Coastal Flood Risk in Louisiana
All Louisiana counties ranked by FEMA National Risk Index coastal flood score
Coastal Flood risk — seawater inundation from storm surge, high tides, and rising sea levels — is rated for 29 of 64 Louisiana counties in FEMA's National Risk Index. Jefferson Parish carries the state's highest coastal flood score at 95.6, with $11M in expected annual coastal flood losses.
10 Louisiana counties are rated High or Very High for coastal flood, and expected annual losses from coastal flood total roughly $74M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Coastal Flood
| # | County | Coastal Flood Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Jefferson Parish | Very High | 2.80 / yr | $11M | |
| 2 | St. Charles Parish | Very High | 3.76 / yr | $13M | |
| 3 | Terrebonne Parish | High | 4.20 / yr | $9M | |
| 4 | St. Mary Parish | High | 3.83 / yr | $6M | |
| 5 | St. Martin Parish | High | 3.69 / yr | $3M | |
| 6 | Cameron Parish | High | 3.66 / yr | $4M | |
| 7 | Calcasieu Parish | High | 3.66 / yr | $3M | |
| 8 | St. James Parish | High | 3.76 / yr | $3M | |
| 9 | Plaquemines Parish | High | 4.02 / yr | $3M | |
| 10 | St. Tammany Parish | High | 3.70 / yr | $3M | |
| 11 | Lafourche Parish | Medium | 3.90 / yr | $2M | |
| 12 | Orleans Parish | Medium | 3.75 / yr | $2M | |
| 13 | Livingston Parish | Medium | 3.69 / yr | $2M | |
| 14 | Ascension Parish | Medium | 3.76 / yr | $2M | |
| 15 | Assumption Parish | Medium | 3.69 / yr | $1M | |
| 16 | St. John the Baptist Parish | Medium | 3.76 / yr | $2M | |
| 17 | St. Bernard Parish | Medium | 4.21 / yr | $2M | |
| 18 | Iberia Parish | Medium | 4.23 / yr | $918K | |
| 19 | Tangipahoa Parish | Medium | 3.69 / yr | $817K | |
| 20 | Vermilion Parish | Medium | 4.79 / yr | $705K | |
| 21 | Iberville Parish | Medium | 3.76 / yr | $664K | |
| 22 | East Baton Rouge Parish | Low | 0.01 / yr | $240K | |
| 23 | Jefferson Davis Parish | Low | 0.76 / yr | $43K | |
| 24 | Acadia Parish | Low | 0.01 / yr | $33K | |
| 25 | Lafayette Parish | Low | 0.01 / yr | $51K | |
| 26 | St. Landry Parish | Very Low | 0.01 / yr | $16K | |
| 27 | Allen Parish | Very Low | 0.01 / yr | $4K | |
| 28 | Beauregard Parish | Very Low | 0.01 / yr | $737 | |
| 29 | West Baton Rouge Parish | Very Low | 0.00 / yr | $0 |
29 Louisiana counties with measurable coastal flood risk. See the national coastal flood ranking or all Louisiana counties by overall risk.
Frequently Asked Questions
Which Louisiana county has the highest coastal flood risk?
Jefferson Parish has the highest FEMA coastal flood risk score in Louisiana at 95.6 (Very High), with $11M in expected annual losses and about 2.80 events per year.
How many Louisiana counties face significant coastal flood risk?
29 Louisiana counties record measurable coastal flood risk in FEMA's National Risk Index; 10 of them are rated High or Very High.