Stony Brook #3 (rosedale Lake) Dam is an earth dam located in Mercer County, New Jersey. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 28 ft28 ft tall and 1,900 ft long, taller than 62% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Stony Brook #3 (rosedale Lake) Dam
The primary purpose of Stony Brook #3 (rosedale Lake) Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by County of Mercer Park Commission (local government). It impounds the Stony Brook-tr.
The dam stands 28 feet tall and stretches 1,900 feet across, creates a reservoir covering 30 acres, has a storage capacity of 182 acre-feet, and collects water from a drainage area of 1 square miles.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/15/2024.
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Location
| State | New Jersey |
| County | Mercer |
| River/Stream | Stony Brook-tr |
| Coordinates | 40.33278, -74.75450 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 1,900 ft |
Storage & Hydraulics
| NID Storage | 182 acre-ft |
| Normal Storage | 182 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | County of Mercer Park Commission |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/15/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NJ00389 |
| Federal ID | NJ00389 |
| More Info | State Dam Safety Program |