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<br />\I>[STERN BOUl'ID~PJ WAHP; ~ULLETI"J l?~(, lIiTERIJATlGH'IL BOUI-W'IET NJD v-."TEP. CO"'MIS~lor-i
<br />
<br />FOREWORD
<br />
<br />TlJl" bulletin 1~ the seventeent,h IllUllllil cO",pl.lalJ.on of ~tre/:LlO discharges Illtd other h:;drogroph1c dat" re-
<br />lating t.o the lnt.enl9.t1onal aSp""ts of th~ Colorndo River belov lIapertal DcJIl. the Tlju"-IlJl. River W1J. other
<br />strellJll!l cro~~ing the ve~t.eru l"nd boundalj' of the Un1t~d. St"tei End IoIcxico. The co..pil"tion V!lE prepu'ed
<br />joint.l:; hj the iJn1t...d St6t.es and. Mcxkan S~ct.10l\8 or th" tr.terT.at.1onal fu\jnde.ry snd IJ..t.er Co<lllll1s~lon. 501.,11
<br />fo~ the p..1rp.J"e of pre~ent.1ng stat.1st.1c"l <iHt.a relBt11l1l to st.reD-lll flCl\l and kindr~d lIubJect~ for the Colorn.do
<br />R1ver fro.. I<cpt:r111.1 DaIII t.o t.he Gulf of Call1'Ornlll, the 'I'ij<JllJ1B Rlv~r and 1to lllllX'rtent tributaries 1n the
<br />LIn1ted. StBtes end K:;dco. IIndothcr strea.m>, ir,clud.ing the AlbOl) bnd Nev R1verD vhlch Crtl05 the Cal1fvrn!a-
<br />BaJII.Ca.l.1forn1a bounder-; , bndthe 5at.to Cruz River ondlJh1t"'""'-t.cr Dnlll "h1Ch crocs the-Ari:wfIB_SOMI"8 boundar,.
<br />Thl~ volume cont.sin" t.he 1nforlllllt.1011 for tohe :;ear 1976.
<br />
<br />:'>tre'lJll g11g1ng on the Golo",,1o River below l.rn~r1al Dn.m t.egan in 1902 vhen th.. st.atlon '!It. 'tWllll, Arl~ollll.
<br />.....~ est.bl:.lI~hl:d.. StB8J' ",cord.6 liere obtained et thio :;t.at1on fro~ JIl-JltL'lry 1378 until Pec"-lllb"r 1973, "hen 1t
<br />.....s discontln'J..d. Cont.1,"uous 6t.J"eblll gflOIlll on the TIJtL'lno River ond i t~ 1al1X'rte.nt tribut.srles in the United
<br />Stbt..a !llld 1n Me;dco b"g'ln In 1036. Ehch gcvernJllellt op"l"Btes tohe ge.g1n,g ~t.Htio"" 10"bted "itl\1n its OVIl
<br />count.lj'.
<br />
<br />Colorado River below Imperial Dam
<br />
<br />BelCl\l lmperlel D""'. th~ Gol'Jrudo Riv..r fl(JI/6 souttr.larU 10 .IIIlle~ t.o t.he mouth of the GU" River. thence
<br />"..:;tIIard 11 III1le~ t.o Pilot Kr10b !obunt.IJ.in, sact ~outh 1 mile t.o th~ polnt I/here the aorth..rly 10terne.tloMl. 1",,"-
<br />boundhlj' , be Ween C~Ufornlo I1Jid Baja Celifornla, Inter~ectt. the river. from thl" p;:lillt the river conUnu!!s to
<br />1'l[JII sauthllnrdand fer,"" th..boundary b..t"...." the lJn1tedSle.tesan.i Medco foro d15tll-Jlceofebout 22 mil..s'W
<br />th.. p:llnt. "here t.h" ,outh"rl:; Il1ternot.l01'lbllan.:1 iJound..l1ry t.et.Veen Arizone. sndSonore. inten..ct9 th" rlv..r.
<br />Fro.. th1~ p;:llnt the dv~r canUnue8 to flow ~O\Jthva:n1 e.t.O\Jt 90 lIl.11es to <U~che.rge int.o the Gulf of Csllforn.i...
<br />
<br />Theo:rd.J.ilaryflovsofColorodoRlverbelovImpel"1"lP'lJIla.....largelycontroUedbyr..1..ase9 e.t Hoc>ver [l!.nJ,
<br />co..pt"ted In 1935. The rele..~"~ s~ further regulated. ..t Davis D"-IIl, co..pleted in 1950, alld by P"rker "nd IOlo-
<br />p"rial D8m:i, compl"t.ed in 1'139. S-ll B40unts of runort l!I."\;{ o,co~l"tl!llly b.. cont.ributed to the flov In t~
<br />101l..r river fro.. the USLnUy dry srroYOl'i d.nllnlng th.. lO,ClOO 9quare ",1l..~ 1l10ng th.. r1v..r fN'" flc>ov..r D"-'" to
<br />th.. m:luth of theGlla River. not Indudlng5.500 square JIlUe5 inth"Blll'JUl1~ Plv..rllalenhed. Inbddi_
<br />tIon, nows l"Bn~ng froJll\lsU'lUy 1II100r amounts too lnf""'quer,t torrent.1al flood~ ""'i "11t.er the lCl\ler Colore.do
<br />River fro.. the BUl IJll11slD5 River e.r,d fro.. t.he GUa River. In.!nlng about 7.300 ~quare ~U..s t.el[JII Mnted
<br />Rock D"'" ar.d Pe~ervoir. cOlllpletcd in Jllnual""; 1960.
