Technical Abstract: Since 1948, the USDA-NRCS has constructed over 10,450 upstream flood control dams in 2000 watersheds in 47 states, over two-thirds of these dams have a design life of 50 years. For many of these dams, the reservoirs are filling with sediment. A demonstration project was designed to evaluate technologies, methodologies, and protocols for the cost-effective characterization of sediment impounded by these structures. Preliminary results for the vibracoring activities at Sugar Creek #12, Hinton, OK and Sergeant Major #4, Cheyenne, OK are presented and discussed. Sedimentation rates determined through radioactive Cesium-37 techniques ranged from 0.017 to 0.067 mm/ha-yr. Stratigraphic analyses showed that at Sugar Creek #12 (1) stratigraphic correlation of some lithologies and time lines across the basin were possible, (2) silt and clay dominate the depositional history of the reservoir, and (3) deposition of sand was limited to areas near its tributary source. This stratigraphic information will be combined with on-going activities to completely address sedimentation issues within these aging flood control dams.