Riverine Flood Risk in Oregon
All Oregon 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 36 of 36 Oregon counties in FEMA's National Risk Index. Lane County carries the state's highest riverine flood score at 97.2, with $117M in expected annual riverine flood losses.
5 Oregon counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $852M 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 | Lane County | High | 0.86 / yr | $117M | |
| 2 | Multnomah County | High | 0.39 / yr | $91M | |
| 3 | Douglas County | High | 1.29 / yr | $56M | |
| 4 | Washington County | High | 0.75 / yr | $81M | |
| 5 | Clackamas County | High | 0.93 / yr | $77M | |
| 6 | Jackson County | Medium | 0.57 / yr | $54M | |
| 7 | Marion County | Medium | 0.71 / yr | $37M | |
| 8 | Josephine County | Medium | 0.64 / yr | $32M | |
| 9 | Deschutes County | Medium | 0.50 / yr | $42M | |
| 10 | Lincoln County | Medium | 0.61 / yr | $20M | |
| 11 | Linn County | Medium | 0.25 / yr | $28M | |
| 12 | Coos County | Medium | 2.25 / yr | $22M | |
| 13 | Umatilla County | Medium | 0.64 / yr | $18M | |
| 14 | Klamath County | Medium | 0.39 / yr | $15M | |
| 15 | Tillamook County | Medium | 1.32 / yr | $15M | |
| 16 | Benton County | Medium | 0.79 / yr | $19M | |
| 17 | Yamhill County | Medium | 0.21 / yr | $18M | |
| 18 | Clatsop County | Low | 0.21 / yr | $12M | |
| 19 | Polk County | Low | 0.82 / yr | $15M | |
| 20 | Columbia County | Low | 0.43 / yr | $14M | |
| 21 | Curry County | Low | 1.46 / yr | $7M | |
| 22 | Wasco County | Low | 0.11 / yr | $9M | |
| 23 | Malheur County | Low | 0.79 / yr | $7M | |
| 24 | Grant County | Low | 0.36 / yr | $5M | |
| 25 | Wallowa County | Low | 0.61 / yr | $5M | |
| 26 | Baker County | Low | 0.46 / yr | $5M | |
| 27 | Crook County | Low | 0.25 / yr | $4M | |
| 28 | Morrow County | Low | 0.29 / yr | $5M | |
| 29 | Lake County | Low | 0.18 / yr | $4M | |
| 30 | Union County | Low | 0.39 / yr | $4M | |
| 31 | Jefferson County | Low | 0.04 / yr | $5M | |
| 32 | Hood River County | Very Low | 0.14 / yr | $5M | |
| 33 | Harney County | Very Low | 0.32 / yr | $3M | |
| 34 | Wheeler County | Very Low | 0.46 / yr | $1M | |
| 35 | Gilliam County | Very Low | 0.07 / yr | $791K | |
| 36 | Sherman County | Very Low | 0.04 / yr | $694K |
36 Oregon counties with measurable riverine flood risk. See the national riverine flood ranking or all Oregon counties by overall risk.
Frequently Asked Questions
Which Oregon county has the highest riverine flood risk?
Lane County has the highest FEMA riverine flood risk score in Oregon at 97.2 (High), with $117M in expected annual losses and about 0.86 events per year.
How many Oregon counties face significant riverine flood risk?
36 Oregon counties record measurable riverine flood risk in FEMA's National Risk Index; 5 of them are rated High or Very High.