The Great Lakes Watershed Management System (GLWMS) is an online mapping and reporting tool that allows users to evaluate reductions in non-point source (NPS) pollutants and increases in groundwater recharge based upon best management practices. Users are able to conduct on-the-fly field scale scenario evaluations of land cover changes or best management practices for run-off volumes, sediment loading and other pollutant loads. The system links the High Impact Targeting (HIT) model from the MSU IWR with the Long Term Hydrologic Impact Assessment (L-THIA) model from Purdue University’s Department of Agricultural and Biological Engineering. The GLWMS represents the integration of several water quality modeling projects across the region, led by The Nature Conservancy, the U.S. Army Corps of Engineers Chicago District, IWR, and ABE-Purdue. An updated interface for the GLWMS is being developed and expected to be launched later in 2016.