Ohio Dams
1,377 dams tracked by the National Inventory of Dams
Total Dams
1,377
High Hazard
397
28.8%
Poor / Unsatisfactory
509
Average Age
65 yrs
Hazard Classification
High397 (28.8%)
Significant564 (41.0%)
Low339 (24.6%)
Condition Assessment
Satisfactory324 (23.5%)
Fair421 (30.6%)
Poor / Unsatisfactory509 (37.0%)
Not Rated123 (8.9%)
Federal
39
State
115
Local
356
Private
753
Tallest Dams
High Hazard Dams
Poor Condition Dams
All Dams in Ohio
Showing 876–900 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hillsboro Reservoir No. 1 Dam Highland County | 42 | 1945 | Significant | Fair |
| Highlandtown Lake Dam Columbiana County | 44 | 1966 | High | Poor |
| High Lands Golf Club Dam Licking County | 31 | 1988 | Low | Poor |
| Highland Estates Hoa Dam Licking County | 36 | 1990 | Undetermined | Not Rated |
| Hidden Valley Acres Dam Holmes County | 30 | 1958 | Significant | Poor |
| Hidden Lakes Upper Dam Meigs County | 26 | — | Significant | Poor |
| Hidden Lakes Dam Geauga County | 22 | 1954 | Significant | Poor |
| Hidden Lake Dam Hocking County | 28 | 1957 | Significant | Satisfactory |
| Hidden Lake Dam Miami County | 21 | 1977 | Significant | Poor |
| Hidden Hill Lake Dam Clermont County | 32 | 1943 | Low | Poor |
| Hidden Haven Lake Dam Guernsey County | 44 | 1961 | Significant | Fair |
| Hickory Nut Golf Course Lake Dam Lorain County | 17 | 1963 | Significant | Poor |
| Hickory Lake Dam Holmes County | 39 | 1967 | Low | Fair |
| Hickory Lake Dam Defiance County | 26 | 1964 | Significant | Poor |
| Hickory Hollow Lake Dam Guernsey County | 32 | 1969 | Low | Fair |
| Hickory Hills Park Lake Dam Portage County | 12 | 1958 | High | Poor |
| Hickory Hills Lake Dam Highland County | 44 | 1971 | Significant | Satisfactory |
| Hetrick Lake Dam Muskingum County | 29 | — | Low | Satisfactory |
| Hess Wetlands Dam Geauga County | 10 | 2005 | Undetermined | Not Rated |
| Hermitage Club Lake Dam Hamilton County | 38 | 1918 | Significant | Fair |
| Herbert Pond Dam Coshocton County | 26 | 1979 | Low | Fair |
| Heimann Pond Dam Hamilton County | 35 | 1964 | Significant | Fair |
| Heil Lake Dam Guernsey County | 26 | 1991 | Significant | Fair |
| Heart of Ohio Fish & Game Lake Dam Union County | 15 | — | Undetermined | Not Rated |
| Hay Hollow Reservoir Dam Pike County | 34 | 1952 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.