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 901–925 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Oakwood Wwt Lagoon Paulding County | 10 | 1995 | Significant | Fair |
| Oberlin Old Upground Reservoir Lorain County | 17 | 1960 | Low | Fair |
| Oberlin Upground Reservoir Lorain County | 20 | 1960 | High | Fair |
| O'Bob Farm Lake Dam Butler County | 29 | 1968 | Undetermined | Not Rated |
| O'Brien Lake Dam Ashtabula County | 24 | 1968 | Low | Poor |
| Obringer Upground Reservoir Crawford County | 13 | 1990 | Significant | Fair |
| Ockenga Lake Dam Huron County | 29 | 1966 | Low | Poor |
| Oeder Lake No. 3 Dam Warren County | 39 | 1953 | Significant | Satisfactory |
| Ohio Farmette Lake Dam Portage County | 9 | — | Undetermined | Not Rated |
| Ohio Power Company Pond Dam Mum-100 Muskingum County | 15 | — | Low | Fair |
| Ohio Power Company Pond Mb-115 Dam Morgan County | 38 | 1967 | Low | Fair |
| Ohio Power Company Pond Mb-133 Dam Morgan County | 35 | 1966 | Undetermined | Not Rated |
| Ohio Power Company Pond Mb-141 Dam Morgan County | 38 | 1968 | Low | Fair |
| Ohio Power Company Pond Mb-144 Pond Morgan County | 30 | 1968 | Low | Fair |
| Ohio Power Company Pond Mb-46 Dam Morgan County | 59 | 1960 | Significant | Fair |
| Ohio Power Company Pond Mm-52 Dam Morgan County | 35 | 1962 | Significant | Fair |
| Ohio Power Company Pond Mmv-11 Dam Morgan County | 50 | 1964 | Significant | Fair |
| Ohio Power Company Pond Mum-67 Muskingum County | 36 | — | Low | Poor |
| Ohio Power Company Pond Nb-43 Dam Noble County | 60 | 1966 | Significant | Fair |
| Ohio Power Company Pond Nb-64 Dam Noble County | 38 | 1962 | Low | Fair |
| Ohio Power Company Pond Nb-90 Dam Noble County | 51 | 1974 | Significant | Fair |
| Ohio River Collieries Sediment Pond Dam Guernsey County | 26 | 1979 | Low | Fair |
| Old Man'S Cave Lake Dam Hocking County | 64 | 1972 | High | Poor |
| Olivito Lake Dam Carroll County | 32 | 1973 | Low | Poor |
| O'Neill Lake Dam Cuyahoga County | 28 | — | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.