Graterford Sewage Lagoons is an earth dam located in Montgomery County, Pennsylvania, built in 1986. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 35 ft35 ft tall and 250 ft long, taller than 80% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Graterford Sewage Lagoons
Graterford Sewage Lagoons is a dam in Montgomery, Pennsylvania. The dam is owned by Pa Dept. of Corrections (state). It impounds the Wtrshd Perkiomen Creek.
The dam stands 35 feet tall and stretches 250 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 155 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1986, the structure is 40 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 12/09/2011. That was over 14 years ago.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Pennsylvania |
| County | Montgomery |
| River/Stream | Wtrshd Perkiomen Creek |
| Coordinates | 40.22722, -75.43583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 250 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 155 acre-ft |
| Max Storage | 155 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Pa Dept. of Corrections |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 12/09/2011 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA01242 |
| Federal ID | PA01242 |
| More Info | State Dam Safety Program |