Riverine Flood Risk in Utah
All Utah 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 29 of 29 Utah counties in FEMA's National Risk Index. Washington County carries the state's highest riverine flood score at 93.4, with $66M in expected annual riverine flood losses.
1 Utah county is rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $329M 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 | Washington County | High | 6.68 / yr | $66M | |
| 2 | Salt Lake County | Medium | 1.14 / yr | $79M | |
| 3 | Utah County | Medium | 1.11 / yr | $64M | |
| 4 | Weber County | Low | 0.61 / yr | $19M | |
| 5 | Davis County | Low | 0.39 / yr | $16M | |
| 6 | Kane County | Low | 4.89 / yr | $9M | |
| 7 | Summit County | Low | 0.21 / yr | $12M | |
| 8 | Garfield County | Low | 3.61 / yr | $6M | |
| 9 | Cache County | Low | 0.54 / yr | $9M | |
| 10 | Iron County | Low | 1.61 / yr | $8M | |
| 11 | Wasatch County | Very Low | 0.04 / yr | $6M | |
| 12 | Grand County | Very Low | 2.54 / yr | $3M | |
| 13 | Sanpete County | Very Low | 0.46 / yr | $3M | |
| 14 | San Juan County | Very Low | 1.86 / yr | $2M | |
| 15 | Carbon County | Very Low | 0.61 / yr | $3M | |
| 16 | Sevier County | Very Low | 0.50 / yr | $3M | |
| 17 | Box Elder County | Very Low | 0.14 / yr | $4M | |
| 18 | Tooele County | Very Low | 0.61 / yr | $4M | |
| 19 | Millard County | Very Low | 0.32 / yr | $2M | |
| 20 | Duchesne County | Very Low | 0.68 / yr | $3M | |
| 21 | Emery County | Very Low | 1.29 / yr | $2M | |
| 22 | Morgan County | Very Low | 0.21 / yr | $3M | |
| 23 | Uintah County | Very Low | 0.64 / yr | $2M | |
| 24 | Beaver County | Very Low | 0.14 / yr | $1M | |
| 25 | Wayne County | Very Low | 4.86 / yr | $903K | |
| 26 | Juab County | Very Low | 0.07 / yr | $1M | |
| 27 | Piute County | Very Low | 0.39 / yr | $576K | |
| 28 | Rich County | Very Low | 0.11 / yr | $696K | |
| 29 | Daggett County | Very Low | 0.39 / yr | $192K |
29 Utah counties with measurable riverine flood risk. See the national riverine flood ranking or all Utah counties by overall risk.
Frequently Asked Questions
Which Utah county has the highest riverine flood risk?
Washington County has the highest FEMA riverine flood risk score in Utah at 93.4 (High), with $66M in expected annual losses and about 6.68 events per year.
How many Utah counties face significant riverine flood risk?
29 Utah counties record measurable riverine flood risk in FEMA's National Risk Index; 1 of them are rated High or Very High.