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 576–600 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mccomb Upground Reservoir No. 2 Hancock County | 32 | 1979 | High | Fair |
| Mccomb Upground Reservoir No. 1 Hancock County | 17 | 1953 | High | Fair |
| Mcclure Wwt Lagoon Henry County | 9 | 1997 | Significant | Satisfactory |
| Mcclure Lake Dam Lawrence County | 36 | 1966 | Low | Fair |
| Mcclintock Lake Dam Allen County | 14 | 1982 | Significant | Poor |
| Mcclain Lake Dam Licking County | 40 | 2018 | Low | Satisfactory |
| Mcbride Lake Dam Scioto County | 21 | — | Significant | Fair |
| Mayfield Lake Dam Mahoning County | 9 | — | Undetermined | Not Rated |
| Mathews Pond Dam Noble County | 58 | 1969 | Significant | Fair |
| Marysville Upground Reservoir Union County | 48 | 2009 | High | Satisfactory |
| Marsh Lake Dam Tuscarawas County | 43 | 1955 | Significant | Fair |
| Marshfield Lake Dam Cuyahoga County | 15 | 1940 | Significant | Poor |
| Marko Lake Dam Stark County | 22 | 1962 | Significant | Poor |
| 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. 5 Athens County | 29 | 1970 | Significant | Satisfactory |
| 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 |
| Maplewood Lake Dam Meigs County | 19 | 1950 | Significant | Poor |
| Maple Valley Lake Dam Tuscarawas County | 27 | 1970 | Significant | Poor |
| Manfull Lake Dam Columbiana County | 18 | 1951 | Significant | Poor |
| Mallard Cove Lake Dam Hamilton County | 36 | 1984 | Significant | Fair |
| Malek Lake Dam Medina County | 17 | 1967 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.