall risk.
Frequently Asked Questions
Which Colorado county has the highest riverine flood risk?
Denver County has the highest FEMA riverine flood risk score in Colorado at 95.3 (High), with $94M in expected annual losses and about 0.82 events per year.
How many Colorado counties face significant riverine flood risk?
64 Colorado counties record measurable riverine flood risk in FEMA's National Risk Index; 3 of them are rated High or Very High.