Boxborough commission authorizes emergency action to lower Beaverbrook water levels after beaver dams raise concern for fire pond

The Boxborough Conservation Commission authorized its planner to seek and, if necessary, issue an emergency order of conditions to breach a lowermost beaver dam on Beaverbrook after members reviewed field photos and heard that water levels have risen enough to reduce the capacity of a nearby fire-suppression pond.

Commissioners and staff inspected images and reported three dams—two larger ones backing up significant water and a smaller upstream dam—whose pooled water raises concern for downstream culvert function and the town’s fire-suppression supply. The town’s contracted engineer (Sue Carter) advised removing only the lowermost dam first to avoid releasing stored water from upper dams and creating downstream flooding.

Staff described options the owner could pursue (beaver deceiver devices or hiring a trapper), but noted trapping resources are limited and that deceiver devices require certain headroom (tractable water depth) to function. Commissioners discussed nonlethal options and emphasized using a breaching approach only as necessary to protect public safety and infrastructure.

The motion to authorize the planner or associate town planner to request and execute an emergency order for dam breaching passed on a voice vote. The commission asked staff to coordinate with the agricultural commission, the fire department, and the DPW on the operational approach (deceiver, trapping or breaching) and to report back promptly if major actions are required.

What’s next: staff will prepare the emergency filing if conditions demand it, explore deprioritized options with local trappers and Beaver Solutions contractors, and return to the commission with a timeline and cost estimate if physical work is authorized.