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<br />Wc5THI'l BOL'ND.t,~Y W.t,TER BULLETIN 1<:)"/'1 INTERN.t,T10NAL BOUNDARY AND WATER COMMI!.SIQN
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<br />FOREWORD
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<br />Thl~ bullOlLin 13 thOl twenLI~tn annual cOlllpllation of ,trealll d1,cl1argu end other hydrographic data re-
<br />laU,1jj; tc !l!l!!':'llallMell.llpllcta or tne Colorado River below Imperial Dam, the Tljuana HVOlr, and other ,treafU
<br />oro~elr,g the ~stOlrn land'bound.ry of the UnHOld State", and l'Iedco, The oompllation wa' Drepered jointly oy
<br />the U.dted States and Hexlcan Section, of thll Tnternat10nal Boundary and Water COlIllIi"alon, "olely for th.,
<br />purpose of prennLlng ,tat18t1oel data rOllaUng to "tream now and k1ndre<1 ~ubject'" for the Colorado Rlver f~lII
<br />l.perlal Da.IIl to the Gulf of eallfornla, thOl T1juanm River end lU 1l1lportant trlbutarie" In the United State,
<br />and Hel1 00 , anc1 o~ her IS tre&ES, : no 1 l.:d I r.8, tile Al;UlO !Ind New River'" wh I ch ero",,,, the Call forn 1 a-Be ja Ca II rorn!a
<br />boundary, and the Santa CrIJz Rher and Whltewater Dr.wwhlchcro"", the Arlzon.a_Sonora bOIJ"dary. Thl'" volUlle
<br />con~a I "" 1nror..atl.on for the rear 1979.
<br />
<br />StreatlgagLnaon the Colorado Rlver belowllllperlal Dam began In 1902whOln the ",tat1on at YUllla, Arlzonawn
<br />eat.abl13hed. St.ege record, WOlre obtained at ~hU IStaUo... froz J.~<l3"Y 'e78 unt1J flecf'.mber 1913. when It \13'"
<br />d1",oontlnued. Contlnuou", "trealll gaging on the Tljuana River and a" l",porunt trlbutarl"''' in the United Statea
<br />and in HU100 began In 1936, Eachgovel'TllO"nt operaLe" th"gaglng ",tat Ion'" looat"dwtthln 1tsownCOWltrr.
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<br />Colorado River below Imperial Dam
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<br />BUow Talperlal DellI, the Colorado River flow, southward 10 ",l1e", to the mouth of thll Gila Rlv"'r, thence
<br />westward 11 ..ile", to Pl1otKnobHounta1n, and ",outh 11lI1le to the polnt wher" the northerly InternaLlonelland
<br />ooundary, betlleen Caltrornt. ""j &Jd c.l1rf].~...!a, Int~rsPol'" th~ river. frotl th1" point the river oontlnue", to
<br />now ~outhllard and rorm", the boundary betwee.n the Un1t"d Stat!!'a and Hulco for a distance or about ~2 a1lln to
<br />t~Ol point .mere the ",c.ut~erly international land boundary ~etween Arizona and Soncra Inter5~ct8 the river.
<br />frClll thl'" point the rlver contlnue, to flow "outhward about ~Oml1e'" to dlschargOl Into th" Gulf' of CUHornle.
<br />
<br />Th~ ordinary fl0V5 of COl"rado River ~Uo"' Dapel'1al De.. a/'t! :"r~ly "ontrclled vy 1'001e.&.'Je.'J at Hoover Dam,
<br />cOalpleted In 1':135. The relea,e" are I'\Jrther regulated at Davh Da"" oo..pletlld In 1950, and by Parker and
<br />l"'perlel 18"", completed In 1938. Salall UlOuntS of runoff tlay occaalcnally bOl centrl~uted to the flow In the
<br />10"",r river rroal theulluallydryal'royo"'dralnlnllthelO,900"'Quare",lle",alongthllrlvert'ro..Hoo""erD&.IIlto
<br />the .mClutll of the Gila RIver, In addition, flow"rangln,gfroau,uallyllLinoralllOunt,tolnfr-eQuenttorrOlntlal
<br />flood" ",ay enter the lewer Colorado River frolll the Bll1 Wll11a~ RlvOlr draIning ~bout Hi ",quare lII11e5 be;o~'
<br />Alamo 011'" and Lake, cOalplHe11n 19&3, and r~mthOl Olla River, draining about 7,300 SQual'Olmlle, belc... Painted
<br />Roclc ~tllInd ROl"ervolr, cOtaplfltlld In January 1960.
