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Settlement would increase flows and add fish‑passage measures, MassWildlife says
Summary
MassWildlife told a MassDEP information session that settlement terms would shift operations toward more natural flows across the bypass reach and downstream, expand habitat for shad and short‑nose sturgeon, and require new downstream and upstream passage structures with measurable performance goals and adaptive management.
The Massachusetts Division of Fisheries and Wildlife laid out the conservation case for settlement terms that would change flow operations and add fish‑passage infrastructure at Turners Falls.
"Dams dramatically degrade river ecosystems," Jesse Lehi of MassWildlife said, noting roughly 25 state and federal listed species in the project area and that the bypass reach provides important high‑gradient rocky habitat. Under the negotiated Flows and Fish settlement, minimum flows in the bypass reach would increase substantially at different times of year: Lehi described summer minimums in reach 1 increasing by a factor of about four and reaches 2–3 increasing by double‑digit factors in some months.
Caleb Slater, a fisheries biologist, described package elements in the settlement: replacement of the Cabot station trash rack with a full‑depth fish rack, a 3/4‑inch exclusion rack at Station 1, construction of a plunge pool below the dam, replacement of a poorly performing ladder with a fish lift, eel passage, and upgraded barrier nets at Northfield. The settlement includes measurable fish‑passage performance goals (for example, a downstream adult shad goal described as 95% survival within one kilometer and 24 hours, and upstream adult shad passage goals like 75% within 48 hours for certain approach distances), and an adaptive management framework involving tagging and repeated testing.
Panelists framed the settlement as a negotiated balance: higher summer flows in parts of the bypass would improve habitats downstream, but very high summer flows in reach 1 would threaten rare state‑listed plants there; the settlement sets higher minimums in reaches 2 and 3 while moderating reach 1 to limit losses of rare plants.
MassWildlife and federal agencies will evaluate fish‑passage performance after installation and can propose operational changes if performance goals are not met.
What to watch: whether MassDEP’s draft decision adopts conditions that reflect the settlement’s flow changes and fish‑passage performance metrics, and whether implementation schedules are accelerated or altered in response to peer review or public comment.
