Bog Pond Dam is a concrete dam located in Merrimack County, New Hampshire, built in 1870. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 17 ft17 ft tall and 160 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 Bog Pond Dam
The primary purpose of Bog Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ragged Mountain Resort (private). It impounds the Bog Brook near Danbury.
The dam stands 17 feet tall and stretches 160 feet across, creates a reservoir covering 99 acres, has a maximum storage capacity of 1,000 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/30/2022.
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Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Danbury |
| River/Stream | Bog Brook |
| Coordinates | 43.51710, -71.84149 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 160 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 1,000 acre-ft |
| Max Storage | 1,000 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 99 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 2,950 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ragged Mountain Resort |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/30/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00402 |
| Federal ID | NH00402 |
| More Info | State Dam Safety Program |