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<br />II <br />I <br />I <br />I <br />I <br />I <br />'I <br />I <br />'I <br />I <br />il <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />000661 <br /> <br />3.0 LITERATURE REVIEW <br />3.1 Scope of Area Affected <br />The Platte River basin drains an area of approximately 90,000 square <br />miles located within the states of Nebraska, Wyoming and Colorado (Wesche et. <br />al. 1988). This drainage system is composed of three major segments: the North <br />Platte River, the South Platte River, and the main portion of the Platte River <br />(Figure 1). The main portion of the Platte River begins at the confluence of the <br />North and South Platte Rivers, and flows in an easterly direction across the <br />plains of Nebraska until its confluence with the Missouri River near Omaha, <br />Nebraska. The central portion of the Platte River forms a wide bend from the <br />confluence of the North and South branches to Columbus, Nebraska. This <br />reach of the river is often referred to as the "Big Bend" section of the River <br />(Figure 1). Throughout this section, the Platte River has formed into a wide, <br />braided channel with numerous islands. <br />Contained within these islands and adjacent cultivated fields are many of <br />the wet meadows available for the migratory whooping crane and sandhill crane. <br />The other wet meadows are found in low-lying areas within the Platte River <br />valley. Currently only 27,353 acres of wet meadow vegetation remain, of which <br />18,828 acres are located in the Big Bend reach (Currier et. al. 1985). <br /> <br />3.2 Background of Problem. <br />Although decreasing flows in the Big Bend reach of the Platte River can <br />be attributed to several factors that will be discussed later, the many studies that <br />have been done concerning this problem really began after the whooping crane <br />was listed as an endangered species on March 11, 1967 (32 Federal Register <br />4001). The listing of the whooping crane as endangered became very <br />significant in 1973 with the passage of the Endangered Species Act. The <br />Endangered Species Act (ESA) is a revolutionary document. It was the first <br />piece of major legislation that sought to protect endangered species <br /> <br />3 <br />