David Mine Sedimentation Pond No 2
David Mine Sedimentation Pond No 2 is an earth dam located in Armstrong County, Pennsylvania, built in 1989. It carries a High hazard potential classification and has a fair condition assessment.
About David Mine Sedimentation Pond No 2
David Mine Sedimentation Pond No 2 is a dam in Armstrong, Pennsylvania. The dam is owned by Canterbury Coal Company (private). It impounds the Tr Long Run.
The dam stands 35 feet tall and stretches 270 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 69 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1989, the structure is 37 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 11/19/2020.
At 35 feet, this dam is taller than 82% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Pennsylvania dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Pennsylvania |
| County | Armstrong |
| River/Stream | Tr Long Run |
| Coordinates | 40.56806, -79.45889 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 270 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 69 acre-ft |
| Max Storage | 69 acre-ft |
| Normal Storage | 65 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | CANTERBURY COAL COMPANY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 11/19/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | PA01228 |
| Federal ID | PA01228 |
| More Info | State Dam Safety Program |