Stony Brook #2 (willow Lake) Dam is an earth dam located in Mercer County, New Jersey, built in 1959. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 405 ft long. 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 #2 (willow Lake) Dam
The primary purpose of Stony Brook #2 (willow Lake) 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 Mercer Park Commission (local government). It impounds the Stony Brook-tr near Princeton.
The dam stands 15 feet tall and stretches 405 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 65 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.
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 |
| Nearest City | Princeton |
| River/Stream | Stony Brook-tr |
| Coordinates | 40.33453, -74.74595 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 405 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 16 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,620 cfs |
Ownership & Safety
| Purpose | Recreation |
| 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 | NJ00866 |
| Federal ID | NJ00866 |
| More Info | State Dam Safety Program |