Apshawa Main Dam is a concrete dam located in Passaic County, New Jersey, built in 1912. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 500 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Apshawa Main Dam
The primary purpose of Apshawa Main 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 Passaic (local government). It impounds the Apshawa Brook.
The dam stands 22 feet tall and stretches 500 feet across, creates a reservoir covering 45 acres, has a storage capacity of 850 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1912, 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 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 03/20/2024.
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Location
| State | New Jersey |
| County | Passaic |
| River/Stream | Apshawa Brook |
| Coordinates | 41.02753, -74.38535 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 500 ft |
| Year Completed | 1912 (114 years old) |
Storage & Hydraulics
| NID Storage | 850 acre-ft |
| Normal Storage | 850 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 155 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | County of Passaic |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/20/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00318 |
| Federal ID | NJ00318 |
| More Info | State Dam Safety Program |