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Consultants find Stevens Lake dam structurally marginal; URA to sample sediments before deciding on breach
Summary
An Oasis Consulting geotechnical study told Forest Park URA that Stevens Lake Dam’s embankment is marginal and should be remediated; consultants recommended sediment sampling and said a controlled breach could cost roughly $750,000, subject to permitting and contamination results.
Forest Park — A geotechnical study presented to the Forest Park Urban Redevelopment Agency found that Stevens Lake Dam on the south parcel has marginal structural stability and “should be remediated,” the consultant told the board.
Mike Montalione, executive vice president of Oasis Consulting Services, said drilling and analysis show high groundwater, active seepage through the embankment and no confirmed keyway or cutoff under the dam — features that normally keep groundwater from undermining an embankment. “The overall structural stability of the dam and the embankment is marginal at best and should be remediated,” Montalione said.
Montalione recommended planned remediation rather than waiting for a failure. He…
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