Keswick Grove Lower Dam
Keswick Grove Lower Dam is an earth dam located in Ocean County, New Jersey, built in 1898. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Keswick Grove Lower Dam
The primary purpose of Keswick Grove Lower Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by America's Keswick (private). It impounds the Wrangel Brook near Keswick Grove.
The dam stands 8 feet tall and stretches 200 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 106 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1898, 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 03/19/2025.
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Location
| State | New Jersey |
| County | Ocean |
| Nearest City | Keswick Grove |
| River/Stream | Wrangel Brook |
| Coordinates | 39.94828, -74.33888 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 200 ft |
| Year Completed | 1898 (128 years old) |
Storage & Hydraulics
| NID Storage | 106 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 29 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | America's Keswick |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/19/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NJ00048 |
| Federal ID | NJ00048 |
| More Info | State Dam Safety Program |