<br />
<br />At Imper!sl D'liII, rl.lverslons are IIlIIde t.o GUll Gre.v1ty M.'1in Cb,,,,l and All.-AIIIer1~1l-Jl Canal for lrrlg!l.tlC>D
<br />project" In Ar!z.x....., in.cludlng t.h..YUIIIH Vllll"y, Gila llnd IJelltoa-tobllallk projecU, and lr.C"lifornlll, lnclud.ing
<br />the Imperlsl Vall"y, Ct;bch..lla Valley end Re~e......tlon Dlvillion Of YUIIIb Project. Aloo, under the provlslons of
<br />th.. 1944IJaterTre"t;,., th.......lIlB:;be 'liverted to th.. AlI_AmerlconCanal8tIm~risl DEIIlIfordel1v..lj' tololcx.1co
<br />in the AlsO>] CaMl, or ~ut.st1tute c"nol, at the nort.herly hO,"1de.ry, " jXIrtion of Mexl~o'~ guN'llnt...ed ..r.nual "l.-
<br />lot_nt of Vll.ten of the Colonda River. !lo su~h div"rslons "e,.." IlIEIde in 1076.
<br />
<br />Bel-:rJ .L8~ne. P,,-,", ,""o9ured bnd ll.f\llleEFUI...d fl"." ere returned to the river princips.lly e~ "&st... 1100 drain-
<br />Ell" lister fro~ the lrrll!jl1.tion PNj~~ts In th.. LIn1ted Stetes. \lest" 1:<00 dnllM8e "ot..r:; fr~'" irrigation pro-
<br />jecth ill the United St"t..s also ~ro~~ t.he bOlH.dal""J into Me-:<Ico ne"r Snn Luis. Arizono 1/1tl'out returnlll8 to t.h~
<br />rlv..r in the Unlt~.1 St.ates.
<br />
<br />In th.. 110lltroph.. ~ect1on of th.. rJver. 1.1 mile~ d.OIIn'''.....ll.lll frolll the northerly bourulary. ~relos Da.<n,
<br />the pr1n~1pe.l d.iv..nIon ~tru~ture for ~"Ic<:l. lI11s completed end placed In opel"llt1on on November e. 1950. Sin~e
<br />thot. d..:J.te B..l.:lo~t [1].1 the COIOI""lo Plv~r flows th9.t '~ro~o th.. nenh..rly boundJJ.ry ("xcept e,""ri!ency dellverl~" to
<br />Tljusm b..g1rm1n~ in Augu~t 1972) have b..en diverted to th.. AlanD Cawti ht tobreloa DM.
<br />
<br />Tijuanll. River 8a.in
<br />
<br />The totlll drel""ll" ..ree of th~ TiJuanu Rlv..r ~""ln 1'. 1.731 s'llUJ.re miles of I/hlch 27 pen:ent lie3 in t.h..
<br />Unl ted :::;t~tes and 73 J"''''ent I n Me.l~o. Thi~ rlv,",r 1~ fOnll..<1 b:' the prin.:ll"'l trlbut.Hrles. Cot.tonllood Creek.
<br />1Ih1.:h r1s..~ io th~ lJnj t..d St"t.es aM P.io d" l[l~ Paln<s. llhich rises ill Mex.1co. Cotto",,()()d Creek cro~ses the
<br />Interns.t1o""l bod bouru1Elr; 21 m1.1es fro.. th" Pu.:If1~ OceBn to JOill the Flo d.. llls P;).ln<5 in Mexico. FNIll the
<br />COnl'luen~.. of these trlbuttol"1e6. the TiJu~nn River fl(JI/s lIOrttIJesteriy 5 ",11es to ~I\J~E the lilnd ~oundl.J.rJ Into
<br />t.h.. United StJ;t.e~ Ml:<r S.U1 ~EIdro, Chlifnni", .n.! TiJUDM. B.j~ C"11fo,,.1a. and th~n flCl\l5 I/e~t.erly 6 llI1.les to
<br />diEch<lrae Into the p".~1ftc O~e"" 2 <Il11..~ nort.h of the bOllJld.sn'. The fl(N of Cottoncrooo Creek Is p"rt1ally ~Of'o-
<br />trolled by Ban..tt [\Od !-brefIB R..servoir~ in the United St.,te~ h,m the n"" of the- Rio d.e bs r-"llrfts 1" Plrt.l9-l_
<br />11 ~ontrulled bJ ROOrigu": Re~"rvuir In Mcx.l~o.
<br />
<br />Whitewaler Ora.... near Douglll.lI, Arizona
<br />
<br />lIh1te""t", Prp" r16ec. in the Ur,lte" ~tute~ ',JIll n",,~ ~outh lntc> Me-.dco ~ro-.r.lns th~ lnt..rnllt1,)n.ll bc>urut.._
<br />r,. neIlr Doughs. hri::OM. eventuallJ d1~cMrgill8 Into t.h~ Gulf of Cel1fornia t.hr:>ugh th.. 'taQui Riv..r in Mel<1cc>.
<br />Th~ wtal dnll""ll" ~re" obove t,,~ Dousl~l'i GLiglll8 Station i" 1 ,023 "'l,,,,re ",11"2. ;., IIllJ1ll>er of ""'LilLtS!" stre,,",s
<br />111 the upp"r re~che~ of t.he b:Hln ure d1v..n.~d for Irrigc.tlc>'.. but they ~ould no,-,,,,11:, ~Ink Or go t.o ground
<br />"",ter bel;)r" l-e&<.hino; the Ill" in ~'[lter <:Our"e.
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