Neutralized Water Impoundment 3 is an earth dam located in Knox County, Ohio, built in 1997. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 600 ft long. 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 Neutralized Water Impoundment 3
The primary purpose of Neutralized Water Impoundment 3 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 Leister Limited. It impounds the Kokosing River - Offstream near Walhonding.
The dam stands 20 feet tall and stretches 600 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 49 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1997, the structure is 29 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/12/2024.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Ohio |
| County | Knox |
| Nearest City | Walhonding |
| River/Stream | Kokosing River - Offstream |
| Coordinates | 40.38917, -82.26278 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 600 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 49 acre-ft |
| Max Storage | 49 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 15 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | Leister Limited |
| Owner Type | Not Listed |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/12/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH02906 |
| Federal ID | OH02906 |
| More Info | State Dam Safety Program |