U.S. Geological Survey, 2004, Proceedings of the Invasive Species Research Strategic Planning Workshop of the Upper Midwest Environmental Sciences Center, September 2004, 113 p. SUMMARY Executive Summary Management of the U.S. Geological Survey (USGS) Upper Midwest Environmental Sciences Center (UMESC) launched a research initiative to address growing concerns about aquatic invasive species in the Great Lakes and Mississippi River basins. A draft UMESC Invasive Species Research Strategic Plan was developed by a group of UMESC scientists to help guide Center research. The purpose of this workshop was to present and obtain comments on the draft document, to share UMESC capabilities in this area, to obtain input on the immediate regional research needs on invasive species, and to identify areas of overlap between our Center strategic plan and partner priorities. The workshop was held on June 23, 2004, in La Crosse, Wisconsin, and was attended by 25 participants from Federal, state, and nongovernmental organizations. During the workshop, participants were oriented to the USGS Invasive Species Program Element, historical and ongoing invasive species research at UMESC, and the draft UMESC Invasive Species Research Strategic Plan. Discussions in breakout sessions led to the development of a list of partner priorities for invasive species research and a thorough analysis of the elements of the draft strategic plan. The relevancy, organization, and utility of the draft UMESC Invasive Species Research Strategic Plan were then discussed in an open forum. The results of this workshop will be used to improve and finalize the UMESC Invasive Species Research Strategic Plan. Sincere thanks go out to the workshop participants who so freely shared their time, thoughtful reflection, and ideas.