Knox Road Detention
Knox Road Detention is an earth dam located in Montgomery County, Pennsylvania, built in 1979. It carries a Significant hazard potential classification and has a fair condition assessment.
About Knox Road Detention
The primary purpose of Knox Road Detention 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 Township Of Lower Merion (local government). It impounds the West Branch Indian Creek.
The dam stands 10 feet tall and stretches 480 feet across, has a maximum storage capacity of 7 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1979, the structure is 47 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. 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 03/22/2019.
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Location
| State | Pennsylvania |
| County | Montgomery |
| River/Stream | West Branch Indian Creek |
| Coordinates | 39.99833, -75.28250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 480 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 7 acre-ft |
| Max Storage | 7 acre-ft |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | TOWNSHIP OF LOWER MERION |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 03/22/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01484 |
| Federal ID | PA01484 |
| More Info | State Dam Safety Program |