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 251–275 of 397
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hollenbeck Lake Dam Cuyahoga County | 22 | 1953 | High | Poor |
| Holiday Lake Dam Huron County | 40 | 1965 | High | Satisfactory |
| Holiday Haven Lake Dam I Hocking County | 38 | 1961 | High | Satisfactory |
| Holiday Camplands Lake Dam Ashtabula County | 10 | 1975 | High | Fair |
| Hinckley Lake Dam Medina County | 40 | 1928 | High | Poor |
| Highlandtown Lake Dam Columbiana County | 44 | 1966 | High | Poor |
| Hickory Hills Park Lake Dam Portage County | 12 | 1958 | High | Poor |
| Hargus Lake Dam Pickaway County | 66 | 1956 | High | Poor |
| Hammertown Lake Dam Jackson County | 60 | 1954 | High | Poor |
| Guilford Lake Dam Columbiana County | 35 | 1933 | High | Poor |
| Greenwich Reservoir Dam Huron County | 20 | 1921 | High | Poor |
| Grand Rapids Dam Wood County | 8 | 1907 | High | Fair |
| Grand Lake St. Marys - West Embankment Mercer County | 20 | 1841 | High | Poor |
| Grand Lake St. Marys - East Embankment Auglaize County | 18 | 1841 | High | Poor |
| Gorge Plant Dam Summit County | 57 | 1912 | High | Poor |
| Glass Rock Lake Dam Perry County | 54 | — | High | Poor |
| Germantown Dam Montgomery County | 107 | 1922 | High | Fair |
| Georgetown Plant Freshwater Dam Harrison County | 73 | 1949 | High | Not Rated |
| Gavin Bottom Ash Pond Gallia County | 26 | 1974 | High | Satisfactory |
| Galley Hill Lake Dam Clermont County | 63 | 1960 | High | Poor |
| Friendship Park Lake Dam Jefferson County | 94 | 1972 | High | Fair |
| Fremont Upground Reservoir Sandusky County | 34 | 2012 | High | Satisfactory |
| Franz Pond Dam Miami County | 21 | 1876 | High | Poor |
| Four Eagles Lake Dam Preble County | 45 | 1959 | High | Satisfactory |
| Fostoria Upground Reservoir No. 5 Hancock County | 36 | 1958 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.