Hamilton Lime Sludge Lagoon is an earth dam located in Butler County, Ohio, built in 1992. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 11 ft11 ft tall and 3,860 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 Hamilton Lime Sludge Lagoon
The primary purpose of Hamilton Lime Sludge Lagoon 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 City of Hamilton (local government). It impounds the Great Maimi near Hamilton.
The dam stands 11 feet tall and stretches 3,860 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 131 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1992, the structure is 34 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 05/04/2021.
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Location
| State | Ohio |
| County | Butler |
| Nearest City | Hamilton |
| River/Stream | Great Maimi |
| Coordinates | 39.35944, -84.56556 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 3,860 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 131 acre-ft |
| Max Storage | 131 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | City of Hamilton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/04/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH02806 |
| Federal ID | OH02806 |
| More Info | State Dam Safety Program |