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 951–975 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Gonzalez Lake Dam Stark County | 13 | 1995 | Low | Fair |
| Golden Bear Reservoir Dam Delaware County | 26 | 1972 | Low | Poor |
| Goettl Lake Dam Richland County | 17 | 1959 | Undetermined | Not Rated |
| Glen Willow Lake Dam Clermont County | 18 | — | Significant | Poor |
| Glen Ridge Lake Dam Clermont County | 42 | 1950 | Significant | Fair |
| Glass Rock Lake Dam Perry County | 54 | — | High | Poor |
| Giel Lake Dam Geauga County | 15 | — | Significant | Poor |
| Germantown Dam Montgomery County | 107 | 1922 | High | Fair |
| Gerding Lake Dam Medina County | 30 | — | Low | Fair |
| Georgetown Upper Pond No. 2 Dam Harrison County | 22 | 1978 | Low | Poor |
| Georgetown Upground Reservoir Brown County | 27 | 1959 | Significant | Poor |
| Georgetown Plant Upper Supply Pond Dam Harrison County | 10 | 1948 | Significant | Not Rated |
| Georgetown Plant Lower Supply Pond Dam Harrison County | 45 | 1951 | Significant | Not Rated |
| Georgetown Plant Freshwater Dam Harrison County | 73 | 1949 | High | Not Rated |
| George'S Pond Dam Vinton County | 30 | 1960 | Low | Fair |
| Genon Energy South Pond Dam Trumbull County | 14 | — | Significant | Satisfactory |
| Genon Energy North Pond Dam Trumbull County | 20 | 1955 | Significant | Satisfactory |
| Genoa Ug Sewage Disposal Lgn Cells 1,2,3&4 Ottawa County | 10 | 1963 | Significant | Satisfactory |
| Geneva Hills Lake Dam Fairfield County | 30 | — | Significant | Fair |
| General Motors Secondary Lagoon Defiance County | 29 | — | Significant | Poor |
| General Motors Primary Lagoon Defiance County | 30 | 1940 | Significant | Fair |
| Gavin Bottom Ash Pond Gallia County | 26 | 1974 | High | Satisfactory |
| Galley Hill Lake Dam Clermont County | 63 | 1960 | High | Poor |
| Gallery Lake Dam Medina County | 12 | — | Significant | Poor |
| Galicki Lake Dam Ashtabula County | 22 | 1973 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.