Gropps Lake Dam
Gropps Lake Dam is an earth dam located in Mercer County, New Jersey, built in 1900. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Gropps Lake Dam
The primary purpose of Gropps Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Township Of Hamilton (local government). It impounds the Back Creek near Bordentown.
The dam stands 25 feet tall and stretches 485 feet across, creates a reservoir covering 41 acres, has a maximum storage capacity of 549 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1900, the structure is over a century 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 09/22/2023.
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Location
| State | New Jersey |
| County | Mercer |
| Nearest City | Bordentown |
| River/Stream | Back Creek |
| Coordinates | 40.18665, -74.69022 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 485 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 549 acre-ft |
| Max Storage | 549 acre-ft |
| Normal Storage | 211 acre-ft |
| Surface Area | 41 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,900 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Township of Hamilton |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/22/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NJ00235 |
| Federal ID | NJ00235 |
| More Info | State Dam Safety Program |