Riverdale Dam is a concrete dam located in Hillsborough, New Hampshire. It carries a Low hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 90 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 Riverdale Dam
The primary purpose of Riverdale Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by US Army Corp of Engineers (federal). It impounds the Piscataquog River near Weare.
The dam stands 10 feet tall and stretches 90 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 153 acre-feet, and collects water from a drainage area of 47 square miles.
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. The most recent inspection on record was 10/25/2011. That was over 14 years ago.
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Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Weare |
| River/Stream | Piscataquog River |
| Coordinates | 43.03270, -71.64630 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 90 ft |
Storage & Hydraulics
| NID Storage | 153 acre-ft |
| Max Storage | 153 acre-ft |
| Normal Storage | 87 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 47 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | US Army Corp of Engineers |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/25/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH01103 |
| Federal ID | NH01103 |
| More Info | State Dam Safety Program |