|
Incident ID |
MT03847-3613 |
|
Dam Name |
DRY HOLLOW |
|
Downstream Hazard Potential |
L |
|
State |
MT |
|
Incident Date |
03/15/2023 |
|
Incident Type |
Failure |
|
Incident Driver |
Hydrologic/flooding |
|
Incident Mechanism 1 |
Debris Clogging |
|
Incident Mechanism 2 |
Erosion |
|
Incident Mechanism 3 |
Overtopping |
|
Incident Description |
Dam experienced a runoff event, overtopped and failed. Spillway was fully obstructed with deep snow. |
|
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 |
|
Economic Damages (in $) |
$1 to $100,000 |
|
Volume released at failure (ac-ft) |
49 ac-ft |
|
Response |
|
|
Additional Remarks or Updates |
Damage to culvert, dirt road crossing. |
|
Incident Time |
5:00 PM |
|
Incident Duration |
|
|
Incident Report Produced |
Yes |
|
Information Sources |
MT DNRC Dam Safety Program |
|
Owner Type |
P |
|
Dam Type |
RE |
|
Primary Purpose(s) |
I |
|
EAP |
NR |
|
Year Completed |
1999 |
|
Year Modified |
0 |
|
Dam Height |
25 ft |
|
Max Storage (ac-ft) |
41 ac-ft |
|
Surface Area (acres) |
7 acres |
|
River Name |
DRY HOLLOW CREEK |
|
Latitude |
45.9521 |
|
Longitude |
-111.708 |
|
Regulatory Agency(ies) |
DNRC |
|
NID Number |
MT03847 |
|
Attachments |
|
