Alloway Lake Dam is an earth dam located in Salem County, New Jersey, built in 1949. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 700 ft long. 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 Alloway Lake Dam
The primary purpose of Alloway Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Township of Alloway (local government). It impounds the Alloway Creek.
The dam stands 20 feet tall and stretches 700 feet across, creates a reservoir covering 108 acres, has a storage capacity of 490 acre-feet, and collects water from a drainage area of 21 square miles. Completed in 1949, 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 03/30/2023.
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Location
| State | New Jersey |
| County | Salem |
| River/Stream | Alloway Creek |
| Coordinates | 39.56518, -75.36032 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 700 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 490 acre-ft |
| Normal Storage | 490 acre-ft |
| Surface Area | 108 acres |
| Drainage Area | 21 sq mi |
| Max Discharge | 3,040 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Township of Alloway |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/30/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00038 |
| Federal ID | NJ00038 |
| More Info | State Dam Safety Program |