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Missouri inland flooding risk

115 counties scored 0 rated Very High

St. Louis County has the highest inland flooding risk in Missouri, scoring 99.1 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Missouri have decreased 16% over the past five years compared to the prior five-year period.

# County NRI score Rating NOAA events
2016–2026
1 St. Louis County 99.1 Relatively High 31
2 St. Louis 97 Relatively High 13
3 Jackson County 96.5 Relatively High 59
4 St. Charles County 94.2 Relatively High 11
5 Camden County 93.3 Relatively Moderate 24
6 Jefferson County 91.4 Relatively Moderate 15
7 Taney County 89.1 Relatively Moderate 82
8 Greene County 88.8 Relatively Moderate 152
9 Boone County 87.8 Relatively Moderate 16
10 Clay County 87.8 Relatively Moderate 29
11 Franklin County 85.4 Relatively Moderate 11
12 Jasper County 84.9 Relatively Moderate 92
13 Morgan County 82.7 Relatively Moderate 39
14 Newton County 80 Relatively Moderate 86
15 Howell County 79.6 Relatively Moderate 136
16 Barry County 79.4 Relatively Moderate 127
17 Butler County 79.1 Relatively Moderate 34
18 Cape Girardeau County 78.1 Relatively Moderate 58
19 Stone County 74.7 Relatively Moderate 47
20 McDonald County 73.7 Relatively Moderate 93
21 Cole County 73.5 Relatively Moderate 9
22 Cass County 70.5 Relatively Low 28
23 St. Francois County 70.4 Relatively Low 13
24 Lincoln County 70.3 Relatively Low 15
25 Christian County 70 Relatively Low 83
26 Wayne County 68.6 Relatively Low 41
27 Buchanan County 68.5 Relatively Low 14
28 Callaway County 68.4 Relatively Low 9
29 Benton County 67.4 Relatively Low 42
30 Lawrence County 67.2 Relatively Low 64
31 Platte County 65.9 Relatively Low 21
32 Clinton County 65.6 Relatively Low 2
33 Iron County 64.5 Relatively Low 8
34 Pulaski County 62.4 Relatively Low 36
35 Wright County 62.3 Relatively Low 141
36 Miller County 61.5 Relatively Low 26
37 Laclede County 61.4 Relatively Low 74
38 Warren County 61.2 Relatively Low 8
39 Henry County 61.1 Relatively Low 11
40 Carter County 60.6 Relatively Low 31
41 Pettis County 60.3 Relatively Low 9
42 Johnson County 59.7 Relatively Low 23
43 Ripley County 59.4 Relatively Low 26
44 Marion County 59.3 Relatively Low 4
45 Saline County 58.5 Relatively Low 17
46 Polk County 57.9 Relatively Low 77
47 Audrain County 55.3 Relatively Low 6
48 Madison County 54.3 Relatively Low 8
49 Reynolds County 54.1 Relatively Low 5
50 Ste. Genevieve County 52.6 Relatively Low 4
51 Washington County 52.6 Relatively Low 8
52 Phelps County 52.4 Relatively Low 35
53 Nodaway County 51 Relatively Low 5
54 Vernon County 49.8 Relatively Low 32
55 Texas County 49.2 Relatively Low 71
56 Scott County 49 Relatively Low 23
57 Ray County 48.8 Relatively Low 7
58 Montgomery County 47.9 Relatively Low 8
59 Macon County 47.7 Relatively Low 7
60 Crawford County 47.6 Relatively Low 8
61 Osage County 47.5 Relatively Low 12
62 Oregon County 46.4 Relatively Low 39
63 Gasconade County 46.1 Relatively Low 8
64 Shannon County 46 Relatively Low 72
65 Barton County 45.9 Relatively Low 51
66 Carroll County 45.4 Relatively Low 13
67 Pike County 45.1 Relatively Low 2
68 Lafayette County 44.3 Relatively Low 15
69 Chariton County 44.1 Relatively Low 8
70 Webster County 43.4 Relatively Low 126
71 Dunklin County 42.7 Relatively Low 8
72 Ozark County 42 Relatively Low 162
73 Stoddard County 41.6 Relatively Low 22
74 Bates County 39.5 Relatively Low 8
75 Linn County 39 Relatively Low 3
76 Dallas County 37.9 Relatively Low 62
77 Randolph County 37.4 Relatively Low 3
78 Lewis County 37.1 Relatively Low 4
79 Daviess County 36.2 Relatively Low 14
80 St. Clair County 35.8 Relatively Low 12
81 Bollinger County 33 Very Low 22
82 Dent County 32.7 Very Low 55
83 Moniteau County 32.5 Very Low 4
84 Hickory County 32.4 Very Low 45
85 Perry County 32.1 Very Low 19
86 Adair County 31.4 Very Low 4
87 Clark County 30.5 Very Low 15
88 Grundy County 30.2 Very Low 16
89 Cooper County 29.9 Very Low 8
90 Maries County 28.9 Very Low 17
91 Harrison County 28.1 Very Low 11
92 Dade County 27.7 Very Low 19
93 Pemiscot County 27.5 Very Low 1
94 Ralls County 27.2 Very Low 5
95 Gentry County 27.1 Very Low 5
96 Douglas County 27 Very Low 225
97 Livingston County 26.4 Very Low 8
98 Atchison County 25.6 Very Low 7
99 Mississippi County 25.5 Very Low 11
100 Andrew County 24.7 Very Low 9
101 Cedar County 24.7 Very Low 13
102 Monroe County 24.1 Very Low 4
103 Knox County 23.3 Very Low 2
104 Howard County 23.2 Very Low 11
105 New Madrid County 22.6 Very Low 30
106 Caldwell County 21.9 Very Low 12
107 Holt County 21.7 Very Low 6
108 DeKalb County 21 Very Low 7
109 Scotland County 18.3 Very Low 4
110 Mercer County 17.9 Very Low 5
111 Shelby County 14.6 Very Low 5
112 Sullivan County 12.4 Very Low 3
113 Putnam County 10.1 Very Low 7
114 Schuyler County 6.1 Very Low 0
115 Worth County 4.6 Very Low 1

Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.

Inland Flooding risk nationally:

Top 50 US counties

Other hazard risks in Missouri:

WildfireCoastal FloodingEarthquakeHeat WaveTornadoHurricaneHailStrong WindWinter WeatherIce StormCold WaveLightningDroughtLandslideAvalancheTsunamiVolcanic Activity

Frequently asked questions

What is the highest inland flooding risk county in Missouri?

St. Louis County, MO has the highest inland flooding risk in Missouri, with a FEMA National Risk Index score of 99.1 out of 100 (rated "Relatively High").

What causes inland flooding risk in Missouri?

Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.