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 1151–1175 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Spencer Lake - North Dam Medina County | 14 | 1960 | Low | Fair |
| Spencer Lake - South Dam Medina County | 17 | 1960 | Significant | Fair |
| Spring Haven Lake Dam Carroll County | 26 | — | Low | Poor |
| Spring Lake Dam Guernsey County | 33 | 1951 | Undetermined | Not Rated |
| Spring Lake Dam Greene County | 29 | 1969 | Low | Fair |
| Spring Valley Lake Dam Warren County | 8 | — | Undetermined | Not Rated |
| Spring Valley Lake Dam Columbiana County | 14 | — | Low | Poor |
| Spring Valley Park Lake Dam Columbiana County | 29 | 1993 | High | Poor |
| Springwater Park Lake Dam Portage County | 22 | 1945 | Significant | Poor |
| Springwood Lake Dam Stark County | 24 | 1989 | Low | Fair |
| Sproat Lake Dam Vinton County | 35 | 1962 | Significant | Fair |
| Squaw Valley Lake Dam Stark County | 18 | 1964 | Low | Fair |
| Stanley Lower Lake Dam Carroll County | 25 | 1933 | Significant | Poor |
| Stanley Upper Lake Dam Carroll County | 37 | 1933 | Significant | Poor |
| Stark Lime Sludge Lagoon Stark County | 34 | — | Significant | Poor |
| Star Lite Lake Dam Fayette County | 25 | — | Low | Poor |
| St. Clairsville Reservoir No. 1 Dam Belmont County | 36 | 1929 | High | Satisfactory |
| St. Clairsville Reservoir No. 2 Dam Belmont County | 31 | 1920 | High | Satisfactory |
| Steeplechase Lake Dam Summit County | 21 | 1989 | High | Satisfactory |
| Stevens Lake Dam Harrison County | 39 | 1963 | High | Poor |
| St. Henry Wwt Lagoon Mercer County | 27 | 1988 | Significant | Satisfactory |
| Stingy Run Fly Ash Dam Gallia County | 93 | 1974 | High | Satisfactory |
| St. John Vianney Seminary Lake Dam Jefferson County | 17 | 1942 | Low | Poor |
| St. Marys Lime Sludge Lagoons Auglaize County | 13 | 1988 | Significant | Satisfactory |
| Stockport Mill Country Inn Water Power Project Morgan County | 20 | 1891 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.