Upper Silvis
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | Alaska |
| County | Ketchikan Gateway Borough |
| Nearest City | None |
| River/Stream | Beaver Falls Creek, George Inl |
| Coordinates | 55.37996, -131.51893 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 60 ft |
| Dam Height | 60 ft |
| Dam Length | 135 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 38,000 acre-ft |
| Max Storage | 38,000 acre-ft |
| Normal Storage | 22,000 acre-ft |
| Surface Area | 300 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 6,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Ketchikan |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/07/2019 |
| Emergency Action Plan | Not Required |