In recent weeks, there has been increased public discussion regarding dredged material placement practices in Mobile Bay, including assertions that these practices are causing widespread harm to oysters, seagrass, and fisheries. The U.S. Army Corps of Engineers believes it is important to clarify the facts and provide context grounded in science, data, and long-standing environmental review.
Thin-layer placement is not “mud dumping.” It is a measured, monitored, and science-based sediment management practice designed to mirror natural sediment processes that have shaped Mobile Bay over thousands of years. This practice has been used in Mobile Bay for more than a decade under state and federal permits, with continuous environmental monitoring and regulatory oversight.
Importantly, thin-layer placement was not adopted unilaterally by the Corps. In 2014, this approach was developed and vetted through a multi-agency working group that included environmental stakeholders — including Mobile Baykeeper — and resulted in thin-layer placement being identified as an acceptable beneficial use practice for Mobile Bay. That collaborative process was grounded in available science and regional sediment management principles.
Claims that Corps dredging is the primary driver of oyster or seagrass decline are not supported by comprehensive scientific data. Long-term monitoring and environmental analyses consistently show that changes in these resources are influenced by a complex combination of factors, including extreme weather events, freshwater inflows, salinity variability, disease, historical harvesting practices, and broader climatic conditions.
Equally important is the broader environmental context. Sediment is not waste — it is a critical component of a healthy estuary. Removing sediment from the system entirely, including forcing offshore disposal as a default, can accelerate shoreline erosion, degrade wetlands, and reduce the bay’s natural resilience over time. The Corps’ approach is designed to keep clean sediment within the system while avoiding sensitive habitats and using adaptive management informed by real-world data.
Similar sediment management practices are used across the country, including in Louisiana, Maryland, New Jersey, and Georgia, where thin-layer placement has supported marsh restoration and coastal resilience. These practices reflect a national shift toward treating dredged material as an environmental resource when conditions allow.
The U.S. Army Corps of Engineers respects the role of public dialogue and environmental advocacy. At the same time, decisions affecting Mobile Bay should be informed by science, long-term monitoring, and a full understanding of environmental tradeoffs. Policy outcomes based on incomplete or misleading characterizations risk unintended consequences that could undermine both environmental stewardship and economic sustainability.
The Corps remains committed to transparency, interagency coordination, and science-based decision-making. We welcome continued engagement focused on facts, data, and shared responsibility for the long-term health of Mobile Bay.
Zachary L. Miller Brigadier General, U.S. Army
An Open Letter on Mobile Bay, Science, and Stewardship
Release no. 26-004