Hollow Dam
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | New York |
| County | St. Lawrence |
| Nearest City | Talcville |
| River/Stream | West Branch Oswegatchie River |
| Coordinates | 44.29710, -75.33630 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 385.5 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 294 sq mi |
| Max Discharge | 10,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Ampersand Hollow Dam Hydro, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/12/2025 |
| Emergency Action Plan | Not Required |