|
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 |
|
