JOHNSTOWN - CO01772-3449


Incident ID CO01772-3449
Dam Name JOHNSTOWN
Downstream Hazard Potential H
State CO
Incident Date 09/25/2020
Incident Type Non-failure
Incident Driver Manmade Action
Incident Mechanism 1 Accident Or Misoperation
Incident Mechanism 2 Excessive/increased Seepage
Incident Mechanism 3
Incident Description
Named Hydrologic Event
EAP Enacted (Y/N) due to Incident Yes
Fatalities (Number) 0
Number of People Evacuated 0
Number of Habitable Structures Evacuated 0
Number of Habitable Structures Flooded 0
Other Infrastructure Impacts
Economic Damages (in $)
Volume released at failure (ac-ft)
Response
Additional Remarks or Updates
Incident Time 11:50 AM
Incident Duration 2 days
Incident Report Produced Yes
Information Sources CO DWR
Owner Type L
Dam Type RE
Primary Purpose(s) S
EAP Y
Year Completed 1953
Year Modified 0
Dam Height 16 ft
Max Storage (ac-ft) 258 ac-ft
Surface Area (acres) 34 acres
River Name BIG THOMPSON RIVER-OS
Latitude 40.3375
Longitude -104.959
Regulatory Agency(ies) DWR
NID Number CO01772
Attachments