Allegheny Storage
Allegheny Storage is an earth dam located in Blair County, Pennsylvania, built in 1905. It carries a High hazard potential classification and has a fair condition assessment.
About Allegheny Storage
The primary purpose of Allegheny Storage 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 Altoona Water Authority (local government). It impounds the Mill Run.
The dam stands 31 feet tall and stretches 1,500 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 234 acre-feet, and collects water from a drainage area of 6 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 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 08/12/2020.
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 | Blair |
| River/Stream | Mill Run |
| Coordinates | 40.50778, -78.43778 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 1,500 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 234 acre-ft |
| Max Storage | 234 acre-ft |
| Normal Storage | 184 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 6 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | ALTOONA WATER AUTHORITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 08/12/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00526 |
| Federal ID | PA00526 |
| More Info | State Dam Safety Program |