Silica Pond Dam
Silica Pond Dam is a concrete dam located in Cheshire County, New Hampshire, built in 1930. It carries a Significant hazard potential classification and has a poor condition assessment.
About Silica Pond Dam
The primary purpose of Silica 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 Unnamed Brook near Troy.
The dam stands 9 feet tall and stretches 150 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 29 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. 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 | Unnamed Brook |
| Coordinates | 42.82270, -72.18690 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 150 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 29 acre-ft |
| Max Storage | 29 acre-ft |
| Normal Storage | 4 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 675 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | TOWN OF TROY |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 06/03/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NH01098 |
| Federal ID | NH01098 |
| More Info | State Dam Safety Program |