Claude Johnson Dam - MD00000-3432
Dam Name: Claude Johnson Dam
State: MD
Downstream Hazard Potential: L
Incident Type: Non-Failure
Incident Date: 03/02/2020
Incident Driver: Seepage/Internal Erosion
Incident Mechanism 1: Spillway Pipe Failure
Incident Mechanism 2Piping
Incident Mechanism 3Sinkhole
Incident IDMD00000-3432
Incident DescriptionOwner contacted MDE, 25'x10x7' sinkhole upstream. Nearly breached
Named Hydrologic Event
EAP Enacted (Y/N) due to IncidentNo
Fatalities (Number)0
Number of People Evacuated0
Number of Habitable Structures Evacuated0
Number of Habitable Structures Flooded0
Other Infrastructure Impacts
Economic Damages (in $)Unknown
ResponseSiphon installed and pool restricted until repairs
Volume released at failure (ac-ft)
Additional Remarks or Updates
Owner Type
Dam TypeRE
Primary Purpose(s)R
EAPNR
Dam Height11 ft
Max Storage (ac-ft)28.00
Surface Area (acres)3.00
Year Completed1960
NID NumberMD00000
River NameSt. Marys River
Latitude38.2835
Longitude-76.5378
Year Modified
Regulatory Agency(ies)MD Dam Safety
Incident Time
Incident Duration3 months
Incident Report ProducedNo
Information SourcesMD Dam Safety
