HEATER RESERVOIR #2 - OR00729-3162
Dam Name: HEATER RESERVOIR #2
State: OR
Downstream Hazard Potential: S
Incident Type: Failure
Incident Date: 11/23/2016
Incident Driver: Other
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2Sliding
Incident Mechanism 3
Incident IDOR00729-3162
Incident DescriptionDeformation of a very thin steel conduit that was very poorly encased in concrete. caused the outlet and part of the pipe and the lower 2/3 of the downstream face to move about ten feet as a slide, partly rotational, partly translational.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)0
Number of People Evacuated20
Number of Habitable Structures Evacuated0
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsRoads
Economic Damages (in $)$1 to $100,000
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesThe reservoir drained fairly slowly from the detached pipe up through the slide scarp, and it flooded a Christmas tree packing and shipping area below the dam, which was occupied with about 20 workers when the flooding started. No injuries, but loss of productivity and some pumping required, and flooding sufficient to close but not damage a County road. Probably cost of 10K in damage, but with 200 K or more if the dam was to repaired to full storage. Owner plans to reconstruct as a non-statutory dam
Owner TypeP
Dam TypeRE
Primary Purpose(s)I
EAPNR
Dam Height28 ft
Max Storage (ac-ft)42.50
Surface Area (acres)4.00
Year Completed1981
NID NumberOR00729
River NameCENTER FORK DRIFT CREEK
Latitude44.884
Longitude-122.709
Year Modified
Regulatory Agency(ies)OWRD
Incident Time
Incident Duration
Incident Report Produced
Information SourcesOR Dam Safety
