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
| # | County | Riverine Flood Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Franklin County | High | 3.50 / yr | $210M | |
| 2 | Cuyahoga County | High | 2.75 / yr | $178M | |
| 3 | Hamilton County | High | 5.07 / yr | $109M | |
| 4 | Montgomery County | High | 2.39 / yr | $80M | |
| 5 | Lucas County | High | 1.75 / yr | $71M | |
| 6 | Summit County | High | 1.39 / yr | $65M | |
| 7 | Butler County | Medium | 2.57 / yr | $62M | |
| 8 | Stark County | Medium | 2.18 / yr | $50M | |
| 9 | Lorain County | Medium | 2.21 / yr | $43M | |
| 10 | Trumbull County | Medium | 2.14 / yr | $29M | |
| 11 | Mahoning County | Medium | 1.14 / yr | $27M | |
| 12 | Belmont County | Medium | 3.36 / yr | $25M | |
| 13 | Delaware County | Medium | 1.71 / yr | $49M | |
| 14 | Lake County | Medium | 1.39 / yr | $31M | |
| 15 | Licking County | Medium | 2.54 / yr | $33M | |
| 16 | Clark County | Medium | 2.11 / yr | $22M | |
| 17 | Warren County | Medium | 3.11 / yr | $39M | |
| 18 | Muskingum County | Medium | 1.96 / yr | $24M | |
| 19 | Lawrence County | Medium | 2.79 / yr | $22M | |
| 20 | Athens County | Medium | 3.14 / yr | $21M | |
| 21 | Allen County | Medium | 0.39 / yr | $23M | |
| 22 | Tuscarawas County | Medium | 2.43 / yr | $17M | |
| 23 | Columbiana County | Medium | 1.93 / yr | $19M | |
| 24 | Scioto County | Medium | 3.50 / yr | $20M | |
| 25 | Fairfield County | Medium | 1.93 / yr | $27M | |
| 26 | Jefferson County | Medium | 1.39 / yr | $18M | |
| 27 | Clermont County | Medium | 3.61 / yr | $26M | |
| 28 | Washington County | Medium | 4.04 / yr | $19M | |
| 29 | Wood County | Medium | 1.18 / yr | $29M | |
| 30 | Medina County | Medium | 1.57 / yr | $21M | |
| 31 | Greene County | Medium | 2.14 / yr | $20M | |
| 32 | Portage County | Medium | 1.00 / yr | $19M | |
| 33 | Brown County | Medium | 2.50 / yr | $13M | |
| 34 | Ross County | Medium | 2.39 / yr | $15M | |
| 35 | Geauga County | Medium | 1.00 / yr | $14M | |
| 36 | Meigs County | Low | 3.07 / yr | $10M | |
| 37 | Ashtabula County | Low | 1.50 / yr | $12M | |
| 38 | Ottawa County | Low | 1.07 / yr | $15M | |
| 39 | Knox County | Low | 0.93 / yr | $12M | |
| 40 | Wayne County | Low | 0.93 / yr | $13M | |
| 41 | Erie County | Low | 2.07 / yr | $13M | |
| 42 | Richland County | Low | 1.68 / yr | $14M | |
| 43 | Holmes County | Low | 1.29 / yr | $8M | |
| 44 | Miami County | Low | 1.57 / yr | $17M | |
| 45 | Hocking County | Low | 2.50 / yr | $12M | |
| 46 | Sandusky County | Low | 1.39 / yr | $12M | |
| 47 | Logan County | Low | 2.14 / yr | $13M | |
| 48 | Gallia County | Low | 2.96 / yr | $9M | |
| 49 | Coshocton County | Low | 2.93 / yr | $8M | |
| 50 | Pickaway County | Low | 1.89 / yr | $12M | |
| 51 | Hancock County | Low | 1.39 / yr | $19M | |
| 52 | Marion County | Low | 2.00 / yr | $10M | |
| 53 | Adams County | Low | 2.96 / yr | $10M | |
| 54 | Pike County | Low | 2.14 / yr | $8M | |
| 55 | Shelby County | Low | 1.93 / yr | $9M | |
| 56 | Seneca County | Low | 1.00 / yr | $10M | |
| 57 | Huron County | Low | 1.14 / yr | $9M | |
| 58 | Ashland County | Low | 1.61 / yr | $9M | |
| 59 | Darke County | Low | 2.04 / yr | $11M | |
| 60 | Defiance County | Low | 0.50 / yr | $11M | |
| 61 | Guernsey County | Low | 2.07 / yr | $7M | |
| 62 | Jackson County | Low | 1.57 / yr | $6M | |
| 63 | Highland County | Low | 1.75 / yr | $8M | |
| 64 | Auglaize County | Low | 1.89 / yr | $9M | |
| 65 | Henry County | Low | 0.43 / yr | $10M | |
| 66 | Putnam County | Low | 0.43 / yr | $9M | |
| 67 | Union County | Low | 1.50 / yr | $13M | |
| 68 | Crawford County | Low | 1.07 / yr | $8M | |
| 69 | Williams County | Low | 0.21 / yr | $6M | |
| 70 | Preble County | Low | 1.61 / yr | $7M | |
| 71 | Monroe County | Low | 1.89 / yr | $5M | |
| 72 | Perry County | Low | 1.61 / yr | $6M | |
| 73 | Morgan County | Low | 1.29 / yr | $6M | |
| 74 | Morrow County | Low | 0.79 / yr | $6M | |
| 75 | Clinton County | Low | 1.68 / yr | $6M | |
| 76 | Champaign County | Low | 1.39 / yr | $7M | |
| 77 | Carroll County | Low | 1.79 / yr | $5M | |
| 78 | Fayette County | Low | 1.18 / yr | $6M | |
| 79 | Mercer County | Low | 2.25 / yr | $9M | |
| 80 | Fulton County | Low | 0.39 / yr | $6M | |
| 81 | Madison County | Low | 1.00 / yr | $7M | |
| 82 | Hardin County | Low | 1.36 / yr | $6M | |
| 83 | Paulding County | Low | 0.46 / yr | $5M | |
| 84 | Noble County | Low | 2.21 / yr | $3M | |
| 85 | Vinton County | Very Low | 2.43 / yr | $3M | |
| 86 | Van Wert County | Very Low | 0.50 / yr | $5M | |
| 87 | Wyandot County | Very Low | 1.04 / yr | $5M | |
| 88 | Harrison County | 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.