Lake Garrison Dam
Lake Garrison Dam is an earth dam located in Gloucester County, New Jersey, built in 1924. It carries a Significant hazard potential classification and has a poor condition assessment.
About Lake Garrison Dam
The primary purpose of Lake Garrison Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Garrison Inc. (private). It impounds the Reed Branch Of Still Run near Porchtown.
The dam stands 7 feet tall and stretches 500 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 152 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1924, the structure is over a century 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 09/07/2022.
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Location
| State | New Jersey |
| County | Gloucester |
| Nearest City | Porchtown |
| River/Stream | Reed Branch Of Still Run |
| Coordinates | 39.62830, -75.12678 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 500 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 152 acre-ft |
| Max Storage | 152 acre-ft |
| Normal Storage | 89 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 41 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Garrison Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 09/07/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00778 |
| Federal ID | NJ00778 |
| More Info | State Dam Safety Program |