Derrygally Pond Dam
Derrygally Pond Dam is a gravity dam located in Morris County, New Jersey. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Derrygally Pond Dam
The primary purpose of Derrygally Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Perrylin Mckelvie (private). It impounds the North Branch Stone Brook near Boonton.
The dam stands 8 feet tall and stretches 82 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 10 acre-feet, and collects water from a drainage area of 0 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 08/03/2024.
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Location
| State | New Jersey |
| County | Morris |
| Nearest City | Boonton |
| River/Stream | North Branch Stone Brook |
| Coordinates | 40.96875, -74.40418 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 82 ft |
Storage & Hydraulics
| NID Storage | 10 acre-ft |
| Max Storage | 10 acre-ft |
| Normal Storage | 8 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Perrylin McKelvie |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/03/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00998 |
| Federal ID | NJ00998 |
| More Info | State Dam Safety Program |