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 751–775 of 1,377
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Long Pond Dam Lake County | 30 | 1986 | Undetermined | Not Rated |
| Long'S Retreat Lake Dam Pike County | 28 | 1970 | High | Poor |
| Loomis Lake Dam Summit County | 29 | — | Undetermined | Not Rated |
| Lords Lake Dam Stark County | 22 | 1985 | High | Satisfactory |
| Loretta Lake Dam Lorain County | 20 | 1968 | Low | Fair |
| Lost Creek Upground Reservoir Allen County | 38 | 1917 | High | Poor |
| Lower Carter Lake Dam Summit County | 30 | — | Significant | Satisfactory |
| Lower Diehl Lake Dam Mahoning County | 27 | 1930 | Undetermined | Not Rated |
| Lower East Fork Equalization Basin Clermont County | 20 | 1992 | Significant | Satisfactory |
| Lower Jeffco Lake Dam Ashtabula County | 17 | 1963 | High | Poor |
| Lower Shaker Lake Dam Cuyahoga County | 17 | 1830 | High | Poor |
| Lower Wallace Lake Dam Columbiana County | 22 | — | Significant | Poor |
| Lower Woodsfield Reservoir Dam Monroe County | 47 | 1901 | Significant | Poor |
| Lower Woods Pond Dam Lake County | 33 | — | Undetermined | Not Rated |
| Loyal Oak Lake Dam Summit County | 31 | 1930 | High | Satisfactory |
| Luburgh Lake Dam Guernsey County | 51 | 1963 | High | Satisfactory |
| Luburgh Lake Dam No. 11 Muskingum County | 48 | 1963 | Significant | Satisfactory |
| Luburgh Lake Dam No. 12 Muskingum County | 43 | 1963 | Significant | Fair |
| Luburgh Lake Dam No. 5 Muskingum County | 23 | 1963 | Low | Fair |
| Luczek Lake Dam Cuyahoga County | 41 | 1992 | Significant | Satisfactory |
| Ludwig Dam Columbiana County | 15 | — | Low | Fair |
| Luehrs Lake Dam Ross County | 17 | — | Significant | Poor |
| Lyons Wwt Lagoon Fulton County | 8 | 2003 | Significant | Satisfactory |
| Mader Pond Dam Harrison County | 29 | 1964 | Low | Unsatisfactory |
| Madison Lake Dam Madison County | 26 | 1946 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.