| Dam Name | Wanapum |
| Incident Date | 1/12/2017 |
| Country | United States |
| State/Province | Washington |
| Dam Height (m) | 28.3 |
| Uncontrolled Release of the Reservoir | No |
| Dam Type | Concrete; Rockfill; Gravity |
| Detailed Dam Type | |
| Incident Type | Gate Failure |
| Incident Description | Spillway gate mechanical interference at trunnion housing / yoke assembly during closure operation. Gates 6 and 7 are listed as last to operate until remedial measures are complete; one gate at a time will be behind the floating bulkhead for repair. |
| High Level Failure Mode | |
| Lessons Learned | |
| Initiating Event | Equipment Failure |
| Initiating Event Description | |
| Structures/Components | Gate |
| Failure Mode Description | |
| Emergency Action Plan Implemented | Unknown |
| Consequences | Consequence Data Unavailable |
| Geographic Coordinates - Decimal Degrees | 46.8731, -119.9703 |
| Normal Reservoir Storage (m3): | 727,754,294.6 |
| Crest Elevation (m) |