| NPDP ID | NH00001 |
| Dam Name | Blackwater Dam |
| Other Dam Name | Dry Reservoir |
| Year of Completion | 1941 |
| State ID | 01720 |
| Is in NID | Yes |
| Is in Operation | Yes |
| Longitude | -71.72 |
| Latitude | 43.31 |
| State | NH |
| County | Merrimack |
| Town Section | |
| River | Blackwater River |
| Owner Name | Cenae |
| Owner Type | Federal |
| Dam Types | Earth Gravity |
| NID Core | Core; Earth; Known; |
| Crest Length | 1150 |
| Dam NID Height | 69 |
| Structral Height | 69 |
| Hydraulic Height | 64 |
| Dam Volume | 299000 |
| NID Type | Rock & Soil |
| Max Storage Capacity | 93400 |
| Normal Storage Capacity | 1 |
| NID Storage Capacity | 93400 |
| Surface Area | 1 |
| Drainage Area | 128 |
| Primary Purpose | Flood Control and Storm Water Management |
| Secondary Purpose | None |
| Hazard Classification | High |
| EAP | Yes |
| Is State Regulated | No |
| State Regulatory Agency | NEW HAMPSHIRE WRD |
| Federal Regulatory Agency | CE |