|
Incident ID |
CA00122-3257 |
|
Dam Name |
MOCCASIN LOWER |
|
Downstream Hazard Potential |
H |
|
State |
CA |
|
Incident Date |
03/22/2018 |
|
Incident Type |
Non-failure |
|
Incident Driver |
Other |
|
Incident Mechanism 1 |
Insufficient Spillway Capacity |
|
Incident Mechanism 2 |
Reservoir Overfilling |
|
Incident Mechanism 3 |
Spillway Erosion/head Cutting |
|
Incident Description |
Blockage of Moccasin Creek Bypass Tunnel caused sudden rise of the reservoir above core wall to nearly the dam crest because of insufficient spillway capacity. More in Remarks. |
|
Named Hydrologic Event |
|
|
EAP Enacted (Y/N) due to Incident |
Yes |
|
Fatalities (Number) |
0 |
|
Number of People Evacuated |
20 |
|
Number of Habitable Structures Evacuated |
1 |
|
Number of Habitable Structures Flooded |
1 |
|
Other Infrastructure Impacts |
Water/sewer lines |
|
Economic Damages (in $) |
$25 million to $50 million |
|
Volume released at failure (ac-ft) |
|
|
Response |
Immediate response by dam owner, Division of Safety of Dams, and first responders. |
|
Additional Remarks or Updates |
Fish Hachery immediately downstream was evacuated - likely less than 20 people |
|
Incident Time |
|
|
Incident Duration |
2 days |
|
Incident Report Produced |
Yes |
|
Information Sources |
CA DSOD |
|
Owner Type |
L |
|
Dam Type |
RE |
|
Primary Purpose(s) |
HOS |
|
EAP |
Y |
|
Year Completed |
1930 |
|
Year Modified |
0 |
|
Dam Height |
60 ft |
|
Max Storage (ac-ft) |
554 ac-ft |
|
Surface Area (acres) |
29 acres |
|
River Name |
MOCCASIN CREEK |
|
Latitude |
37.8123 |
|
Longitude |
-120.306 |
|
Regulatory Agency(ies) |
DWR, SAFETY OF DAMS |
|
NID Number |
CA00122 |
|
Attachments |
|
