Alcyon Lake Dam
Alcyon Lake Dam is an earth dam located in Gloucester County, New Jersey, built in 1943. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Alcyon Lake Dam
The primary purpose of Alcyon Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Borough Of Pitman (local government). It impounds the Chestnut Branch Mantua Creek near Pitman.
The dam stands 12 feet tall and stretches 480 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1943, the structure is well-established, with more than 75 years of service.
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 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 11/13/2024.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Jersey |
| County | Gloucester |
| Nearest City | Pitman |
| River/Stream | Chestnut Branch Mantua Creek |
| Coordinates | 39.73210, -75.14173 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 480 ft |
| Year Completed | 1943 (83 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 66 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 632 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Borough of Pitman |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/13/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00427 |
| Federal ID | NJ00427 |
| More Info | State Dam Safety Program |