|
Incident ID |
WA00000-3156 |
|
Dam Name |
BONASA BREAKS RANCH DAM |
|
Downstream Hazard Potential |
S |
|
State |
WA |
|
Incident Date |
04/13/2017 |
|
Incident Type |
Failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Insufficient Spillway Capacity |
|
Incident Mechanism 2 |
Overtopping |
|
Incident Mechanism 3 |
|
|
Incident Description |
An unpermitted dam impounding 36 acre-feet of water suddenly breached, releasing about 29 acre-feet of water. The resulting flood caused extensive damage to public infrastructure, private property, and critical stream habitat. No lives were lost. |
|
Named Hydrologic Event |
|
|
EAP Enacted (Y/N) due to Incident |
No |
|
Fatalities (Number) |
0 |
|
Number of People Evacuated |
0 |
|
Number of Habitable Structures Evacuated |
0 |
|
Number of Habitable Structures Flooded |
1 |
|
Other Infrastructure Impacts |
Roads, Bridges |
|
Economic Damages (in $) |
$10 million to $25 million |
|
Volume released at failure (ac-ft) |
29 ac-ft |
|
Response |
|
|
Additional Remarks or Updates |
Owner cost for penalties, dam stabilization and downstream repairs added up to about $3M. |
|
Incident Time |
|
|
Incident Duration |
1 hour |
|
Incident Report Produced |
Yes |
|
Information Sources |
|
|
Owner Type |
P |
|
Dam Type |
RE |
|
Primary Purpose(s) |
R |
|
EAP |
N |
|
Year Completed |
1960 |
|
Year Modified |
0 |
|
Dam Height |
19 ft |
|
Max Storage (ac-ft) |
36 ac-ft |
|
Surface Area (acres) |
4 acres |
|
River Name |
RATTLESNAKE CREEK - TR |
|
Latitude |
46.0947 |
|
Longitude |
-117.189 |
|
Regulatory Agency(ies) |
|
|
NID Number |
WA00000 |
|
Attachments |
|
