Trout Run No 4
Trout Run No 4 is an earth dam located in Northumberland County, Pennsylvania, built in 1882. It carries a High hazard potential classification and has a fair condition assessment.
About Trout Run No 4
The primary purpose of Trout Run No 4 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 Aqua Pennsylvania, Inc. (private). It impounds the Trout Run.
The dam stands 34 feet tall and stretches 533 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 204 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1882, the structure is over a century 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 10/07/2020.
At 34 feet, this dam is taller than 80% 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 | Northumberland |
| River/Stream | Trout Run |
| Coordinates | 40.81111, -76.54694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 533 ft |
| Year Completed | 1882 (144 years old) |
Storage & Hydraulics
| NID Storage | 204 acre-ft |
| Max Storage | 204 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | AQUA PENNSYLVANIA, INC. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 10/07/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00512 |
| Federal ID | PA00512 |
| More Info | State Dam Safety Program |