Small Craft Operator Andy Boyle surveys the waters of the Potomac River near Ronald Reagan Washington National Airport, while on the way to the Tidal Basin gates in Washington, D.C. (USACE photo by Christopher Fincham) The U.S. Army Corps of Engineers, Baltimore District’s Potomac and Anacostia Rivers Drift Collection and Removal Unit operates out of dock facilities adjacent to the Washington, DC, Navy Yard and conducts drift removal operations on a year-round basis.