Buttonwood Lake Dam
Buttonwood Lake Dam is an earth dam located in Burlington County, New Jersey, built in 1950. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Buttonwood Lake Dam
The primary purpose of Buttonwood 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 Mount Holly (local government). It impounds the Rancocas Creek-tr near Mount Holly.
The dam stands 8 feet tall and stretches 175 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 8 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1950, 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 02/28/2025.
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Location
| State | New Jersey |
| County | Burlington |
| Nearest City | Mount Holly |
| River/Stream | Rancocas Creek-tr |
| Coordinates | 39.99570, -74.77755 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 175 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 8 acre-ft |
| Max Storage | 8 acre-ft |
| Normal Storage | 5 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 40 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Township of Mount Holly |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/28/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ01052 |
| Federal ID | NJ01052 |
| More Info | State Dam Safety Program |