Dalton Run
Dalton Run is an earth dam located in Somerset County, Pennsylvania, built in 1905. It carries a High hazard potential classification and has a poor condition assessment.
About Dalton Run
The primary purpose of Dalton Run 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 Greater Johnstown Water Authority (local government). It impounds the Dalton Run.
The dam stands 61 feet tall and stretches 600 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 390 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1905, 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 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 03/25/2021.
At 61 feet, this dam is taller than 95% of all dams in the United States.
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 | Somerset |
| River/Stream | Dalton Run |
| Coordinates | 40.28000, -78.98694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 61 ft |
| Dam Height | 61 ft |
| Dam Length | 600 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 390 acre-ft |
| Max Storage | 390 acre-ft |
| Normal Storage | 276 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 3 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | GREATER JOHNSTOWN WATER AUTHORITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 03/25/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00232 |
| Federal ID | PA00232 |
| More Info | State Dam Safety Program |