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The Institute of Water Research (IWR) at Michigan State University (MSU) and Purdue University built an on-line watershed management system that can aid in the development of strategies to address TMDLs. The Swan Creek Watershed Management System (http://www.iwr.msu.edu/swancreek) utilizes dynamic online modeling to allow users to evaluate the environmental impacts of different agricultural and urban best management practices (BMPs) within the northwestern Ohio watershed. The system is built on-top of already established water-quality/quantity modeling technologies, including Digital Watershed, L-THIA (Long-Term Hydrologic Impact Assessment) and HIT (High Impact Targeting). Examples of the systems functionality include cost-benefit analyses of conservation tillages ability to reduce sediment run-off from farmland, and the impacts of urbanization on runoff volume and pollutant loading. Additionally, users can identify impaired waters, generate drainage basins around these locations, and view estimates of nutrient loads potentially causing the impairments. They can also digitize BMP and land-cover change scenarios on an on-line map to dynamically see what impact those practices may have on pollutant loading within that drainage basin. MSU and Purdue solicited and incorporated feedback from potential users in the systems design, including staff from local conservation districts, Ohio EPA, and watershed groups. With support from the U.S. Army Corps of Engineers, MSU and Purdue are planning to expand the systems coverage to other Great Lakes watersheds; though, it could be implemented in other parts of the nation, including the Chesapeake Bay Watershed.