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 151–175 of 397
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mont-Mere Lake Dam Geauga County | 28 | 1969 | High | Fair |
| Monroe Lake Dam Monroe County | 58 | 1956 | High | Fair |
| Mohicanville Dam Ashland County | 46 | 1937 | High | Not Available |
| Mohawk Dam Coshocton County | 111 | 1937 | High | Not Available |
| Mogadore Reservoir Dam Portage County | 36 | 1938 | High | Poor |
| Mineral Springs Resort Lake Dam Adams County | 67 | 1973 | High | Fair |
| Mineral Ridge Dam Trumbull County | 60 | 1932 | High | Poor |
| Michael J. Kirwan Dam Portage County | 83 | 1966 | High | Not Available |
| Metzger Upground Reservoir Allen County | 45 | 1946 | High | Fair |
| Meigs-Phillips I No. 1 Dam Belmont County | 58 | 1987 | High | Fair |
| Meigs Mine No. 1 Slurry Impoundment Meigs County | 131 | — | High | Not Rated |
| Mckelvey Lake Dam Mahoning County | 77 | 1926 | High | Fair |
| Mccomb Upground Reservoir No. 2 Hancock County | 32 | 1979 | High | Fair |
| Mccomb Upground Reservoir No. 1 Hancock County | 17 | 1953 | High | Fair |
| Marysville Upground Reservoir Union County | 48 | 2009 | High | Satisfactory |
| Marge Schott Lake Dam Clermont County | 140 | 2000 | High | Satisfactory |
| Margaret Creek Structure No. 6 Athens County | 42 | 1967 | High | Poor |
| Margaret Creek Structure No. 4 Athens County | 34 | 1971 | High | Fair |
| Margaret Creek Structure No. 2 Athens County | 60 | 1970 | High | Fair |
| Margaret Creek Structure No. 1 Athens County | 32 | 1972 | High | Satisfactory |
| Marathon Brine Pond Dam Stark County | 23 | 2008 | High | Satisfactory |
| Luburgh Lake Dam Guernsey County | 51 | 1963 | High | Satisfactory |
| Loyal Oak Lake Dam Summit County | 31 | 1930 | High | Satisfactory |
| Lower Shaker Lake Dam Cuyahoga County | 17 | 1830 | High | Poor |
| Lower Jeffco Lake Dam Ashtabula County | 17 | 1963 | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.