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 326–350 of 501
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Happy Hills Lake Dam Hocking County | 44 | 1954 | Significant | Poor |
| Hammond Lake Ii Dam Columbiana County | 17 | 1951 | Low | Poor |
| Hammond Lake Dam Pike County | 28 | — | Low | Poor |
| Hammertown Lake Dam Jackson County | 60 | 1954 | High | Poor |
| Halls Lake Dam Preble County | 13 | 1935 | Low | Poor |
| Halley Pond Dam Morgan County | 32 | 1959 | Significant | Poor |
| Gund Pond No. 2 Dam Summit County | 26 | 1970 | Low | Poor |
| Gund Pond No. 1 Dam Summit County | 36 | 1970 | Low | Poor |
| Guilford Lake Dam Columbiana County | 35 | 1933 | High | Poor |
| Grubb Lake Dam Licking County | 21 | 1974 | Low | Poor |
| Grenke Lake Dam Ashtabula County | 16 | — | Low | Poor |
| Greenwich Reservoir Dam Huron County | 20 | 1921 | High | Poor |
| Greenbriar Lake Dam Butler County | 38 | 1958 | Low | Poor |
| 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 |
| Golden Bear Reservoir Dam Delaware County | 26 | 1972 | Low | Poor |
| Glen Willow Lake Dam Clermont County | 18 | — | Significant | Poor |
| Glass Rock Lake Dam Perry County | 54 | — | High | Poor |
| Giel Lake Dam Geauga County | 15 | — | Significant | Poor |
| Georgetown Upper Pond No. 2 Dam Harrison County | 22 | 1978 | Low | Poor |
| Georgetown Upground Reservoir Brown County | 27 | 1959 | Significant | Poor |
| General Motors Secondary Lagoon Defiance County | 29 | — | Significant | Poor |
| Galley Hill Lake Dam Clermont County | 63 | 1960 | High | Poor |
| Gallery Lake Dam Medina County | 12 | — | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.