Duffys Run is a gravity dam located in Luzerne County, Pennsylvania, built in 1966. It carries a High hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 14 ft14 ft tall and 81 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Duffys Run
The primary purpose of Duffys Run 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 Borough of Plymouth (local government). It impounds the Duffy Run.
The dam stands 14 feet tall and stretches 81 feet across, has a maximum storage capacity of 0 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, the structure is well into its service life at over 50 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/26/2020.
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 | Luzerne |
| River/Stream | Duffy Run |
| Coordinates | 41.24389, -75.95889 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 81 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 0 acre-ft |
| Max Storage | 0 acre-ft |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Borough of Plymouth |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 08/26/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01353 |
| Federal ID | PA01353 |
| More Info | State Dam Safety Program |