Woolman Lake Dam
Woolman Lake Dam is an earth dam located in Burlington County, New Jersey. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Woolman Lake Dam
The primary purpose of Woolman 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 Mt. Holly (local government). It impounds the Buttonwood Run near Mount Holly.
The dam stands 5 feet tall and stretches 175 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 17 acre-feet, and collects water from a drainage area of 1 square miles.
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 05/02/2025.
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Location
| State | New Jersey |
| County | Burlington |
| Nearest City | Mount Holly |
| River/Stream | Buttonwood Run |
| Coordinates | 39.99567, -74.78045 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 5 ft |
| Dam Height | 5 ft |
| Dam Length | 175 ft |
Storage & Hydraulics
| NID Storage | 17 acre-ft |
| Max Storage | 17 acre-ft |
| Normal Storage | 11 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 39 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Township of Mt. Holly |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/02/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00909 |
| Federal ID | NJ00909 |
| More Info | State Dam Safety Program |