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<br />.t ~!AL :TTO;1IE'""
<br />
<br />3. Lake ~'!ead
<br />
<br />'l'he Eureau ,f' 'ecl3..":la:ion c'JnJ1;.~f'. ~'ln ~. ~r.zi'lP -!u~ui :::amplinl'
<br />pror7rn:n of Lake ~"~ad I'r':lm 1 .;4 t!,,?"JU,~! 1,. ~s !!HiT., ~ ;:t.ations w,..re
<br />sampled in '_h~ .::;.r1n8 and fall. ~ef::",s ...-err r:mdr: (''Or ii;:~->lvo:"d oxygen.
<br />carbon dioxi<:ie. pH. alkalini t:r. -"er"'r.~r!'l-:ur(. c':'n.-1'~": \'1 "-. . /illrl turbi1::. ty
<br />~t sele.:tc-] depth" at esc:: :; a't' r:. .,o.'.<Jtf'r sa'!!pl,"~ .l<:!!'r> ,ttain"'d ...:",,~
<br />selected 1epths for lab ;ruto~.f !l.."'wlysi." ~.0r ealcic;:.:. ma:m",sitL-:, ::;0.1i .un,
<br />pv-:assium. carb"'nate. bicarbonat(. sJ.l1'!:.r~:,., chlorile. n.tra~'? phos::,hate,
<br />electrical. ronduc'",i"lity. t-,tu 'li~' "lved ::oliris. a."ld r; J'he rr~u1ts o-f
<br />these inves:ij~atilns ....er~ ccrrcl":ltprj "./'it" the sfJ....~:plin,- ~t'l;tion ...~ I~,cyer
<br />Dn.":l -.mere .oonthly wate!' a.~a.lyses 0:' man:! ~ the,;,!;' :'act rs '.'l.':e L'~cn ~ade
<br />for =ver ?O yea.r~. "'l-;~ 'ht'l cl)l1ect~d fr'. "':.'.'-. sanplin,- PI' '^"!'a"l'l!urin8'
<br />'the period April l' l thr,ugh ;hve~t"r " ....er'- pubIi.shei in ~:)rt No.
<br />CH1::-70. "':ater<<:uality '....clcfy f' Lake ."-ead, ~lovemb"'r 1 ,.'7. Rureau of Recla-
<br />mation, nfC'nver. ro'-'llornr.io. This rep0r"'- ",.rjS r.;opr in"-_ in .p::-il ll)70 ....i t!'!
<br />!J"J.nor revisi~ ns.
<br />
<br />This report 'loc~ent:': -:-,he efT,,;,.
<br />luality 9J1d the ir.tpr:JVcm~nt of luali;-
<br />l~e follcwinr tr. ini~ial f'illlne f
<br />
<br />f the I'L-duc<:>ri t:lfl )"'.. ::m ....-ater
<br />wi~h Increasei in~low tn ~he
<br />!"n.ke p)'Wpll.
<br />
<br />Th~ reper: jisc~l.';se.:; t.hlO lirenol::,>e~c:ll ch8.1'~ct~ristl.c", La:":e ~"ear1.
<br />The annual temperature cYcle nf Lnke :'!~1,j: classi!'il>u as ...arm !llonomic_
<br />tic in that the "'-.e::Ipcr1\ture is never b~] ~,..,. 3".?' .. '.ll1deri"'oes circula_
<br />t-'lon durinr the '.."inter. .<md Is 'lir~c-:l.:{ "tr'ltif"ief1 in ::h'" s;J,mrr:~r.
<br />
<br />There is ~~ increase in ~npral ~ontpn~ f'ro~
<br />end of Lake ~"I>nd ..1.th ';.he ,;reatesi increases bein~-" in
<br />rUes of cal~ium 'Uld sod.iu.'ll. The ~nl2/ d( C!'~ase n ';ed
<br />bonate vatU!?s.
<br />
<br />i.lp!)f~r to th€> lO'..-er
<br />3~llpbates aJ'ld chlo-
<br />HHS in the bicar-
<br />
<br />r. is expect"j that th type of !;o..":!fLn,- ..,ad" -IU!"i!1~; this sur-;ey
<br />..."ill beo r.:,peated at appr:'.priate inter'.'9.1_::" in tl:~ future.
<br />
<br />L.C"ner Ccl'Jrado:"
<br />
<br />iVer Salinity :nv~s+i~8ti~!1s
<br />.
<br />
<br />'..ta.ter :;.unli~~y smn-pIes 'il" oe:='nt:. .llect ~ rI1":'lj., .'.)n:.hl..v. or
<br />'luarterly fro~ approxi=la-':.~~' 1')0 <:itee '1:. ':.ne riVers, canal~. irains,
<br />:md sl:>ug.~s by the Bureau ,f Rec1!l:l':ativn 8.r.d b'" ....~'.:'~eal:..,f"ical '";ur-...e:r
<br />for the Bureau a!' Recl8.:::Jation in th~' 1~pp~r"'01'"'r"l'i =-:-n~r ?:asin, This
<br />prof7aI:. is ir. additicn ...:- th(> !'eg-..u.a.r ;".,'L'gical . \:!'vey net\of':Jrk. Sa.-:ples
<br />are cGllected s.~ variou~ l,-:"ca"-ims :~-~r "':-..-., J;tL.j)0S" ,:)f-"-.a2.U3'-,ing e:-:"ects
<br />n'" "'-::ure ....-ater !'es<:mrcc ;Jro,.1ect:::m ",:::;,- river syste."!l. identi!'ying sources
<br />of salinity f0r ~a'ter q~ality improve=er.:. nroJects. obtaini~6 basic lata
<br />;:(Z' researc: nr<:>'ects. and a.cq-.:irin ;nr.r-"':err.l rec:->ris :"1 1ete~ne trends
<br />and observe 'yerall chanfes in '... salinit:,. .... "':-, riY0r s:,'stem. This
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