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

#CountyRiverine Flood ScoreRatingAnn. Freq.Ann. Loss
1 East Baton Rouge Parish
97.3
High 1.82 / yr $103M
2 Jefferson Parish
96.0
High 2.04 / yr $76M
3 Livingston Parish
94.9
High 0.50 / yr $76M
4 Calcasieu Parish
94.5
High 3.43 / yr $58M
5 St. Tammany Parish
94.2
High 2.32 / yr $70M
6 Orleans Parish
93.5
High 2.68 / yr $47M
7 Lafayette Parish
93.0
Medium 1.75 / yr $57M
8 Caddo Parish
92.0
Medium 3.11 / yr $35M
9 Tangipahoa Parish
91.2
Medium 0.71 / yr $34M
10 St. Landry Parish
87.4
Medium 1.39 / yr $21M
11 Ouachita Parish
87.1
Medium 1.89 / yr $22M
12 Acadia Parish
86.4
Medium 1.00 / yr $19M
13 Rapides Parish
82.2
Medium 1.39 / yr $16M
14 Terrebonne Parish
81.9
Medium 0.71 / yr $20M
15 Iberia Parish
81.4
Medium 1.29 / yr $15M
16 Vermilion Parish
79.5
Medium 0.93 / yr $15M
17 Washington Parish
79.0
Medium 0.71 / yr $11M
18 Ascension Parish
77.8
Medium 0.68 / yr $18M
19 Bossier Parish
74.0
Medium 2.43 / yr $15M
20 St. Martin Parish
69.5
Low 1.04 / yr $9M
21 Jefferson Davis Parish
66.7
Low 1.04 / yr $10M
22 Vernon Parish
66.6
Low 1.00 / yr $9M
23 Sabine Parish
66.5
Low 1.00 / yr $7M
24 Webster Parish
65.0
Low 1.39 / yr $7M
25 Lafourche Parish
64.6
Low 0.71 / yr $9M
26 Evangeline Parish
62.3
Low 0.79 / yr $6M
27 Natchitoches Parish
61.3
Low 1.36 / yr $7M
28 Beauregard Parish
59.9
Low 1.32 / yr $8M
29 Morehouse Parish
59.4
Low 1.46 / yr $5M
30 Union Parish
57.8
Low 1.21 / yr $6M
31 St. John the Baptist Parish
57.4
Low 0.43 / yr $9M
32 East Feliciana Parish
54.6
Low 0.43 / yr $5M
33 Lincoln Parish
54.3
Low 0.79 / yr $5M
34 St. Charles Parish
54.0
Low 1.50 / yr $8M
35 St. Mary Parish
50.1
Low 0.89 / yr $5M
36 De Soto Parish
46.2
Low 1.18 / yr $4M
37 Allen Parish
45.1
Low 0.57 / yr $5M
38 Avoyelles Parish
44.5
Low 0.86 / yr $4M
39 Winn Parish
40.9
Low 1.04 / yr $3M
40 Grant Parish
40.1
Low 1.00 / yr $4M
41 Iberville Parish
36.5
Low 0.46 / yr $4M
42 Claiborne Parish
35.2
Low 0.61 / yr $2M
43 St. Helena Parish
35.0
Low 0.18 / yr $2M
44 St. Bernard Parish
32.2
Very Low 0.68 / yr $4M
45 West Feliciana Parish
31.5
Very Low 0.39 / yr $3M
46 Richland Parish
30.8
Very Low 1.39 / yr $2M
47 Franklin Parish
30.6
Very Low 1.25 / yr $2M
48 Assumption Parish
29.6
Very Low 0.25 / yr $2M
49 Jackson Parish
27.6
Very Low 0.50 / yr $2M
50 Plaquemines Parish
26.4
Very Low 0.29 / yr $3M
51 Pointe Coupee Parish
26.3
Very Low 0.57 / yr $2M
52 St. James Parish
25.5
Very Low 0.57 / yr $2M
53 Bienville Parish
25.1
Very Low 0.89 / yr $2M
54 LaSalle Parish
23.4
Very Low 0.75 / yr $3M
55 Concordia Parish
22.8
Very Low 1.04 / yr $2M
56 Madison Parish
18.0
Very Low 0.79 / yr $1M
57 Red River Parish
17.9
Very Low 0.75 / yr $1M
58 Caldwell Parish
17.6
Very Low 0.57 / yr $2M
59 Catahoula Parish
14.5
Very Low 0.79 / yr $1M
60 West Baton Rouge Parish
13.0
Very Low 0.25 / yr $2M
61 West Carroll Parish
9.0
Very Low 1.04 / yr $833K
62 East Carroll Parish
8.7
Very Low 0.75 / yr $699K
63 Tensas Parish
8.0
Very Low 0.93 / yr $672K
64 Cameron Parish
5.9
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.

Other Hazards in Louisiana