Hargate Dam is a concrete dam located in Merrimack County, New Hampshire, built in 1835. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 14 ft14 ft tall and 119 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Hargate Dam
The primary purpose of Hargate Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by St Pauls School (private). It impounds the Turkey River near Concord.
The dam stands 14 feet tall and stretches 119 feet across, creates a reservoir covering 46 acres, has a maximum storage capacity of 221 acre-feet, and collects water from a drainage area of 30 square miles. Completed in 1835, the structure is one of the older dams in the region, with over a century and a half of service.
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 11/04/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Concord |
| River/Stream | Turkey River |
| Coordinates | 43.19274, -71.57693 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 119 ft |
| Year Completed | 1835 (191 years old) |
Storage & Hydraulics
| NID Storage | 221 acre-ft |
| Max Storage | 221 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 46 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 1,957 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | St Pauls School |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/04/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00484 |
| Federal ID | NH00484 |
| More Info | State Dam Safety Program |