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Resource managers are realizing the benefits of using geographic information systems to supply visual spactal data for use in making informed management decisions. This report details the ARC/INFO (ESRI, Redlands, CA) procedures used at the Environmental Management Technical Center in Onalaska, Wisconsin, to assist Upper Mississippi River National Wildlife and Fish Refuge mangers in the process of acquiring refuge land through a land exchange. Refuge managers required boundaries for both 430- and 500-acre parcels that included the most desirable land cover/use types. Hardcopy maps of the area showing the total acreage for each land cover/use type will be used during land exchange negotiations.
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Management of water surface elevations at 27 dams affects much of the floodplain habitat in a 653-mi stretch of the Upper Mississippi River (UMR) between St. Louis, Missouri, and Minneapolis, Minnesota. In 1930, Congress authorized most of these dams to maintain a 9-foot navigation channel. This report provides a systemic overview of current operating plans at dams on the UMR and analyzes historical data to determine how well the operating plans are being met. Water level elevations at all 27 dams on the UMR are regulated as a function of discharge, although plans are specific for each dam. The U.S. Army Corps of Engineers strives to maintain a target water level at a specific location in a pool (control point)...
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