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<br />/e> /::13 /7'-
<br />Salinity in the Colorado River in the Grand Valley,
<br />Western Colorado, 1994-95
<br />
<br />~
<br />GTS
<br />
<br />U.S. Department of the Interior-U.S. Geological Survey
<br />
<br />Salinity in the Colorado River i~ highly d~pendcnl on streamflow. In general. high streamflow dilutes salinity. and
<br />low streamflow increa'\Cs saJinit)'.
<br />
<br />Ex~cled high salinity during periods of low streamflow in fall' summt."r might partially be offsel by rescro'Oir
<br />releases in the- Upper Color.uJo River Basin upstream fromlhc Grand Valley.
<br />Salinity during the irrigation :-.cason did nOI exceed the 700-850 milligrams per liler threshold in the Colomdo
<br />River near the points of diven-ion for Grand Valley irrigators.
<br />
<br />. Irrigation relUm tlows (wm the Grand Yalley increase salinity in the Colorado River.
<br />
<br />
<br />Introduction
<br />
<br />. .....
<br />~"i.:",4'
<br />
<br />S;llinit~'''Tlh''l.h,,,,'IH''J..,,lid.
<br /><.:"n~',.ntr<illt'n, I. lhc nW:I.urc 01 .illh .uch
<br />a. .""hum chl"nJ'..<':;lkIUm hl.:Mn.'n,llc. and
<br />,.,t1,.iul11.ulfalclhal;m..JI.."[u.dm......lcr,
<br />:\n.'ull'nc-halt "llhL. .alinil~ m Ih,.
<br />Clll"raJ" Ki\','f Ba'lIl i.frornn;llUf:l1 ."un;,...
<br />ILI.S, lkrilrtlllent "I th,' Intcn"r. 1'1'J~1. ,"..h
<br />a. th,'ml,11 .pnng. in IhL. (;kn....""d-I),'hCW
<br />an~a.l<le.u,.d :lh<'ul 'H.t 11111.... ur.lr,,,,.m Ir"l1I
<br />Gral1d Junc!lllrl (11g, II. f-Ikd.o' human
<br />'I<:li\lli"...u,'h;l. IrTig;ulllrl.rc".r\"1I "\af"-'"
<br />ralll'n.andlr..n.h;l.mdlh'r,"'n..ha\c
<br />m'.rt'":I....d Ih,. k\cl- ,,[ .....Imll~ mIll<." C"I"rad..
<br />RI\Cf. Hl~h ',Llmll~ ~':ln :llk,'l indu,lrs;t1 .md
<br />mum.'Lp..1 .....,Icru-.cr."~ ,'au.mg lIl..rca.,.J
<br />wal...r-lr,.alm,.ntc'hl..ln.-r"''''''uu,'lcrioralulIl
<br />"fplumhmg.uul,II'Ph.lIl,'c'.lIlCl"l..""'U\"ar
<br />n"".u....ndundc.lr<ihk'I:I.lc"j dnnkmg....:lt'.r.
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<br />_~..._ .!lI"\lR
<br />;-;_ ''-./ {',,-40~>J>
<br />~~"".- \ '-..I ,\f""""
<br />~\.--.-...........'
<br />,,,1,,11\1>6--.....
<br />v -, .
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<br />Jllgh..,llml~ :I1",,',m,'au....h","crCr"I'~lcld.
<br />h~ r...uu<.:mg .... ,lk'r :lnJ num...nt urt..k<: h~
<br />I'lanhand...;mm"'.a......Igrinllluralpr"uu.'Il"ll
<br />,.".1.ht....au.'."thlgh...rlea.'hing.lnd
<br />dram:lg...r''''lulr...mcnh, Agri,.ullurall"........
<br />nll~hl ",:..ur \\h,.n 'alinil) re.l,h.... ,11'o.'ul
<br />7(O-~)lI milhgram. f"-:r hl,'r I U,S Ikp'Lrtm...nt
<br />"t the lm,'ri"r. 1''''.11
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<br />Thc Cnl"radn RII,'r" lh... m.LI"r ,,'UK'"
<br />,.1 Lrngah,'n w;lI<:r I" Ih,' Gr,lI1d Vafle~ llig 11
<br />;mJ;II,ol"'IIl".,'urn."j'llal,'rf"rlh,.Clltl"n
<br />\\',LleIDI.trI.'I."hIL.h.llrph,..J"lII'..li.......;ll...r
<br />tu rart <lllh,' ,'a'I,.nJ (,ranJ \',lIk) Dunng
<br />'rnng ,uhl ";Lrl~ .urnnll.r m I'JlJ.1. th,'Coh...
<br />raJ"l{jH'rmllwC,l.luJValleyha,II""cllh.ln
<br />a\cra~e 'Ir~',UTllh...... Tlwr,. ";1. l"llll,'cm h~
<br />"al..-ru......r-.an.'ullh...cth"'I"tlhl.I"" .lfl"UT1-
<br />tJ.." "ll.alinlly 1I1Ih"liH"1. IIlI'N.1.lhel'.S
<br />{I,'"I"j:I..al Slln,.~ Cl'SriSl. m"''''f'<:ralll'n
<br />"llhlh...C"ltlradoRi,...r\\.';llerC"lhcn.llll>n
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<br />
<br />EXPLANATION
<br />DIARIGATEOAAEA
<br />.4 WATER-QUAUTY
<br />SAMPLING SHE AND
<br />NUMBER
<br />
<br />1.
