Brooklyn
Significant HazardUnsatisfactory ConditionEmergency Action Plan: Yes
Location
| State | New Hampshire |
| County | Coos |
| Nearest City | Groveton |
| River/Stream | Upper Ammonoosuc River |
| Coordinates | 44.60008, -71.50526 |
Physical Characteristics
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 275 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 240 acre-ft |
| Max Storage | 240 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 254 sq mi |
| Max Discharge | 12,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | 5440 Hydro Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 07/14/2025 |
| Emergency Action Plan | Yes |