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 |
|---|---|---|---|---|
| New Concord Village Reservoir Dam Muskingum County | 42 | 1955 | Significant | Fair |
| Newfields Development Lake Dam Montgomery County | 14 | 1973 | High | Fair |
| New Lexington Reservoir Dam Perry County | 45 | 1936 | High | Poor |
| New London Reservoir Huron County | 39 | 1975 | High | Satisfactory |
| Newport Lake Dam Mahoning County | 28 | 1928 | Significant | Satisfactory |
| Newton Falls Low Head Dam Trumbull County | 17 | 1908 | Significant | Fair |
| New Vienna Wastewater Treatment Lagoons Clinton County | 14 | 1987 | Significant | Fair |
| New Washington Wwt Lagoon Crawford County | 13 | 2000 | Significant | Fair |
| New Waterstone Lake Dam Hamilton County | 19 | 1997 | Significant | Fair |
| New York Central Reservoir Dam Perry County | 12 | 1935 | Significant | Poor |
| Nimisila Reservoir Dam Summit County | 44 | 1936 | High | Poor |
| No. 2 Slurry Pond Belmont County | 300 | — | High | Not Available |
| Noe Lake Dam Brown County | 27 | 1971 | Low | Fair |
| North Baltimore Ug Res No. 1 & 2 Wood County | 24 | 1969 | High | Satisfactory |
| North Branch Kokosing Dam Knox County | 71 | 1972 | High | Not Available |
| North Broadway Low Head Dam Franklin County | 6 | 1969 | Significant | Fair |
| North Kingsville Lake Dam Ashtabula County | 13 | 1968 | Significant | Fair |
| North Kingsville Route 20 Lake Dam Ashtabula County | 22 | 1900 | Significant | Poor |
| North Park Cdf Facility Berm 2-3 Lake County | 33 | 2021 | Low | Satisfactory |
| Northpark Center Retention Dam Montgomery County | 9 | 1995 | Undetermined | Fair |
| North Reservoir Dam Summit County | 13 | 1840 | High | Poor |
| Norwalk Lower Reservoir Huron County | 34 | 1896 | High | Satisfactory |
| Norwalk Memorial Reservoir Huron County | 54 | 1954 | High | Fair |
| Norwalk Upper Reservoir Huron County | 39 | 1896 | High | Satisfactory |
| Nova Pond Dam Ashland County | 15 | 1930 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.