|
Incident ID |
OR00729-3162 |
|
Dam Name |
HEATER RESERVOIR #2 |
|
Downstream Hazard Potential |
S |
|
State |
OR |
|
Incident Date |
11/23/2016 |
|
Incident Type |
Failure |
|
Incident Driver |
Other |
|
Incident Mechanism 1 |
Spillway Pipe Failure |
|
Incident Mechanism 2 |
Sliding |
|
Incident Mechanism 3 |
|
|
Incident Description |
Deformation 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 Incident |
No |
|
Fatalities (Number) |
0 |
|
Number of People Evacuated |
20 |
|
Number of Habitable Structures Evacuated |
0 |
|
Number of Habitable Structures Flooded |
0 |
|
Other Infrastructure Impacts |
Roads |
|
Economic Damages (in $) |
$1 to $100,000 |
|
Volume released at failure (ac-ft) |
|
|
Response |
|
|
Additional Remarks or Updates |
The 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 |
|
Incident Time |
|
|
Incident Duration |
|
|
Incident Report Produced |
|
|
Information Sources |
OR Dam Safety |
|
Owner Type |
P |
|
Dam Type |
RE |
|
Primary Purpose(s) |
I |
|
EAP |
NR |
|
Year Completed |
1981 |
|
Year Modified |
0 |
|
Dam Height |
28 ft |
|
Max Storage (ac-ft) |
42 ac-ft |
|
Surface Area (acres) |
4 acres |
|
River Name |
CENTER FORK DRIFT CREEK |
|
Latitude |
44.884 |
|
Longitude |
-122.709 |
|
Regulatory Agency(ies) |
OWRD |
|
NID Number |
OR00729 |
|
Attachments |
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