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 1–25 of 397
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Zimber Ditch Detention Basin B Summit County | 17 | 2007 | High | Satisfactory |
| Zanesville State Nursery Lake Dam Muskingum County | 32 | — | High | Fair |
| Youngstown Upground Reservoir Mahoning County | 29 | 1929 | High | Fair |
| Wright Farm West Detention Basin Dam Hamilton County | 26 | 1996 | High | Satisfactory |
| Woodsfield Reservoir Dam No. 3 Monroe County | 56 | 1992 | High | Poor |
| Wolf Run Lake Dam Noble County | 76 | 1966 | High | Satisfactory |
| Wolfden Lake Dam Scioto County | 27 | 1936 | High | Fair |
| Wolf Creek Dam Summit County | 43 | 1926 | High | Poor |
| Wilmington Upground Reservoir No. 2 Clinton County | 31 | 1963 | High | Satisfactory |
| Wilmington Upground Reservoir No. 1 Clinton County | 19 | 1945 | High | Satisfactory |
| Wills Creek Dam Coshocton County | 87 | 1936 | High | Not Available |
| Willowbrook Lake Dam Clermont County | 23 | 1975 | High | Fair |
| Willoway Upground No. 5 Dam Lorain County | 12 | 1999 | High | Satisfactory |
| Williams Reservoir Allen County | 53 | 2012 | High | Satisfactory |
| William H. Harsha Dam Clermont County | 205 | 1973 | High | Not Available |
| Willard City Upground Reservoir Huron County | 65 | 1971 | High | Fair |
| White Turkey Lake Dam Ross County | 42 | 1968 | High | Fair |
| West Reservoir Dam Summit County | 22 | 1840 | High | Satisfactory |
| West Fork of Mill Creek Dam Hamilton County | 106 | 1952 | High | Not Available |
| Westerville Reservoir Dam Delaware County | 47 | 1960 | High | Satisfactory |
| Wellston Reservoir Dam Jackson County | 41 | 1920 | High | Poor |
| Wellington Upground Reservoir Lorain County | 35 | 1972 | High | Fair |
| Wauseon Upground Reservoir No. 2 Fulton County | 26 | 1934 | High | Fair |
| Washington Court House Ug No. 1 Dam Fayette County | 21 | 1956 | High | Fair |
| Waller Lake Dam Lawrence County | 24 | 1955 | High | Poor |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.