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challenge to recovery. Contaminants may pose a lesser threat as well, but the magnitude of this <br /> threat is in need of further investigation. <br /> 2.5 Critical Habitat <br /> Critical habitat was designated for all four endangered fish in 1994 (59 FR 13374). It consists of <br /> river segments and associated areas within the 100-year floodplain within each species'historical <br /> range. Different reaches have been designated for each species, and are discussed for each <br /> species within the action area in the Baseline section below. Figure 6 shows critical habitat for <br /> the Colorado pikeminnow,which is confined to the upper Colorado River Basin (above Lake <br /> Powell). Critical habitats for the other three endangered fish are found in the lower Colorado <br /> River Basin as well. Within the upper Colorado River Basin, critical habitats for the other three <br /> endangered fish are largely subsets of that designated for the Colorado pikeminnow (i.e., shorter <br /> reaches) (see 59 FR 13374 for maps of all critical habitat units designated for each endangered <br /> fish). <br /> Salt Lake City Oil <br /> : l T A M O-- U N ' ` <br /> 7 nnY city u N N S cra'rg <br /> TooPrP <br /> Ver <br /> Proves <br /> 7. <br /> I <br /> [ Price GYpwm c. <br /> e Jar • <br /> N . <br /> Asper <br /> f /�g?,' rr rl r r.try r.n F.-nrrnlr <br /> •R id,fiP lr{ kk r <br /> r.t ..Y. •MPII O'rJSC L•Lrllll1T011 <br /> 5 A � <br /> N <br /> �Hm ff N i. G� <br /> ry <br /> Monty <br /> o - <br /> G r <br /> _ Page .,. <br /> .-yam ,.. ,.._ <br /> x. ,J' K2Y2rlta• "" ""._ FY'ntl s .... � .. :. _..._ <br /> f'( 'Cop�ight©2MNAt IGeagraphic Socieiy.7 �ed.Cdntent rrfaynoPreAecl National eagrap ic's <br /> e` currentmap.pchcC,Srurces.National Geagraphic.Esri.Ce Lorme.HERE-UNEP-MMC CSGS.NASA <br /> ESA,METI,Nq4;GEBC¢,NOAA increment PCarp, , <br /> Figure 6. Designated critical habitat for the Colorado pikeminnow. <br /> Critical habitat is defined as specific geographic areas,whether occupied by a listed species or <br /> not, that are essential for its conservation and that are formally designated by rule. In the <br /> Colorado and elsewhere,many of these critical habitat reaches overlap. Critical habitat for the <br /> humpback chub and bonytail are primarily canyon-bound reaches,while critical habitat for the <br /> 31 <br />