Sand Pond Dam is an earth dam located in Cheshire County, New Hampshire, built in 1920. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 349 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 Sand Pond Dam
The primary purpose of Sand Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town of Troy (local government). It impounds the Rockwood Brook near Troy.
The dam stands 10 feet tall and stretches 349 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 123 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1920, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/03/2021.
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Location
| State | New Hampshire |
| County | Cheshire |
| Nearest City | Troy |
| River/Stream | Rockwood Brook |
| Coordinates | 42.81940, -72.18410 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 349 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 35 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,100 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Troy |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/03/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NH01096 |
| Federal ID | NH01096 |
| More Info | State Dam Safety Program |