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Utility director briefs Assembly on Crystal Lake (Blind Slough) dam safety; FERC plans and monitoring reviewed
Summary
Utility Director Hagerman presented the borough’s Owner’s Dam Safety Plan for Crystal Lake Dam, outlining FERC-required plans, monitoring, training and contingency measures; assembly members asked about SCADA backups, seepage monitoring and spillway erosion.
Utility Director Carl Hagerman presented the Petersburg Borough’s Owner’s Dam Safety Plan (ODSP) for the Crystal Lake (Blind Slough) dam and related facilities, describing Federal Energy Regulatory Commission (FERC) requirements, inspection and monitoring programs, training and response protocols.
Hagerman told the assembly that the Crystal Lake Dam is classified as a high-hazard dam because homes at the hatchery and recreational areas would be at risk in the event of a breach. He said the structure is “about 34 foot high, 200 foot long, rock fill dam with a concrete face on the upstream side” and described the parapet and an ungated spillway. Hagerman also said the reservoir provides roughly 5,200 acre-feet of storage and described the penstock, powerhouse…
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