Rock Island
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Washington |
| County | Douglas |
| Nearest City | Vantage, WA |
| River/Stream | Columbia River |
| Coordinates | 47.34236, -120.09432 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 71 ft |
| Dam Height | 71 ft |
| Dam Length | 3,108 ft |
| Year Completed | 1932 (94 years old) |
Storage & Hydraulics
| NID Storage | 131,000 acre-ft |
| Max Storage | 131,000 acre-ft |
| Normal Storage | 113,700 acre-ft |
| Surface Area | 3,120 acres |
| Drainage Area | 89,400 sq mi |
| Max Discharge | 920,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PUD #1 of Chelan County, WA |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2022 |
| Emergency Action Plan | Yes |