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Maryland officials outline Conowingo settlement details, set technical pathway to evaluate dredging
Summary
State environmental staff told Kent County commissioners that the Conowingo Dam water-quality certification and accompanying settlement create a $341 million mitigation fund, a $18.7 million dredge reserve and a staged plan — including Army Corps 3D modeling — to test whether large-scale dredging is feasible and fundable.
State Department of the Environment officials briefed Kent County commissioners on a 2025 water-quality certification and companion settlement tied to the Conowingo Dam, saying the agreements create a mitigation fund intended to finance watershed projects and a dedicated dredge reserve while the state pursues technical studies and local input.
Danielle Spendiff, chief of the regulatory and customer service division in the Wetlands and Waterways Protection Program, described the revised Water Quality Certification (WQC) as "the outcome of that process, and it's legally durable based on the best available science," and said many of the WQC's conditions and the settlement's commitments are enforceable only once the Federal Energy Regulatory Commission (FERC) issues a new license.
Why it matters: The Conowingo reservoir traps sediment and contaminants flowing down the Susquehanna River; commissioners and local watermen have blamed sediment and invasive species for declines in fisheries and shoreline impacts. Commissioners pressed state officials for clarity on how the roughly $341 million referenced in the settlement (spread over a multi‑decade license) will be spent and whether it will be sufficient to address large‑scale dredging, debris removal and living‑shoreline or upstream projects.
What officials said: State representatives said the settlement and WQC are intended to fund projects that demonstrably "move the needle" on water quality rather than simply transfer money. The settlement includes a dredge reserve fund of $18,700,000 over 25 years and an initial allocation (described in the briefing) of approximately $20,000,000 to support dredging feasibility, staging and permitting efforts.
Danielle Spendiff outlined a three‑step pathway to any potential large‑scale dredging: (1) complete a non‑proprietary Army Corps 3‑D modeling study of sediment transport and hydrodynamics in the reservoir; (2) use the dredge reserve and other funds for economic feasibility studies, expert panels and permitting work to determine viability and how to credit dredging toward Bay TMDL goals; and (3) move to implementation only if dredging is shown to deliver measurable water‑quality benefits, to be fundable, and to have acceptable environmental and logistical impacts. The Army Corps modeling is expected to be completed in late 2026 to early 2027, officials said.
Scale and costs: Officials warned that the reservoir is landlocked and logistically complicated. As an illustration, Spendiff said a potential large dredge could remove on the order of 5 million cubic yards annually ("like filling the Baltimore Ravens stadium twice a year"). Older cost estimates for large dredges have ranged widely; officials said prior high‑end estimates were on the order of $150 million to $400 million for a major removal event and that maintenance dredging could be required periodically. State staff emphasized they will pursue technologies, reuse opportunities and possible federal support to reduce costs and make projects fundable.
Local reaction: Commissioners expressed frustration that Maryland farmers and watermen have borne regulatory costs while much of the sediment originates upstream in Pennsylvania. One county leader said the settlement total "is not a lot of money" relative to the scale of the problem and questioned whether it would "move their needle" for Constellation, the dam owner. Officials acknowledged the concern and said the funding structure is front‑loaded to enable early, meaningful projects and that an advisory group of county representatives will guide priorities.
Next steps and oversight: MDE officials said they will share the slide deck and supporting materials with county staff, convene an advisory group of Eastern Shore county representatives (initial meetings targeted in early 2026) and continue coordination with federal partners, the Army Corps modeling team and Constellation on access and permitting. Spendiff reiterated: WQC conditions will not be enforceable until FERC issues a license, and the settlement contains commitments from Constellation to cooperate on studies and access.
The meeting closed with officials pledging continued dialogue and regular updates, and county leaders asking the state and Constellation to be held accountable as technical work proceeds.
