GRIGGS LAKE DAM - IN00722-3327
Dam Name: GRIGGS LAKE DAM
State: IN
Downstream Hazard Potential: H
Incident Type: Non-Failure
Incident Date: 02/25/2019
Incident Driver: Deterioration or Poor Condition
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2Sinkhole
Incident Mechanism 3
Incident IDIN00722-3327
Incident DescriptionSinkhole is located directly over the CMP principal spillway pipe, bout 1/3 of the way down the back slope of the dam. It is approximately 8 feet in diameter and 8 feet deep to the exposed pipe.
Named Hydrologic Event
EAP Enacted (Y/N) due to Incident
Fatalities (Number)
Number of People Evacuated
Number of Habitable Structures Evacuated
Number of Habitable Structures Flooded
Other Infrastructure Impacts
Economic Damages (in $)
ResponseOwner immediately started pumping the lake down with a 6 inch pump
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner TypeP
Dam TypeRE
Primary Purpose(s)R
EAPNR
Dam Height22 ft
Max Storage (ac-ft)82.00
Surface Area (acres)6.00
Year Completed1964
NID NumberIN00722
River NameUNNAMED TRIBUTARY THOMPSON DITCH
Latitude39.4406
Longitude-87.3558
Year Modified
Regulatory Agency(ies)IDNR
Incident Time
Incident Duration
Incident Report Produced
Information SourcesIDNR
