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<br />Table 1. Sampling sites and sampling frequency. Colorado River. 1994-95
<br />
<br />\WCc~\y 'Jlinll~ 'Jrnf1k~ l"ollccIl'lI July I'JY4-Nu\'cmh.:r Il}l)4: 1ll01llhly salrnllY ,;ullpk's colb.:IL'u July 1l}l}.J--
<br />Scp[cmhcr 199~1
<br />
<br /> Site USGS
<br /> number stafion Sile name
<br /> (fig. 1) number
<br /> I ()<}U95500 Cnlor<luo River IlCilr CillllL'O
<br /> , .19062210H2(J."4()(1 Colorado River ;Ill'dll',;llk
<br />I'.~ (NI061~O Color;.u.lI) River /"Il:low llle Graml Valley
<br />~ Canal di\'er\IOl\, (\,,:;\r 1';\li~OIde
<br />1'\:,- 4 VIOJ I X IOR27.'2I)() Colorado Rl\'cr a[ .l2 Ro;ul. ncar Clif[on
<br /><.v ; (1I't06"lOO Colmado River a[ C,ranu JunctIon
<br /> " )90521 roxn.1J()() Colorado RI\'cr <II Rl'Jl.uu.h ParI; way, nC<lr
<br /> Grand Junnion
<br /> (}l,lISJOOO Colorado River a[ Fruila
<br /> H 09lhJSOO Coloriu.Jo River near tile Culorallo.Utah S[ale
<br /> line
<br />
<br />'Sampling only through ^prll 11I4:'i
<br />
<br />Monthly Variations in
<br />Salinity and Relation to
<br />Streamflow
<br />
<br />Munthly w<llc( '<lmples werc t"ullct:lcd at
<br />CI!!hl ,ill" (lahlc II ;lIId ",'crc ;lIwly/cJ for
<br />,.limny. Bel".IU\e 111,1I11hly ",;ullpk, wcre
<br />elllleCled al '" 01' [he l:1g.ht ...ite, allcr Apnl
<br />1495. the t'pllowlllg an,dY'l' i... h:l,ed on only
<br />[htl,C '" 'It'~' (I. '\.. ).6.7. ~IlH\)-;) M\llllhly
<br />~altnily d:ll;1 ,trl' ,llllWI1 ill ligurc ,
<br />
<br />Slrr,lll1t!(\W had ;1 prOl1llUlll'l:J cfk..:1 till
<br />.,almi[y Illllic C\lh'r,IJo Rlvel III It)l)-l :Jnd
<br />ll)l.,l,'; In IlJ45.IIlL' runoft 'e;l.,on wa' la[.:. <lnd
<br />high ~lrrJml1(,\~ wa~ prolonged well illlo tile
<br />..;ummer (hg 3J S[fl..'all\lluw 111 May 1995 al
<br />"lte I wa~ ol1ly 61 percenl or ,he ll1ng-term
<br />average (1934-9.H, hut slreamflows ror Junc
<br />Ihrou,&h Scp\clllher W~tC mud' gH~;>'\'i:.~ ~In'd\'\
<br />long-tcrm :I\'cr:lgrs rri~ 2) For t:'o;,i1lllplc.
<br />slrC~JnlfhlW HI July 14Y5 Wil~ 7lJJ pen'::elll ~\I
<br />Ihc av.:ragr July ~trt:amfl{lw lor I <JJ4-t,l4. Al
<br />~i[e H. the ,Ircamflow for July w;>.s 3QS percent
<br />of [he ;lvcragc J\lly strt::<lmnow for 1951--9..t.
<br />The hi~h :-,\I\:amlh)w In the h<l_'lll c,-H1.\ed <I
<br />large dc:cu';I,e 111 ,allnilY al Jll SIIe... (fig J)
<br />when cnrtlpareJ {(1 1444. The ,amples having
<br />large~l dillercnlc., in sallmly were collccted in
<br />lull' 'afl~ r\\l.~"h\'. >',),\m\\)' \Va... mw..:n \oweT Ifl
<br />199,'; Ih<ln III 1'14..1 al <III SJ)\ \11t:S. High stre<lrn-
<br />flow in 1945 dt-..u e<\us.ed ":.llinl\y among siles
<br />to be slIllllar unlll early September. when the
<br />elfecl~ of TUnDff wen~ diminlshillg
<br />
<br />In gel\eral. ...allnity in tht: C()IOJado River
<br />IS inversely related 10 slrt::amf1o.....' (hg. 3).
<br />Salinily rcnJ~ [ll tle higher al tow s\reamRow"
<br />and IOWCI ill hi:!h ,Ircamtlows Howe vcr. Ihl:."
<br />dTecl'~ (If ...ltC;lml\(1w on salmily mi~h\ depend
<br />to o,;Ol11e degrcl' on the IUlle or Yl..'<lf. Salimly
<br />\\'u:<. h\~ht~"" Il'f \lleS down,ln:<llll frlHn Ihe
<br />Gunni"t11l RI\'L'f (";It!:.. 6.7. and Xl dUflng
<br />
<br />Sampling
<br />frequency
<br />Weekly Month\Y-
<br />X X
<br />X XiI!
