Patterson Lake Dam
High HazardFair ConditionEmergency Action Plan: No
Location
| State | Washington |
| County | Okanogan |
| Nearest City | Winthrop |
| River/Stream | Rader Creek |
| Coordinates | 48.46727, -120.25114 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Length | 260 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 4,100 acre-ft |
| Max Storage | 4,100 acre-ft |
| Normal Storage | 2,500 acre-ft |
| Surface Area | 150 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 260 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Wolf Creek Reclamation District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 10/18/2021 |
| Emergency Action Plan | No |