Riverine Flood Risk in Maryland
All Maryland 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 24 of 24 Maryland counties in FEMA's National Risk Index. Prince George's County carries the state's highest riverine flood score at 94.6, with $65M in expected annual riverine flood losses.
4 Maryland counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $492M 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 | Prince George's County | High | 4.18 / yr | $65M | |
| 2 | Baltimore City | High | 1.89 / yr | $52M | |
| 3 | Baltimore County | High | 5.64 / yr | $67M | |
| 4 | Montgomery County | High | 5.46 / yr | $71M | |
| 5 | Frederick County | Medium | 4.68 / yr | $32M | |
| 6 | Anne Arundel County | Medium | 3.64 / yr | $33M | |
| 7 | Harford County | Medium | 2.89 / yr | $30M | |
| 8 | Howard County | Medium | 2.57 / yr | $30M | |
| 9 | Allegany County | Medium | 2.00 / yr | $11M | |
| 10 | Washington County | Medium | 2.11 / yr | $14M | |
| 11 | Carroll County | Low | 2.71 / yr | $18M | |
| 12 | Cecil County | Low | 2.50 / yr | $11M | |
| 13 | Charles County | Low | 1.68 / yr | $11M | |
| 14 | Worcester County | Low | 0.86 / yr | $6M | |
| 15 | Wicomico County | Low | 0.71 / yr | $6M | |
| 16 | St. Mary's County | Low | 2.57 / yr | $7M | |
| 17 | Garrett County | Very Low | 1.96 / yr | $4M | |
| 18 | Queen Anne's County | Very Low | 1.18 / yr | $4M | |
| 19 | Calvert County | Very Low | 1.14 / yr | $6M | |
| 20 | Talbot County | Very Low | 0.79 / yr | $3M | |
| 21 | Caroline County | Very Low | 0.82 / yr | $3M | |
| 22 | Somerset County | Very Low | 0.46 / yr | $2M | |
| 23 | Dorchester County | Very Low | 0.68 / yr | $2M | |
| 24 | Kent County | Very Low | 0.75 / yr | $2M |
24 Maryland counties with measurable riverine flood risk. See the national riverine flood ranking or all Maryland counties by overall risk.
Frequently Asked Questions
Which Maryland county has the highest riverine flood risk?
Prince George's County has the highest FEMA riverine flood risk score in Maryland at 94.6 (High), with $65M in expected annual losses and about 4.18 events per year.
How many Maryland counties face significant riverine flood risk?
24 Maryland counties record measurable riverine flood risk in FEMA's National Risk Index; 4 of them are rated High or Very High.