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 |