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Channelization of the Missouri River below Sioux City eliminated <br />use of all riverine sandbar habitat and resulted in loss of nest <br />sites in Pottawattamie and Harrison counties, the only known <br />nesting habitat in the state (Dinsmore et al. 1984). <br />Great Lakes: Over the past 50 years, viable breeding of <br />Piping Plovers on the Great Lakes has diminished from eight <br />states (Minnesota, Wisconsin, Illinois, Indiana, Michigan, Ohio, <br />Pennsylvania, and New York) to only one state: Michigan. In <br />Minnesota, Piping Plovers have consistently nested in only two <br />counties: Lake of the Woods (Green and Janssen 1975, Wiens and <br />Cuthbert 1984, Davis 1985, Wiens 1986) and St. Louis (Lakela <br />1940, Niemi and Davis 1979). Records from Wisconsin do not <br />indicate that Piping Plovers occurred in large numbers anywhere <br />in the state. Nesting occurred on the south shore of Lake <br />Superior (Douglas and Ashland counties), sporadically on Lake <br />Michigan (Door, Kenosha, Oconto, Ozaukee, and Sheboygan <br />counties), and on Lake Koshkonong (Jefferson County) (Matteson <br />1987; unpub. Milwaukee Public Museum records). Further south in <br />Illinois, Piping Plovers bred in two counties (Lake and Cook) <br />adjacent to Lake Michigan (Nelson 1876, Russell 1973, Russell <br />1983). Similarly, Piping Plovers in Indiana nested along Lake <br />Michigan in Porter, Lake, and LaPorte counties (Russell 1973, <br />1983). <br />10 <br />F <br />