Frog Pond Dam is an earth dam located in Hillsborough, New Hampshire, built in 1916. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 190 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 Frog Pond Dam
The primary purpose of Frog Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Wilton Conservation Commission (local government). It impounds the Tannery Brook near Wilton.
The dam stands 15 feet tall and stretches 190 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 16 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1916, 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. The most recent inspection on record was 11/03/2021.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Wilton |
| River/Stream | Tannery Brook |
| Coordinates | 42.84500, -71.72970 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 190 ft |
| Year Completed | 1916 (110 years old) |
Storage & Hydraulics
| NID Storage | 16 acre-ft |
| Max Storage | 16 acre-ft |
| Normal Storage | 4 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 123 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Wilton Conservation Commission |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/03/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NH00911 |
| Federal ID | NH00911 |
| More Info | State Dam Safety Program |