PORTNEUF - ID00180-3586
Dam Name: PORTNEUF
State: ID
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 05/10/2023
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Spillway Erosion/Head Cutting
Incident Mechanism 2Spillway Deficiency
Incident Mechanism 3
Incident IDID00180-3586
Incident DescriptionSpillway Failure-severe erosion of the emergency spillway downstream channel and associated
removal of soil materials beneath the existing concrete apron-Snowmelt resulting from above normal winter accumulation
removal of soil materials beneath the existing concrete apron-Snowmelt resulting from above normal winter accumulation
Named Hydrologic Event
EAP Enacted (Y/N) due to Incident
Fatalities (Number)
Number of People Evacuated0
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded
Other Infrastructure Impacts
Economic Damages (in $)
Response
Volume released at failure (ac-ft)
Additional Remarks or UpdatesMinor Flooding of Farm Buildings and Non-Habitable Infrastructure
Owner TypeP
Dam TypeRE
Primary Purpose(s)
EAPY
Dam Height55 ft
Max Storage (ac-ft)20504.00
Surface Area (acres)1593.00
Year Completed1912
NID NumberID00180
River NamePORTNEUF RIVER
Latitude42.8787
Longitude-111.943
Year Modified
1949
Regulatory Agency(ies)IDWR
Incident Time
Incident Duration2 Days
Incident Report ProducedYes
Information SourcesID DWR
