Riverine Flood Risk in Ohio

All Ohio 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 88 of 88 Ohio counties in FEMA's National Risk Index. Franklin County carries the state's highest riverine flood score at 98.8, with $210M in expected annual riverine flood losses.

6 Ohio counties are rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $1.95B 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 Franklin County
98.8
High 3.50 / yr $210M
2 Cuyahoga County
98.7
High 2.75 / yr $178M
3 Hamilton County
96.9
High 5.07 / yr $109M
4 Montgomery County
95.5
High 2.39 / yr $80M
5 Lucas County
95.4
High 1.75 / yr $71M
6 Summit County
94.0
High 1.39 / yr $65M
7 Butler County
93.0
Medium 2.57 / yr $62M
8 Stark County
91.7
Medium 2.18 / yr $50M
9 Lorain County
90.2
Medium 2.21 / yr $43M
10 Trumbull County
88.8
Medium 2.14 / yr $29M
11 Mahoning County
88.1
Medium 1.14 / yr $27M
12 Belmont County
87.0
Medium 3.36 / yr $25M
13 Delaware County
86.4
Medium 1.71 / yr $49M
14 Lake County
86.1
Medium 1.39 / yr $31M
15 Licking County
86.0
Medium 2.54 / yr $33M
16 Clark County
84.2
Medium 2.11 / yr $22M
17 Warren County
83.9
Medium 3.11 / yr $39M
18 Muskingum County
83.8
Medium 1.96 / yr $24M
19 Lawrence County
83.7
Medium 2.79 / yr $22M
20 Athens County
83.7
Medium 3.14 / yr $21M
21 Allen County
83.0
Medium 0.39 / yr $23M
22 Tuscarawas County
82.3
Medium 2.43 / yr $17M
23 Columbiana County
82.2
Medium 1.93 / yr $19M
24 Scioto County
82.0
Medium 3.50 / yr $20M
25 Fairfield County
81.8
Medium 1.93 / yr $27M
26 Jefferson County
81.6
Medium 1.39 / yr $18M
27 Clermont County
81.3
Medium 3.61 / yr $26M
28 Washington County
80.5
Medium 4.04 / yr $19M
29 Wood County
75.7
Medium 1.18 / yr $29M
30 Medina County
75.5
Medium 1.57 / yr $21M
31 Greene County
75.4
Medium 2.14 / yr $20M
32 Portage County
75.3
Medium 1.00 / yr $19M
33 Brown County
75.0
Medium 2.50 / yr $13M
34 Ross County
74.5
Medium 2.39 / yr $15M
35 Geauga County
73.3
Medium 1.00 / yr $14M
36 Meigs County
72.7
Low 3.07 / yr $10M
37 Ashtabula County
72.6
Low 1.50 / yr $12M
38 Ottawa County
72.6
Low 1.07 / yr $15M
39 Knox County
72.0
Low 0.93 / yr $12M
40 Wayne County
71.9
Low 0.93 / yr $13M
41 Erie County
71.8
Low 2.07 / yr $13M
42 Richland County
71.6
Low 1.68 / yr $14M
43 Holmes County
71.2
Low 1.29 / yr $8M
44 Miami County
70.1
Low 1.57 / yr $17M
45 Hocking County
68.8
Low 2.50 / yr $12M
46 Sandusky County
67.7
Low 1.39 / yr $12M
47 Logan County
67.7
Low 2.14 / yr $13M
48 Gallia County
67.6
Low 2.96 / yr $9M
49 Coshocton County
66.8
Low 2.93 / yr $8M
50 Pickaway County
66.0
Low 1.89 / yr $12M
51 Hancock County
65.4
Low 1.39 / yr $19M
52 Marion County
64.9
Low 2.00 / yr $10M
53 Adams County
64.3
Low 2.96 / yr $10M
54 Pike County
63.9
Low 2.14 / yr $8M
55 Shelby County
63.3
Low 1.93 / yr $9M
56 Seneca County
61.2
Low 1.00 / yr $10M
57 Huron County
60.5
Low 1.14 / yr $9M
58 Ashland County
60.2
Low 1.61 / yr $9M
59 Darke County
60.1
Low 2.04 / yr $11M
60 Defiance County
59.4
Low 0.50 / yr $11M
61 Guernsey County
58.9
Low 2.07 / yr $7M
62 Jackson County
57.2
Low 1.57 / yr $6M
63 Highland County
56.6
Low 1.75 / yr $8M
64 Auglaize County
55.5
Low 1.89 / yr $9M
65 Henry County
55.1
Low 0.43 / yr $10M
66 Putnam County
52.8
Low 0.43 / yr $9M
67 Union County
52.7
Low 1.50 / yr $13M
68 Crawford County
51.9
Low 1.07 / yr $8M
69 Williams County
51.8
Low 0.21 / yr $6M
70 Preble County
51.4
Low 1.61 / yr $7M
71 Monroe County
50.9
Low 1.89 / yr $5M
72 Perry County
47.0
Low 1.61 / yr $6M
73 Morgan County
45.3
Low 1.29 / yr $6M
74 Morrow County
45.0
Low 0.79 / yr $6M
75 Clinton County
44.7
Low 1.68 / yr $6M
76 Champaign County
43.8
Low 1.39 / yr $7M
77 Carroll County
42.8
Low 1.79 / yr $5M
78 Fayette County
42.5
Low 1.18 / yr $6M
79 Mercer County
42.1
Low 2.25 / yr $9M
80 Fulton County
41.7
Low 0.39 / yr $6M
81 Madison County
41.5
Low 1.00 / yr $7M
82 Hardin County
40.2
Low 1.36 / yr $6M
83 Paulding County
39.2
Low 0.46 / yr $5M
84 Noble County
35.8
Low 2.21 / yr $3M
85 Vinton County
34.6
Very Low 2.43 / yr $3M
86 Van Wert County
33.7
Very Low 0.50 / yr $5M
87 Wyandot County
30.5
Very Low 1.04 / yr $5M
88 Harrison County
27.3
Very Low 1.36 / yr $2M

88 Ohio counties with measurable riverine flood risk. See the national riverine flood ranking or all Ohio counties by overall risk.

Frequently Asked Questions

Which Ohio county has the highest riverine flood risk?

Franklin County has the highest FEMA riverine flood risk score in Ohio at 98.8 (High), with $210M in expected annual losses and about 3.50 events per year.

How many Ohio counties face significant riverine flood risk?

88 Ohio counties record measurable riverine flood risk in FEMA's National Risk Index; 6 of them are rated High or Very High.

Other Hazards in Ohio