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This reach of the Missouri River begins at the Gavins Point Dam and extends <br />downstream to the confluence of the Missouri and Mississippi rivers near St Louis, Missouri. <br />The lower Platte River is in RPMA 4. Within this area there are several distinctive reaches. First, <br />there is the unchannelized reach (also designated as Segment 7) which extends from Gavins <br />Point dam downstream to near Sioux City, Iowa. The James River and the Vermillion River join <br />the Missouri River from the north within this segment. Two early records of pallid sturgeon in <br />South Dakota were taken from this reach shortly after closure of Fort Randall Dam, but none <br />have been recorded from the tributary rivers (Bailey and Allum 1962; Bailey and Cross 1954; <br />Keenlyne 1989). Recent studies have collected numerous pallid sturgeon in this segment and it <br />has been the site of several releases of hatchery reared pallid sturgeon (U.S. Fish and Wildlife <br />Service 2007). <br />The river segments from Sioux City downstream to the mouth the Missouri River have <br />been channelized for navigation. At Sioux City, the Big Sioux River joins the Missouri from the <br />north. The next major tributary in this reach is the Platte River, south of Omaha, Nebraska. This <br />reach of the Missouri River has been designated as segment 8. The reach from Omaha, Nebraska <br />to the Kansas River near Kansas City, Kansas has been designated as segment 9. The Kansas <br />River (segment 11) has historical records of pallid sturgeon captures, but they are considered <br />extirpated from that system (Cross 1967; Cross and Moss 1987). <br />In Missouri the river receives additional water from the Grand River, the Osage River <br />and the Gasconade River, but pallid sturgeon are only known from the main stem of the Missouri <br />River (Pflieger and Grace 1987) This portion of the Missouri River includes monitoring and <br />assessment segments 10, 12, 13 and 14.