Midfield Sedimentation Pond
Midfield Sedimentation Pond is an earth dam located in Allegheny County, Pennsylvania, built in 1988. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Midfield Sedimentation Pond
The primary purpose of Midfield Sedimentation Pond is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Allegheny County Airport Authority (local government). It impounds the Tr Montour Run.
The dam stands 40 feet tall and stretches 360 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 374 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1988, the structure is 38 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 11/08/2020.
At 40 feet, this dam is taller than 87% 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 | Allegheny |
| River/Stream | Tr Montour Run |
| Coordinates | 40.48139, -80.24500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 360 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 374 acre-ft |
| Max Storage | 374 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | ALLEGHENY COUNTY AIRPORT AUTHORITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/08/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01254 |
| Federal ID | PA01254 |
| More Info | State Dam Safety Program |