Blackwater Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | WEBSTER |
| River/Stream | BLACKWATER RIVER |
| Coordinates | 43.31611, -71.72219 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 75 ft |
| Dam Height | 75 ft |
| Dam Length | 1,150 ft |
| Year Completed | 1941 (85 years old) |
Storage & Hydraulics
| NID Storage | 93,400 acre-ft |
| Max Storage | 93,400 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 128 sq mi |
| Max Discharge | 42,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - New England District |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/25/2022 |
| Emergency Action Plan | Yes |