MANAWA DAM - WI00225-3611
Dam Name: MANAWA DAM
State: WI
Downstream Hazard Potential: L
Incident Type: Failure
Incident Date: 07/05/2024
Incident Driver: Hydrologic/Flooding
Incident Mechanism 1: Debris Clogging
Incident Mechanism 2Overtopping
Incident Mechanism 3
Incident IDWI00225-3611
Incident DescriptionOvertopping due to heavy rain and debris blockage at 3 part open gates. Breach formed at RT abutment.
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentYes
Fatalities (Number)0
Number of People EvacuatedUnknown
Number of Habitable Structures EvacuatedUnknown
Number of Habitable Structures Flooded0
Other Infrastructure ImpactsBridges, Water/sewer lines
Economic Damages (in $)$100,000 to $500,000
ResponseCity contacted operator, lives out of town, monitors level remotely, but gates operated on site.
Volume released at failure (ac-ft)
Additional Remarks or UpdatesApprox. 5.5 inches rainfall in approx. 4 hours, with potential 4” in one hour.
Owner TypeL
Dam TypePG
Primary Purpose(s)HR
EAPNR
Dam Height15 ft
Max Storage (ac-ft)1070.00
Surface Area (acres)195.00
Year Completed1920
NID NumberWI00225
River NameLITTLE WOLF
Latitude44.4667
Longitude-88.9167
Year Modified
Regulatory Agency(ies)WIDNR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesWIDNR
