Two hundred years ago, the first Army engineers began carving the way for some of the earliest maritime traffic into Baltimore, opening waterways to commerce, beginning the initial discussions of Bay health and of ecological stewardship, and joining the rivers of the Bay’s ancient hydrography in etching a record of their presence across the region’s landscape as the Susquehanna, Potomac, Choptank, and Patapsco had long done. They do it still.