Mine No 84 - Pond 7 is an earth dam located in Washington County, Pennsylvania, built in 1980. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 36 ft36 ft tall and 275 ft long, taller than 82% 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 Mine No 84 - Pond 7
The primary purpose of Mine No 84 - Pond 7 is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Eighty-four Mining Company (private). It impounds the Tr Center Branch Pigeon Creek.
The dam stands 36 feet tall and stretches 275 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 34 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1980, the structure is 46 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 09/29/2017.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Washington |
| River/Stream | Tr Center Branch Pigeon Creek |
| Coordinates | 40.13972, -80.05028 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 275 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 34 acre-ft |
| Max Storage | 34 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Eighty-four Mining Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/29/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01243 |
| Federal ID | PA01243 |
| More Info | State Dam Safety Program |