Franklin outlines beaver coexistence strategy, emphasizes non-lethal flow devices and permitting hurdles

Briai Goodlander, Franklin’s conservation director, presented a detailed primer on North American beavers and non-lethal management methods to the Conservation Commission on June 4.

Goodlander told the commission that beaver-built wetlands “are among the most biologically productive ecosystems in the world,” and outlined benefits including improved water quality, groundwater recharge, erosion control and habitat diversity. She said the town has seen measurable value from installing devices that maintain pond levels without removing beavers.

Goodlander and Derek Adams of the Department of Public Works described the town’s current toolkit: flexible pond-leveler flow devices, keystone fences and culvert-protection measures that allow water to pass while preventing beavers from blocking structures. Adams said professionally designed systems can exceed a 95% success rate for protecting culverts and retention structures.

The presenters walked commissioners through local examples. They said six flow devices have been installed in the last two years and two additional sites are permitted but not yet constructed. Goodlander explained how a typical device is set into the stream bed, “you notch the beaver dam, you thread that pipe along the bottom of the stream bed,” and the beavers then raise material around the device without raising the pond level beyond safe limits. Adams added that routine maintenance is essential: each installed device can require regular checks and debris removal, a task that consumes maintenance hours.

Both staff flagged staffing, safety and permitting as the largest constraints. Goodlander noted that training to become certified in flow-device installation typically requires roughly 240 hours and peer-reviewed projects, with course costs around $2,500. Adams said his crew is small (three full-time employees plus vacancies) and on-call municipal duties—stormwater repairs, street sweeping, detention-basin inspections—compete for time. At remote or constrained sites, equipment access and worker safety further complicate installations.

The presenters also reviewed legal and coordination issues. Goodlander said flow devices often require Conservation Commission approval (RDAs or NOIs) and Board of Health sign-off when a septic or public-health concern is involved. They emphasized that private property and public infrastructure across parcel boundaries add legal complexity: ownership and long-term maintenance responsibilities must be clarified before town crews install devices.

Commissioners and staff discussed specific sites that have been problematic (including a large culvert on Grove Street and a pinch point in a corridor near 495) and described case-by-case decisions the town makes before escalating to trapping. Adams said the town follows an ordered checklist—site reconnaissance, resident contact, aerial imagery review, coordination with the licensed trapper and Board of Health—before lethal control is considered, and that lethal removal remains a last resort when infrastructure or public safety is at risk.

Commissioners praised the presentation and requested staff post the slides and supporting materials online. Goodlander said she would provide the infographic on permitting and the presentation slides for broader public information. The commission also discussed potential county-level coordination and grant opportunities to help fund installations, training and maintenance.

The presentation concluded with an emphasis on coexistence and procedural clarity: the town will continue to use non-lethal devices where feasible, seek funding and training opportunities, and coordinate with landowners and the Board of Health when situations cross private and public lines.