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<br />H r",p"rLB2 De_, d!,,"ers1""" are OIlIQllto 011a Gravlty Haln Canal and Ul-l,Joerlcan Canal for lrr1gatlon
<br />project" In Arl:zona, lnoludln,gthOl!u",aValley, GllaandW",llton_Mohawkpr-ojecU; and In California, including
<br />the Imperlal Valley, coao~ella Valley and Re"ervaLlon D1vt"lo~ of Yu... Proje~t. Uao, under thOl Pl"o""I",lon", of
<br />the 1?~~ 'oIatOlr Treaty, there ....y be diverted to the UI_.....~rlcan Canal at llllperl..,l Dem ror dell very to Hulco
<br />in th. AlaalO Canal, 01' ",ub"tHute canal, at th~ northerly ~oundary, a portion Of MuICO's gwiranteed annual
<br />allollaent of lIaters or the. Colorado Rlv.!l". ~o auel: dl ver.'Jlc.~" ""1"" Iud" 1n 1919,
<br />
<br />Balow Laguna Dalll,"'"a",urOldandunmea",u"ed flo..", pre returned to the rive r prlnClpally a" waat"'.nd drain-
<br />agl'l water frClll th" lrrIg..t1on p~jeot.s In the United Slijtn. Waste end drainage water, fro'" Irrigation
<br />projects In the Unlted State", abooro",,,, the boundary lnto He.lco near San LUi", Ar1:zona without r",turnln,g lO
<br />the r10ar in the United State~,
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<br />In thl 1111Litrophe ",eetlon of the r1vOlr, 1.1 IlLile" do""",trea,,, frolll the northerly boundary, Morlllo~ D&.II, the
<br />prlnoipal d1ver",lon nructure fGr Helie", ..as cCIIlpl"ted and plac~d In operat1ol1 on November B, 1950. SInce
<br />tbllt date Illllo"t all the Colorado Rlver fl0'0l3 that ere,,, thOl northerly boundary (e.cept elllergOlncy del1verle~ to
<br />T1juana beginning 1n AUgLJ"t 1972) have been d1vOlned to the Al4llloCanal at Horelo"'Du.
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<br />Tijuana River H..in
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<br />ThOl total dralnegear",a o(th" Tljuana River bU1n Is \,711 ",quar"'1II1Ies, ofwhloh27 percent 11eslnthe
<br />United States and 73 perCOlnt in /'le.ico. Tht" r!vOlr I' rOf'llleJ by tl:e ;II'Jncl;1a1 tr-1!:rutar!e."l, C~ttonwood Creek,
<br />..hlch rises In the United State", and Rio de la, Pal ala"" which rl~e~ In Hedco. Cottonwood Creek cro~'e" the
<br />internatloMI land boundary 21 ",11",,, from the Paclf10 Ocean to join the Hio de la~ Pal",a", in Mex1oo. FrOlll the
<br />con fl u"nc.. ofthe",e tributaries, the TIJuanl. RIver flow,northwe"terly5..11e ",tocro"" the land boundary Into
<br />the :.Jnle~ Statea ...ellr Slim Y.'JJ<:!,.", C.'JUf,,""'la and T1juana, El8Ja California, and then flail'" we",terly 6 1Il1l~~ to
<br />11"charge into the Pec1r1c Ocean 2 1lLi1"", north of the boundijry. The flow of Co~tonwood Creek is parllally
<br />conlrolled br Barrett and Hor!!'na Relerv<Jlr"'1ntr,eUnltedState",an1theflowortheRlodeleaPalm"."I1a
<br />partillllycontrolled by RodrIguez Re"",rvolr In He.lco.
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<br />Whitewate.. Ora. near DOUil... Arizona
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<br />Whitellater Drall r1"'II'" in the United S~te'" and nOli'" ,outh Into Hnlco, cr05~lng the International bound_
<br />ary n"ar Dougla", Arizona, eventually d1"charglne Into lhe Gulf of Call!ornla through the Yaqui Rlver In
<br />H",xlco. The total drainage area above the Douglaa Gaging Station I~ \,023 square 1Il11e",. A number or ",ounUin
<br />"trOl"lll.' In the upper r~aohe" or the ba,in ar" d lve..ted for Irrigation, bul th"y would nor",ally ...Ink or go to
<br />ground wllter before rellchln,gthe a1Un ..ater ~our"e,
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