This report serves to document research conducted under a Reimbursable Agreement between ARS and U.S. Environmental Protection Agency (EPA). Additional details of research can be found in the report for the inhouse project 6408-13000-017-00D, Integrated Assessment and Analysis of Physical Landscape Processes that Impact the Management of Agricultural Watersheds. Analysis of historical flow and sediment data in combination with field evaluations of channel stability resulted in improved estimates of "reference" or target values for sediment for ecoregions throughout the Mid South. This analysis was extended to include the magnitude, frequency, and duration of a range of concentrations for stable and unstable streams to be used by biologists to investigate threshold conditions for aquatic health. Collaborative research with NSL ecologists is underway at two sites in Mississippi to attempt to link aquatic community structure with flow and sediment-transport conditions. Version 4.1 of the inhouse bank-stability model has been completed and delivered to the stakeholder along with a User's Manual. Results are critical to action agencies to determine potential impacts of sediment on designated uses of Mid South water bodies.