<br />
<br />x X
<br />X Xlii
<br />X X
<br /> X
<br /> X
<br /> X
<br />
<br />l'U~u_'I-NIl\'cmher ItJ9-1 lJig .11. wlllch l~ [he
<br />liJller tHle.h;tll 01 thc Irng<llion "'C",(\l\ In Illl:
<br />GranJ ViJllcy. After carly NovL'mber. thc.:rc ....
<br />,\ tkl'rc"...c in lfr1!;,l1lpn rl'[um 110w.... and ,alin-
<br />Ily dc.:crca...cd al...ile, o. 7. and~. Dady ~lrCilll1-
<br />111,..... ,II Ihc g~\gJllg 'lalioll al "ill: H Wil' l(1wC'1
<br />In Ihe 'Iudy pcrlod (hll)' 199..t-Sl'plclllher
<br />14l'-'I' during laic July and carly ^ugu'l 1(14-1
<br />.Irld dill il1~ lkL'L"lIIhl.'1' 11)1)--1_I'd1fll.1fY I <)l)'\
<br />Thcrct'ulc. IhL" hJghe,1 :-.allllll)' ,II 'lit:' (1.7. ;Hld
<br />
<br />20
<br />
<br />R dill nol always occur during the lowe\(
<br />'ilreilmllow<;. Thl' highcr "iJlmi[y in ^ugu<;[-
<br />November ltJ94 for siles 6.7, and g probJbly
<br />W<I, l.:<tll.....cd hy mcrc<l,ed .;all loadillg hI tile
<br />rivcr from ,1lrr~ll.:e ,-IllJ ,uh...urt'i1lC Irrigtltllll\
<br />relum flow" Juring Ihe 1;lller pari of [he irrig:t-
<br />[1(111 'C<l~UI\_ III l:\\I\\[;I"" hl <.;1Ie" h, 7, ;lIld:-\. Ihl:
<br />hrghe"'l s<llinity for \I(t'~ I and .' oU.:urrcd duro
<br />ing Decemner-f-chruary whcn ,Ircarnllow Wit...
<br />ill a 1Il1[\IIlJUnl. Salinily a[ s[le I would /lol ne
<br />aft'cc.:leJ hy lITigatlPn drainage f(om Ihe Grand
<br />Villley, and the effec[ of imga[HlIl drilinage at
<br />"ile.1 WaS mmimal
<br />
<br />Weekly Variations in Salinity
<br />and Relation to Streamflow
<br />
<br />Salmll)' for weekly sample... colleeled:ll
<br />...ilc, I-.'i ilrc plOl11'd in figure 4. Generally.
<br />\h..:w 'W',).~ a ~f<ll.\\l,l\ lIKIt.'Ol\e lr'I ',llini\)' ,1\ each
<br />....IC 1f(11l1 July IlJ44 \(l Novcmh~r 191)4 ii'
<br /><;[rcalllllow gI'dduaJly decrca\ed. Sallni[y Itlr
<br />weekly ....ample, cnllet:lCll In 1994 wao;, o;,\rm~"'~
<br />alllong .'lIe, 1,2. and .' (jig. --lJ. Salinll)' at
<br />'lle.\ 4 and 5 wa.~ ctm....rstently hIgher than al
<br />"ltc, I. 2, af\ll .\. an~t ",dimly <I' ...He 'I ......a~ L'~l{\-
<br />...i~tel\llv IHg.hl.:t Ihal\ '-ll "ile 4. The inne<l,e III
<br />"ilJl1ilY al .'lle" .1...t, and 5 In a d(lWn\lrl'Jnl
<br />dncllioll plohahly i';1 rc,ult III 'urLJ<..'c awl
<br />'lJh'urLKc Img;Jlion (C(Ur'n f10W\ In [Ill.' flveJ
<br />
<br />. MONTHLY A.VERAGE StREAMFlOW, WATER YEAR 1994
<br />. MONTHLY AVERAGE STREAMFLOW, WATER YEAR 1995
<br />. AVERAGE LONG-TERM STREAMFLQW. 1934-94
<br />
<br />
<br />o ,"
<br />z
<br />o
<br />u
<br />m 16
<br />cr
<br />w
<br />Q
<br />~ 1d
<br />w
<br />w
<br />~
<br />U
<br />CD I?
<br />:J
<br />u
<br />o
<br />o
<br />0. 10
<br />'"
<br />,,'
<br />o
<br />~
<br />~
<br />"
<br />..
<br />w
<br />cr
<br />~
<br />if>
<br />>-
<br />~
<br />I
<br />~
<br />Z
<br />o
<br />"
<br />
<br />B
<br />
<br />6
<br />
<br />,
<br />
<br />2
<br />
<br />o
<br />
<br />OCT
<br />
<br />NOV
<br />
<br />DEe
<br />
<br />JAN
<br />
<br />FEB
<br />
<br />MAR APR
<br />MON TH
<br />
<br />MAY
<br />
<br />JUNE JULY
<br />
<br />AUG
<br />
<br />SEPT
<br />
<br />Figure 2. Average monthly streamUow for waler years \994 and 1995 and long-term
<br />monthly streamflow for 1934-94 10f the Colorado River near Cameo at gaging slahon 09095500
<br />(Slle 1 in Ilg 1)
<br />
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