Almonesson Lake Dam
Almonesson Lake Dam is an earth dam located in Gloucester County, New Jersey, built in 1926. It carries a Significant hazard potential classification and has a poor condition assessment.
About Almonesson Lake Dam
The primary purpose of Almonesson Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by County Of Gloucester (local government). It impounds the Almonesson Creek near Almonesson.
The dam stands 24 feet tall and stretches 300 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 257 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1926, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/08/2025.
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Location
| State | New Jersey |
| County | Gloucester |
| Nearest City | Almonesson |
| River/Stream | Almonesson Creek |
| Coordinates | 39.81803, -75.09653 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 300 ft |
| Year Completed | 1926 (100 years old) |
Storage & Hydraulics
| NID Storage | 257 acre-ft |
| Max Storage | 257 acre-ft |
| Normal Storage | 125 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 810 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | County of Gloucester |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/08/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NJ00401 |
| Federal ID | NJ00401 |
| More Info | State Dam Safety Program |