Miacomet Pond is going to be dredged — starting this fall.

 

After years of study, permitting, and quiet movement through state and local review, the Town of Nantucket has now formally put the project out to bid, marking the final step before construction begins.

 

Project documents show dredging is scheduled to start in September 2026 and continue through the fall and winter months — a timeline driven in part by environmental restrictions that prohibit work during the spring and summer.

 

The scope is substantial: approximately 80,000 cubic yards of nutrient-laden sediment, with total removal potentially reaching 135,000 cubic yards, will be excavated from the pond bottom and transported to the Surfside Wastewater Treatment Plant for processing.

 

This is not maintenance. It is a full-scale intervention in one of the island’s most impaired and visible freshwater systems — and it is now fully permitted.

 

A Project Years in the Making

The dredging effort has cleared every major regulatory hurdle.

 

The project received:

• A Conservation Commission Order of Conditions in July 2024

• A MEPA Environmental Impact Report Certificate in September 2024

• A 401 Water Quality Certification from MassDEP in June 2025

• A Chapter 91 Waterways Permit in July 2025

 

Together, these approvals represent a comprehensive state and local review process — one that evaluated water quality, wetlands impacts, and rare species habitat before allowing the project to proceed. 

 

At its core, the rationale is straightforward: Miacomet Pond is impaired, and dredging is viewed as a necessary step to reduce internal nutrient loading and improve long-term water quality.

 

Why the Work Will Happen in Winter

One of the most consequential details in the permit conditions is when the work is allowed to occur.

 

Dredging is explicitly prohibited between April 1 and August 31, unless additional monitoring plans are approved. This restriction is designed to protect nesting shorebirds, including the Least Tern, and other seasonal habitat use around the pond. As a result, the project is effectively constrained to a fall-to-early-spring construction window.

 

State environmental review documents reinforce this approach, noting that construction is expected to occur during the “off-season” — both to reduce conflicts with peak public use and to comply with ecological timing restrictions.

 

In other words, the September-to-April window is not incidental. It is required.

 

The Tradeoff Beneath the Surface

That seasonal constraint introduces a different question — one that is less clearly addressed in the public-facing documents.

 

While the permit conditions include detailed protections for:

• shorebirds and nesting habitat

• rare plant species

• wetland buffers and shoreline vegetation

 

They do not clearly outline species-specific protections for organisms that overwinter in the pond itself.

 

That includes:

• turtles, such as painted and snapping turtles, which brumate in bottom sediments

• amphibians, including frogs that overwinter in aquatic environments

• benthic macroinvertebrates that live within the very sediments targeted for removal

 

The project does include broad environmental safeguards — erosion controls, turbidity management, incident reporting requirements, and limits on dredging near vegetated edges. But within the permit conditions reviewed, there is no explicit discussion of how dredging during the fall and winter months may affect these overwintering species, or what mitigation measures would be used.

 

At the same time, the project documentation acknowledges that the pond and surrounding conservation lands contain “multiple threatened and endangered resources that must be protected throughout the project.”

 

That tension is at the center of the issue.

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A Necessary Project — With Open Questions

None of this suggests that the project was improperly reviewed or rushed through the regulatory process. On the contrary, the permitting pathway reflects years of planning and coordination across multiple agencies.

 

But it does point to a more nuanced reality: In protecting one set of species — particularly nesting shorebirds — the project has been pushed into a construction window that overlaps with the dormant period of others.

 

Whether that tradeoff was fully evaluated, and how those impacts will be managed in practice, is not immediately clear from the publicly available materials.

 

What Happens Next

With the project now out to bid, the next steps are straightforward:

• Contractor selection

• Final construction planning

• Implementation beginning in fall 2026

 

Additional details may emerge as part of contractor submittals, including construction sequencing and site-specific work plans required before dredging begins.

 

For now, the larger question remains: As Miacomet Pond dredging moves from planning to reality, does the public have a complete picture of the ecological tradeoffs involved — or only part of it?

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- Nino Abdaladze
Below Deck Contributor
3/18/26