Silver Lake Dam is an earth dam located in Cheshire County, New Hampshire, built in 1924. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 80 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 Silver Lake Dam
The primary purpose of Silver Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nh Des Water Division (state). It impounds the Minnewawa Brook near Harrisville.
The dam stands 12 feet tall and stretches 80 feet across, creates a reservoir covering 341 acres, has a maximum storage capacity of 4,070 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1924, 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 11/26/2019.
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Location
| State | New Hampshire |
| County | Cheshire |
| Nearest City | Harrisville |
| River/Stream | Minnewawa Brook |
| Coordinates | 42.94880, -72.13270 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 80 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 4,070 acre-ft |
| Max Storage | 4,070 acre-ft |
| Normal Storage | 2,870 acre-ft |
| Surface Area | 341 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 228 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nh Des Water Division |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/26/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00062 |
| Federal ID | NH00062 |
| More Info | State Dam Safety Program |