Grenloch Lake Dam is an earth dam located in Gloucester County, New Jersey, built in 1907. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 21 ft21 ft tall and 250 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 Grenloch Lake Dam
The primary purpose of Grenloch 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 Washington (local government). It impounds the South Branch Timber Creek.
The dam stands 21 feet tall and stretches 250 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 272 acre-feet, and collects water from a drainage area of 14 square miles. Completed in 1907, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 03/04/2022.
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Location
| State | New Jersey |
| County | Gloucester |
| River/Stream | South Branch Timber Creek |
| Coordinates | 39.78302, -75.05837 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 250 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 272 acre-ft |
| Max Storage | 272 acre-ft |
| Normal Storage | 92 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 14 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Township of Washington |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 03/04/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00402 |
| Federal ID | NJ00402 |
| More Info | State Dam Safety Program |