Riverine Flood Risk in Louisiana
All Louisiana 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 64 of 64 Louisiana counties in FEMA's National Risk Index. East Baton Rouge Parish carries the state's highest riverine flood score at 97.3, with $103M in expected annual riverine flood losses.
6 Louisiana counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $911M 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 | East Baton Rouge Parish | High | 1.82 / yr | $103M | |
| 2 | Jefferson Parish | High | 2.04 / yr | $76M | |
| 3 | Livingston Parish | High | 0.50 / yr | $76M | |
| 4 | Calcasieu Parish | High | 3.43 / yr | $58M | |
| 5 | St. Tammany Parish | High | 2.32 / yr | $70M | |
| 6 | Orleans Parish | High | 2.68 / yr | $47M | |
| 7 | Lafayette Parish | Medium | 1.75 / yr | $57M | |
| 8 | Caddo Parish | Medium | 3.11 / yr | $35M | |
| 9 | Tangipahoa Parish | Medium | 0.71 / yr | $34M | |
| 10 | St. Landry Parish | Medium | 1.39 / yr | $21M | |
| 11 | Ouachita Parish | Medium | 1.89 / yr | $22M | |
| 12 | Acadia Parish | Medium | 1.00 / yr | $19M | |
| 13 | Rapides Parish | Medium | 1.39 / yr | $16M | |
| 14 | Terrebonne Parish | Medium | 0.71 / yr | $20M | |
| 15 | Iberia Parish | Medium | 1.29 / yr | $15M | |
| 16 | Vermilion Parish | Medium | 0.93 / yr | $15M | |
| 17 | Washington Parish | Medium | 0.71 / yr | $11M | |
| 18 | Ascension Parish | Medium | 0.68 / yr | $18M | |
| 19 | Bossier Parish | Medium | 2.43 / yr | $15M | |
| 20 | St. Martin Parish | Low | 1.04 / yr | $9M | |
| 21 | Jefferson Davis Parish | Low | 1.04 / yr | $10M | |
| 22 | Vernon Parish | Low | 1.00 / yr | $9M | |
| 23 | Sabine Parish | Low | 1.00 / yr | $7M | |
| 24 | Webster Parish | Low | 1.39 / yr | $7M | |
| 25 | Lafourche Parish | Low | 0.71 / yr | $9M | |
| 26 | Evangeline Parish | Low | 0.79 / yr | $6M | |
| 27 | Natchitoches Parish | Low | 1.36 / yr | $7M | |
| 28 | Beauregard Parish | Low | 1.32 / yr | $8M | |
| 29 | Morehouse Parish | Low | 1.46 / yr | $5M | |
| 30 | Union Parish | Low | 1.21 / yr | $6M | |
| 31 | St. John the Baptist Parish | Low | 0.43 / yr | $9M | |
| 32 | East Feliciana Parish | Low | 0.43 / yr | $5M | |
| 33 | Lincoln Parish | Low | 0.79 / yr | $5M | |
| 34 | St. Charles Parish | Low | 1.50 / yr | $8M | |
| 35 | St. Mary Parish | Low | 0.89 / yr | $5M | |
| 36 | De Soto Parish | Low | 1.18 / yr | $4M | |
| 37 | Allen Parish | Low | 0.57 / yr | $5M | |
| 38 | Avoyelles Parish | Low | 0.86 / yr | $4M | |
| 39 | Winn Parish | Low | 1.04 / yr | $3M | |
| 40 | Grant Parish | Low | 1.00 / yr | $4M | |
| 41 | Iberville Parish | Low | 0.46 / yr | $4M | |
| 42 | Claiborne Parish | Low | 0.61 / yr | $2M | |
| 43 | St. Helena Parish | Low | 0.18 / yr | $2M | |
| 44 | St. Bernard Parish | Very Low | 0.68 / yr | $4M | |
| 45 | West Feliciana Parish | Very Low | 0.39 / yr | $3M | |
| 46 | Richland Parish | Very Low | 1.39 / yr | $2M | |
| 47 | Franklin Parish | Very Low | 1.25 / yr | $2M | |
| 48 | Assumption Parish | Very Low | 0.25 / yr | $2M | |
| 49 | Jackson Parish | Very Low | 0.50 / yr | $2M | |
| 50 | Plaquemines Parish | Very Low | 0.29 / yr | $3M | |
| 51 | Pointe Coupee Parish | Very Low | 0.57 / yr | $2M | |
| 52 | St. James Parish | Very Low | 0.57 / yr | $2M | |
| 53 | Bienville Parish | Very Low | 0.89 / yr | $2M | |
| 54 | LaSalle Parish | Very Low | 0.75 / yr | $3M | |
| 55 | Concordia Parish | Very Low | 1.04 / yr | $2M | |
| 56 | Madison Parish | Very Low | 0.79 / yr | $1M | |
| 57 | Red River Parish | Very Low | 0.75 / yr | $1M | |
| 58 | Caldwell Parish | Very Low | 0.57 / yr | $2M | |
| 59 | Catahoula Parish | Very Low | 0.79 / yr | $1M | |
| 60 | West Baton Rouge Parish | Very Low | 0.25 / yr | $2M | |
| 61 | West Carroll Parish | Very Low | 1.04 / yr | $833K | |
| 62 | East Carroll Parish | Very Low | 0.75 / yr | $699K | |
| 63 | Tensas Parish | Very Low | 0.93 / yr | $672K | |
| 64 | Cameron Parish | Very Low | 0.39 / yr | $841K |
64 Louisiana counties with measurable riverine flood risk. See the national riverine flood ranking or all Louisiana counties by overall risk.
Frequently Asked Questions
Which Louisiana county has the highest riverine flood risk?
East Baton Rouge Parish has the highest FEMA riverine flood risk score in Louisiana at 97.3 (High), with $103M in expected annual losses and about 1.82 events per year.
How many Louisiana counties face significant riverine flood risk?
64 Louisiana counties record measurable riverine flood risk in FEMA's National Risk Index; 6 of them are rated High or Very High.