EIGHTMILE LAKE OUTLET DAM - WA00228-3248
| Incident ID | WA00228-3248 |
| Dam Name | EIGHTMILE LAKE OUTLET DAM |
| Downstream Hazard Potential | H |
| State | WA |
| Incident Date | 01/01/2019 |
| Incident Type | Non-failure |
| Incident Driver | Deterioration Or Poor Condition |
| Incident Mechanism 1 | Spillway Pipe Failure |
| Incident Mechanism 2 | Insufficient Spillway Capacity |
| Incident Mechanism 3 | Reservoir Overfilling |
| Incident Description | No failure but EAP implemented for deteriorating 90 year old dam as precaution for high spring runoff. Wildfire burned much of watershed the previous fall and low-level outlet was not working. Located in wilderness area with no winter access or remote monitoring. |
| Named Hydrologic Event | |
| EAP Enacted (Y/N) due to Incident | Yes |
| Fatalities (Number) | 0 |
| Number of People Evacuated | 0 |
| Number of Habitable Structures Evacuated | 0 |
| Number of Habitable Structures Flooded | 0 |
| Other Infrastructure Impacts | None |
| Economic Damages (in $) | None |
| Volume released at failure (ac-ft) | |
| Response | Public alert and meetings. Local and State EM staff engaged. Twice weekly recons by small aircraft/helicopters. Installed remote monitoring, re-shaped and armoroed crest, reapired low level outlet. |
| Additional Remarks or Updates | temporary measures in place. Dam owner applying for rehabilitation of the dam. Located on USFS property. |
| Incident Time | |
| Incident Duration | 10 Months |
| Incident Report Produced | No |
| Information Sources | WA DOE |
| Owner Type | U |
| Dam Type | ERRE |
| Primary Purpose(s) | IR |
| EAP | Y |
| Year Completed | 1933 |
| Year Modified | 0 |
| Dam Height | 22 ft |
| Max Storage (ac-ft) | 1610 ac-ft |
| Surface Area (acres) | 65 acres |
| River Name | EIGHTMILE CREEK |
| Latitude | 47.5205 |
| Longitude | -120.858 |
| Regulatory Agency(ies) | WASHINGTON, DEPT OF ECOLOGY |
| NID Number | WA00228 |
| Attachments |
