Dams in Mercer County, Ohio
7Total Dams
2High Hazard
4Significant
Dam Safety in Mercer County, Ohio
Mercer County has 7 dams tracked in the National Inventory of Dams. Of these, 2 are classified as high hazard — meaning failure would probably cause loss of human life. Another 4 carry a significant hazard classification. Currently, 1 dams have a condition assessment of poor or unsatisfactory.
The average dam in Mercer County is 62 years old. The most common purpose is tailings. The tallest dam is Upper Wabash Structure No. 3 Dam at 28 ft.
Explore more: Oldest dams in Ohio · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Upper Wabash Structure No. 3 Dam | High | Satisfactory | 28 | Flood Risk Reduction | 1963 |
| Grand Lake St. Marys - West Embankment | High | Poor | 20 | Recreation | 1841 |
| St. Henry Wwt Lagoon | Significant | Satisfactory | 27 | Tailings | 1988 |
| Coldwater Wastewater Treatment Dam | Significant | Satisfactory | 26 | Tailings | 1991 |
| Montezuma Club Island Wwt Lagoon Cell 4 | Significant | Fair | 17 | Debris Control | 2012 |
| Montezuma/club Island Wwt Lagoons | Significant | Fair | 17 | Tailings | 1985 |
| Upper Wabash Structure No. 2 | Low | Fair | 17 | Flood Risk Reduction | 1963 |