Rock Island
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | New York |
| County | Lewis |
| Nearest City | Port Leyden |
| River/Stream | Black River |
| Coordinates | 43.58660, -75.33910 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 180 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 429 sq mi |
| Max Discharge | 18,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Not Listed |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/19/2019 |
| Emergency Action Plan | Not Required |