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Diego Negron & Kenneth Roy & Paula Bienenfeld, Marstel-Day; Dan Wagner, Geo-Sci Consultants; Gregory Katz, Louis Berger. The Anacostia River was transformed in the 19th and 20th Centuries, as the river channel was dredged and the riverâ€™s lowland flats were filled. Marshland became industrial space in a relatively short span of history. Joint Base Anacostia-Bolling (JBAB) occupies a portion of the east bank of the Anacostia River that was once heavily inhabited by Native Americans, and in the late nineteenth century became farmland and then a military airfield. Many archaeological sites have been identified at the base in surprising settings, frequently buried beneath fill. Marstel-Day and Louis Berger recently conducted a GIS-based landscape modeling exercise to assist the base with its cultural resource management mandates. The model directly compared mapped topography in the 19thcentury with modern, LiDAR-derived elevations, and used geomorphological soil cores and trenches to refine the model and gain a better understanding of the vertical and horizontal extents of fill deposits at the installation.