Green Lane Reservoir
Green Lane Reservoir is a gravity dam located in Montgomery County, Pennsylvania, built in 1957. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Green Lane Reservoir
The primary purpose of Green Lane Reservoir 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 Aqua Pennsylvania, Inc. (private). It impounds the Perkiomen Creek.
The dam stands 87 feet tall and stretches 780 feet across, creates a reservoir covering 814 acres, has a maximum storage capacity of 25,114 acre-feet, and collects water from a drainage area of 71 square miles. Completed in 1957, the structure is well into its service life at over 50 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 11/09/2020.
At 87 feet, this dam is taller than 97% 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 | Montgomery |
| River/Stream | Perkiomen Creek |
| Coordinates | 40.34167, -75.47917 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 87 ft |
| Dam Height | 87 ft |
| Dam Length | 780 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 25,114 acre-ft |
| Max Storage | 25,114 acre-ft |
| Normal Storage | 13,430 acre-ft |
| Surface Area | 814 acres |
| Drainage Area | 71 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | AQUA PENNSYLVANIA, INC. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/09/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00618 |
| Federal ID | PA00618 |
| More Info | State Dam Safety Program |