Dunmore No 7 Reservoir is a gravity dam located in Lackawanna County, Pennsylvania, built in 1872. It carries a High hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 45 ft45 ft tall and 340 ft long, taller than 90% 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 concrete gravity section and the water level is illustrative.
About Dunmore No 7 Reservoir
The primary purpose of Dunmore No 7 Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Pa American Water Company (private). It impounds the Roaring Brook.
The dam stands 45 feet tall and stretches 340 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 570 acre-feet, and collects water from a drainage area of 50 square miles. Completed in 1872, the structure is one of the older dams in the region, with over a century and a half of service.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 06/16/2020.
At 45 feet, this dam is taller than 90% 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 | Lackawanna |
| River/Stream | Roaring Brook |
| Coordinates | 41.41306, -75.60667 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 340 ft |
| Year Completed | 1872 (154 years old) |
Storage & Hydraulics
| NID Storage | 570 acre-ft |
| Max Storage | 570 acre-ft |
| Normal Storage | 310 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 50 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Pa American Water Company |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 06/16/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00363 |
| Federal ID | PA00363 |
| More Info | State Dam Safety Program |