Holt Pond Dam
Holt Pond Dam is a concrete dam located in Hillsborough, New Hampshire, built in 1890. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Holt Pond Dam
The primary purpose of Holt Pond Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Pennichuck Water Works Inc (private). It impounds the Pennichuck Brook near Nashua.
The dam stands 13 feet tall and stretches 310 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 333 acre-feet, and collects water from a drainage area of 21 square miles. Completed in 1890, 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 11/20/2017.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Nashua |
| River/Stream | Pennichuck Brook |
| Coordinates | 42.80020, -71.51610 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 310 ft |
| Year Completed | 1890 (136 years old) |
Storage & Hydraulics
| NID Storage | 333 acre-ft |
| Max Storage | 333 acre-ft |
| Normal Storage | 61 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 21 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | PENNICHUCK WATER WORKS INC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/20/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00327 |
| Federal ID | NH00327 |
| More Info | State Dam Safety Program |