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<br />4-4 <br /> <br />until one individual was captured and released alive in July of 1984 at <br />Black Rocks, river mile 135 (Personal communication, Lynn Kaeding, USFWS, <br />Grand Junction, CO, October 3, 1984). That fish constitutes the only recent <br />record of the species in the Upper Colorado River. This ERI investigation <br />failed to reveal any additional fishes of this species, and so the current <br />known distribution of the species relative to the JH-l project remains as <br />stated above. <br /> <br />4.5 Razorback Sucker. <br />The razorback sucker is native to the Colorado River System and is <br />thought to have once occupied much of the watershed (Wick et al. 1982). It <br />is now limited to about 600 miles of river, mostly in the upper basin. The <br />razorback sucker was proposed for federal listing as 'threatened' on April <br />23, 1978 but was removed from this status in April 1980 because of <br />deficiencies in the listing package. The species is now considered a <br />'candidate' and does not receive protection from the Endangered Species Act. <br />The ftearest recf!nt capture of an adult razorback sucker was in June of <br />1981 at river mile 178.0 (Valdez et al. 1982), about 10.2 miles downstream <br />of the JH-l site. Man,v adults have been captured at river mile 177.8 <br />(Clifton Ponds) and at river mile 163.6 (Walter Walker Wildlife Area). The <br />only recent upstream capture of adults was in June of 1981 at river mile <br />205.5, and in July of 1981 at river miles 220.7 and 223.5. One adult was <br />captured at each of these locations which are about 17.3, 32.5, and 35.3 <br />miles from the JH-l site, respectively. <br />In 1974 and 1975, Kidd (1977) reported capturing one adult razorback <br />sucker each year in the IIRoller Dam Spillway", herein referred to as the <br />Grand Valley Diversion Dam at river mile 193.6, about 5.4 miles upstream of <br />the JH-1 site. Kidd (1977) also reported 28 adult razorback sucker from <br />