<br />.
<br />
<br />,
<br />
<br />,
<br />I
<br />,
<br />
<br />~ ....LES
<br />;.'lO"'PH'$
<br />
<br />Figure 1. Imgalt>d ,Ilea.n lhe Grand Valley and locations of samolinq slles lor lhe 1994-95
<br />saltntty sludy of me Coloraoo R'ver
<br />
<br />Ill.md. h...gan., 'lUJ~ I.. <:\alu.ll'" ,allllil~ In
<br />lh,. Clllorauu Rl\er 11". lad ,he,'l dc'<'nho..'.
<br />r,',ull. .,tlhal .lUd~. 111... 'f'<:nli~' ,.hJ'.dll~..'I!
<br />Ih... l..d 'h'....l arc. I" ( II <.:Ulllpar... .allllll~ m Ih~'
<br />C"I"rad" R.\...r among ullkr,'nt hleall""'
<br />tr"lll Carlll''' l" lh... C,~luraJ".( '1.lh SIal,' Imc.
<br />I!I;I......" \,Irialll,n, III .;lhmt~ lor Jitt,'r':lII
<br />llnll',"11he~":lr..mdtJJJ'.....nh.: th,.rdall<lll
<br />r.:1"'....Il.lr'.:lmIJ".... and ';ilinil~ inth,' flI'Cr.
<br />
<br />Sampling Sites and
<br />Data Collection
<br />
<br />Fighl 'II,.. "II Ihe C"I"radn KIH'f ",.r,.
<br />.'.[C..'I'....t"( "aler-,\u;lln~ .aml'ling, I.....'a.
<br />lUlIl."r.amrlmg'Ll,..ar,..h""lIlntigul,'I.
<br />511,. Id"'llllll~..,tu'lI and lo.:all"nJ,...'f1pll"n.
<br />,Ircl..l,.u Inl;ihk I S,Ul1pl,..",.r,'<.:"lk":leJal
<br />I...." tr..''lu..n.-i,.. \\"c,.kl~ ',lmrk. .......r'.c"]-
<br />1,.d,'J .LI .Ik.. I Ihr"u.!-'h) tWill July 1'1'4.1
<br />lhr"ughlh...lir...l"c....k"f:"ul...nll,,:rIIJ<I.1
<br />lI..hl..- 111"rdl'l,.mlin,lll"n"f,altnll~ Str~.Jlll-
<br />11"" "a.m.:a.ur,.Jalth"lInl<.'"r.alllpk
<br />.."lll','Il"", .\l"nthl~ ...mrk, ....'.r.. ....lk..t...d al
<br />..U...ighl 'lle\ lrum Jul~ 1<J<I.1 lhrough Al'nl
<br />I<l"j~. \l"nthl~ ';lIl1pk', .......r~. an;II~".u IIlf
<br />.alimt~ ;lnJ h.r ""n~'...n!ratll'lh "I ntajol i,'n,
<br />.u,'h.., <.:aklUlI1. magn""lUlll. p"l<L"ium.
<br />....'hUlII...:hl,'f1J,.. .ul1at<....IIlJ hi..:arh.>Il.llc
<br />In.rr..."...J a.,alkahnil~l. Ik,.au....."lh,'a\~
<br />.n"....p;l"k.lh,.re.....L.lh,.I"'I...lllla]f"rhigh
<br />,lr...amn"" In th<, C"I"rad" KIH'r nng runoff
<br />III 19'1:" Thl'r,'l<:'r,'. m"nthl~ 'amrftn~ "...
<br />,'"nllnu<'J thr"u~h S,.plcmhcr 1'1'4).11 .Lfl "I,..
<br />"'\~".pl .11.... ~ .Ind .1 Illgh .Irl,;tmtl,,\\ Juring
<br />.umm<:r ['1'4) pn.\ Id~.J.I nOI.:lhk ,','ntra,lln
<br />lh,'I"" 11"....,I'fliN.1 h'r"".Impl".alth,.
<br />gagmg.l,'""nal"1" lIC"l"raJ"KI\<,rn"ar
<br />C.iil1C,II. a\,.rage .lre;ln1l1"" f.,r Ju[~ 1""5
<br />\\;L.al'o..ul......\I..nllll'k.'.freat'.rthanah'rag...
<br />'Ir"emll!""., fOf Jul~ 1'N4 Ilt~ ~1. AlI.....II...r.
<br />,\u;\hl~ anJ 'Ir....lIlIl].'" J.lI;J <.:olk.....!<.J fur lh"
<br />.111J~ .Ir,' puhh.h,'J ml'S(,S ..nnual ,bla
<br />r"'r""' h.rCnl"faJnll'gl.lnd .InJ"lh...r..
<br />I'N,~. ('n'''I<'''t ilnJ"lha.. I<JL/(ll.
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