Riverine Flood Risk in Connecticut
All Connecticut 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 9 of 9 Connecticut counties in FEMA's National Risk Index. Capitol Planning Region carries the state's highest riverine flood score at 99.0, with $240M in expected annual riverine flood losses.
5 Connecticut counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $858M 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 | Capitol Planning Region | High | 3.54 / yr | $240M | |
| 2 | Western Connecticut Planning Region | High | 3.54 / yr | $183M | |
| 3 | South Central Connecticut Planning Region | High | 3.25 / yr | $108M | |
| 4 | Naugatuck Valley Planning Region | High | 3.54 / yr | $101M | |
| 5 | Greater Bridgeport Planning Region | High | 3.54 / yr | $61M | |
| 6 | Southeastern Connecticut Planning Region | Medium | 2.25 / yr | $52M | |
| 7 | Lower Connecticut River Valley Planning Region | Medium | 2.25 / yr | $49M | |
| 8 | Northwest Hills Planning Region | Medium | 3.54 / yr | $42M | |
| 9 | Northeastern Connecticut Planning Region | Medium | 2.25 / yr | $24M |
9 Connecticut counties with measurable riverine flood risk. See the national riverine flood ranking or all Connecticut counties by overall risk.
Frequently Asked Questions
Which Connecticut county has the highest riverine flood risk?
Capitol Planning Region has the highest FEMA riverine flood risk score in Connecticut at 99.0 (High), with $240M in expected annual losses and about 3.54 events per year.
How many Connecticut counties face significant riverine flood risk?
9 Connecticut counties record measurable riverine flood risk in FEMA's National Risk Index; 5 of them are rated High or Very High.