Riverine Flood Risk in New Jersey
All New Jersey 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 21 of 21 New Jersey counties in FEMA's National Risk Index. Middlesex County carries the state's highest riverine flood score at 98.9, with $197M in expected annual riverine flood losses.
13 New Jersey counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $1.99B 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 | Middlesex County | High | 3.18 / yr | $197M | |
| 2 | Bergen County | High | 5.93 / yr | $217M | |
| 3 | Essex County | High | 3.07 / yr | $149M | |
| 4 | Hudson County | High | 3.04 / yr | $128M | |
| 5 | Passaic County | High | 3.50 / yr | $111M | |
| 6 | Union County | High | 3.43 / yr | $117M | |
| 7 | Mercer County | High | 3.64 / yr | $114M | |
| 8 | Ocean County | High | 3.43 / yr | $100M | |
| 9 | Burlington County | High | 3.18 / yr | $122M | |
| 10 | Morris County | High | 4.36 / yr | $158M | |
| 11 | Monmouth County | High | 3.54 / yr | $110M | |
| 12 | Camden County | High | 3.64 / yr | $76M | |
| 13 | Somerset County | High | 6.29 / yr | $126M | |
| 14 | Atlantic County | Medium | 2.11 / yr | $50M | |
| 15 | Cape May County | Medium | 1.64 / yr | $39M | |
| 16 | Gloucester County | Medium | 2.57 / yr | $40M | |
| 17 | Hunterdon County | Medium | 3.25 / yr | $50M | |
| 18 | Warren County | Medium | 2.29 / yr | $37M | |
| 19 | Sussex County | Medium | 1.71 / yr | $27M | |
| 20 | Cumberland County | Low | 1.89 / yr | $13M | |
| 21 | Salem County | Low | 1.50 / yr | $14M |
21 New Jersey counties with measurable riverine flood risk. See the national riverine flood ranking or all New Jersey counties by overall risk.
Frequently Asked Questions
Which New Jersey county has the highest riverine flood risk?
Middlesex County has the highest FEMA riverine flood risk score in New Jersey at 98.9 (High), with $197M in expected annual losses and about 3.18 events per year.
How many New Jersey counties face significant riverine flood risk?
21 New Jersey counties record measurable riverine flood risk in FEMA's National Risk Index; 13 of them are rated High or Very High.