Helmetta Dam
Helmetta Dam is an earth dam located in Middlesex County, New Jersey. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Helmetta Dam
The primary purpose of Helmetta 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 Middlesex, Engineering Department (local government). It impounds the Manalapan Brook.
The dam stands 7 feet tall and stretches 2,000 feet across, creates a reservoir covering 50 acres, has a storage capacity of 64 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 09/09/2024.
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Location
| State | New Jersey |
| County | Middlesex |
| River/Stream | Manalapan Brook |
| Coordinates | 40.37697, -74.42775 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 2,000 ft |
Storage & Hydraulics
| NID Storage | 64 acre-ft |
| Normal Storage | 64 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 41 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | County of Middlesex, Engineering Department |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/09/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00794 |
| Federal ID | NJ00794 |
| More Info | State Dam Safety Program |