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Study recommends replacing culvert and removing sluice gate to restore Namco Bog tidal marsh
Summary
A year‑long study presented by Interflu and Orleans Conservation Trust recommends removing a sluice gate and replacing an undersized culvert under Namco Road to restore tidal inundation and promote salt‑marsh recovery at Namco Bog; the commission and OCT plan to pursue grants and coordinate with DPW for downstream design work.
The Orleans Conservation Trust and consultants from Interflu presented findings from a year‑long study of Namco Bog (160 Namco Road) that argues for restoring tidal connectivity by removing a sluice gate and replacing an undersized culvert beneath Namco Road.
Tom Carris (Orleans Conservation Trust) introduced Andy Fallon, a geomorphologist with Interflu, who summarized site reconnaissance including bathymetry/topographic surveys, sediment probing (which found peat beneath a uniform sand layer), and water‑level monitoring that showed significant tidal attenuation across a sluice gate and a 12‑inch culvert. Fallon said three alternatives were evaluated: no action; remove the sluice gate; and remove the sluice gate plus replace the culvert. The study’s hydrologic modeling and alternatives matrix favored the third option, which would reconnect daily tidal flow to much more of the bog, enabling restoration of low‑ and high‑marsh zones, improving sediment delivery, and supporting fish habitat and nutrient attenuation.
Fallon described the technical needs for a modern stream crossing—typically an open‑bottom box culvert or large arched culvert sized to allow passage of sediment, tidal prism, and aquatic organisms—and estimated the current pipe is several times too small to accommodate full tidal exchange. Commissioners discussed interactions with DPW, potential road‑raising options, utilities in the crossing area, grant opportunities for design and construction, and the need to coordinate with state agencies for permits. Several commissioners and staff offered to help support grant applications and interdepartmental coordination.
No formal action was required; the presentation provided conceptual designs and a recommended path forward that the conservation trust and town staff will use in future grant and permitting work.
