Alabama is currently locked in a jurisdictional dispute with the U.S. Army Corps of Engineers regarding the management of the Mobile ship channel. A new state law mandates that a significant majority of dredged material be used for land restoration, a requirement the federal agency claims does not override its authority.
The 70 Percent Mandate for Shoreline Restoration
A new Alabama law requires that 70 percent of the material dredged from the Mobile ship channel be utilized for beneficial projects, such as marsh creation or shoreline restoration. according to the report,this state mandate specifically excludes the practice of placing sediment back into the water from its definition of "beneficial use."
The U.S. Army Corps of Engineers has pushed back against this requirement, asserting that the Mobile ship channel is a federal shipping channel. As reported, the federal agency maintains that state laws cannot override its established authority over the maintenance and operation of these waterways.
Distributing 6 Million Cubic Yards of Sediment
The U.S. Army Corps of Engineers expects to dreddge between four and six million cubic yards of materil annually from the Mobile ship channel. Under current operational plans, roughly 50 percent of this sediment is placed back into Mobile Bay using a technique known as thin-layer placement, while approximately 30 percent is moved offshore.
The remaining material is potentially allocated to shoreline and marsh restoration projects. This distribution pattern highlights the gap between current federal practice and the 70 percent restoration target set by the Alabama legislature, as the U.S. army Corps of Engineers argues that increasing restoration efforts requires the establishment of new partnerships.
The 2011-2014 Study and Thin-Layer Placement
The U .S. Army Corps of Engineers utilizes a "thin-layer placement" strategy that was developed following a study conducted by an interagency working group between 2011 and 2014. this method involves placing native sediment at least 2,500 feet away from the navigation channel in layers thinner than one foot, with placement sites rotated every four to six years to minimize environmental impact.
Data monitored by the Engineer Research and Development Center (ERDC) indicates that this sediment generally remains in its intended location and does not cause ecologically significant changes to pH, dissolved oxygen, or turbidity. The U.S. Army Corps of Engineers argues that this process mimics natural bay conditions, countering critics who describe the practice as "mud dumping."
Mobile Baykeeper and the Missing Public Hearing
The decision by the U.S. Army Corps of Engineers to forgo a public hearing on maintenance dredging has drawn sharp criticism from the Mobile Baykeeper and other environmental advocates . These critics argue that the lack of transparency hinders public oversight of how millions of cubic yards of sediment are handled in the region .
Several critical questions remain unresolved in this dispute. It is currently unclear how the U.S. Army Corps of Engineers defines the "partnerships" necessary to incresae beneficial use, nor is it clear if the federal government will eventually concede to the 70 percent state mandate to avoid protracted legal battles. Furthermore, the report only presents the U.S. Army Corps of Engineers' technical defense of thin-layer placement, leaving the specific scientific counter-arguments from the Mobile Baykeeper undetailed.
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