Coldwater Wastewater Treatment Dam is an earth dam located in Mercer County, Ohio, built in 1991. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 5,400 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Coldwater Wastewater Treatment Dam
The primary purpose of Coldwater Wastewater Treatment Dam is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Village of Coldwater (local government). It impounds the Hardin Creek near Coldwater.
The dam stands 26 feet tall and stretches 5,400 feet across, has a maximum storage capacity of 674 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1991, the structure is 35 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 12/04/2024.
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Location
| State | Ohio |
| County | Mercer |
| Nearest City | Coldwater |
| River/Stream | Hardin Creek |
| Coordinates | 40.49333, -84.62000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 5,400 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 674 acre-ft |
| Max Storage | 674 acre-ft |
| Drainage Area | 0 sq mi |
| Max Discharge | 100 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | Village of Coldwater |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/04/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH02743 |
| Federal ID | OH02743 |
| More Info | State Dam Safety Program |