State reclassifies local dam as high hazard; town told to widen engineering and evacuation planning

A presenter at the Palmyra town meeting said the state Department of Natural Resources has reclassified the town’s dam from "significant" to "high" hazard after finding that 13 homes and five commercial buildings lie in the potential inundation area.

The presenter told the board that the DNR’s memo prompted an engineering study and will require the town to retain an engineering firm to re-evaluate the dam every two years. "Everything on the dam and that well," the presenter said, "the risk of dam failure is listed as low to medium, and they’ve included that the facility has been consistently well maintained." The presenter added that the town will also need to make changes to maintenance, downstream riprap, and mitigation measures.

The reclassification carries practical consequences, the presenter said: the town must develop updated mitigation work and coordinate an IDAP process that will involve the town marshal to address evacuation and public-safety procedures. The presenter said the insurer is reviewing the case and that the town will provide the final engineering report to the DNR when it is complete.

Why it matters: a high-hazard classification focuses regulatory attention on operations and emergency planning because potential failure could endanger people and commercial property downstream. The board heard that the classification will change inspection routines and increase the frequency of formal engineering oversight.

Board members asked for time to review the final engineering materials; the presenter said the draft is expected and the town will file the final report with the DNR when it is complete. The presenter asked the town to allow about two weeks before the next meeting so the item can be placed on an upcoming agenda for further discussion.

The meeting did not record a specific timetable for new mitigation work or a final schedule for evacuation planning, and the insurance company’s decision on coverage was described as "pending." The board did not take a formal vote on remediation measures at the meeting; members directed staff to bring the final engineering documents back for consideration and to coordinate next steps with the town marshal and counsel.