EIGHTMILE LAKE OUTLET DAM - WA00228-3248
Dam Name: EIGHTMILE LAKE OUTLET DAM
State: WA
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 01/01/2019
Incident Driver: Deterioration or Poor Condition
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2Insufficient Spillway Capacity
Incident Mechanism 3Reservoir Overfilling
Incident IDWA00228-3248
Incident DescriptionNo 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 IncidentYes
Fatalities (Number)0
Number of People Evacuated0
Number of Habitable Structures Evacuated0
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsNone
Economic Damages (in $)None
ResponsePublic 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.
Volume released at failure (ac-ft)
Additional Remarks or Updatestemporary measures in place. Dam owner applying for rehabilitation of the dam. Located on USFS property.
Owner TypeU
Dam TypeERRE
Primary Purpose(s)IR
EAPY
Dam Height22 ft
Max Storage (ac-ft)1610.00
Surface Area (acres)65.00
Year Completed1933
NID NumberWA00228
River NameEIGHTMILE CREEK
Latitude47.5205
Longitude-120.858
Year Modified
Regulatory Agency(ies)WASHINGTON, DEPT OF ECOLOGY
Incident Time
Incident Duration10 Months
Incident Report ProducedNo
Information SourcesWA DOE
