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-?rer invertebrates <br />region, and then <br />teat Valley warm <br />and secondarily <br />of water beetles, <br />•, all of which are <br />"a Historical Times <br />rmnidae <br />rmedius) <br />rr Cyprinidae <br />rani) <br />-nt velifer) <br />is pratensis) j <br />•xodontidae ' <br />i <br />liver System <br />qr Salmonidaes <br />Cyprinidae <br />ftQiidae 1 <br />c <br />wehidae <br />1) 1 <br />M <br />IVE t <br />8 percent of the <br />herder of Nevada <br />* and specialized <br />FIS$E9 AND F181JER1ES OF NEVADA <br />fish fauna to our area. Flowing 111 <br />regions of little but flash drainags <br />tributari lnt hthis as but ttko through semi-arid <br />es-the Virgin and .1[n <br />oaa eRivers rmanent Nevada <br />The largest of these two, the Virgin River, heads. in Kane County, <br />Utah and flows west and southwest, crossing the ti <br />Arizona and terminating t <br />p of northwestern <br />River, tiny by comparison I e fins tolflo?vun Warm Nevada. The 1bloapa <br />Clark County, Nevada (onY the course of the Pleistorx a `V hiqte River) <br />, <br />and originally entered the Virgin River about - 0 miles downstream <br />s? i a t ?? <br />1 •?i 6 ? -_ ` Fry <br />• _ ^ <br />V. 4V <br />J_ All, <br />1•'ra.l7, Colorado ?' _ fr <br />River, s <br />hmkinr north just above p <br />the- VP=PP <br />Ill 111'37. Photo by resent ,Rite of T)av <br />Uiuu. ('lurk h, author. Ruthor, as what the unobstructed river lcxrhed like <br />trom Warns Springs, IIowever, t}1Q last five miles of its (purse are now <br />111r1rtdated by the Overton Arm of Lake Mead, into which both the <br />?•irt. xnd %[oana Rivers empty. <br />Lirrurolog <br />Nevilda horde r-al ? os 110 1011 <br />a <br />,.er exists as riser along the <br />hannel, which was c <br />lartnnrroty c•xrions, is now ocertpied 1>uttp tI)lqlilld hrough <br />two <br />etttntnt•ed,uus, 11ic' first of the y reservoirs backed whs se- llOover or Rortlder Dail, built at the <br />1?'k?,•t,'.F t+'hi on in th deep, <br />to Black hicks Ciure 1930x-impounds <br />some 25 miles into make Mead (Boulder <br />:lriutnx. <br />I)'tt1l [)tint, farther sunth near the extrenn' tin of the St <br />Of <br />i1t•ir' , forms <br />lps oJlnhxvt• which reaches to the tailrace of hoover Darn. C'hxraeter_ <br />these two va ate <br />`?•fIx lakes, <br />st reservoirs will considered ill the section on <br />Tht•711t• only tutiuuttdated part of the be Colorado River in Nevada, that <br /> <br />4