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<br />W~STERN BOUNO"R.Y WATER. BULLETIN 1978 - INTERN"TION"L DOUNDAAY "ND WATER C(),VMI~SION
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<br />FOREWORD
<br />
<br />Thh ~ull..tln 13 th", ninH~enth "nnu~1 COlllpl!aUOll of ~t~eam di3char8e~ an<l other hydrographic dau re~
<br />latirll; to Inte~natlonal a~pect~ or the Calorado River belo... Imp"dal Du. lhe rlJu~a Rlve~. and o~l1er 8~r~a"~
<br />cro~~i"S th~ we8tern larld boundary of the United State~ and !'Iexlc". rhe cOll.p1l.~lon wa~ prepa~ed J'llnlly by
<br />the United State" lll1d ~~lcan Secli<>n& or the International Boundary and \later Colllll11a~lon, aol..\y ror the
<br />purp03e or preaenllng atatl.atlcal data relaUng to atr..am Clow and ktndre1 aubJect" ror the Col.o~ado River rrolll
<br />Imperial Dam to the (;ulf or CaliCornla, the TIJL1ana Rlver and Ita Impor~ant t~1~uUr1e~ In th" Un1ted State~
<br />and Hexlco, and other atre3llla, Includl.ng the -'1&1110 ~nd New Rivera ...hlch croa3 the CaIHo~nla.Baja CalHornla
<br />boundary, I.nd t.,.., Santa C,-u~ ~!~er and lo'hltewllter D~a" ..hlch croa~ the Ari~ona-Sonora boUndar~. This volullle
<br />conl..lln8 inro""aUon for the year 1978.
<br />
<br />Stream g:>glrll; on the Colora~o River below Imperial Darn ~egan In 1902 ..nen the ~tatlon at Yuma, Arl~ona wa"
<br />eatabllahed. Stage ~e"orda w..~e obtaIned at this atatlon frOlll January 1878 untIl December 1973, when It wa"
<br />diacontinued, Contlnuou3 atream gaging "n the TIJl.L.&na River and l.ta l..portant trl"lJta~lea In th~ United Statu
<br />and In HU1CO began ln 1936. Each l$ooerlllllent ope~atea the gallil1l1 atationa IO~ated within Ita 01111 country.
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<br />Colorll.do River below Imperill.l DlI.m
<br />
<br />Below lllperllll OIIm, the Color~o" Rlver no..s ~o~th"a~d 101111".& to the "O\lth of the Gll~ "l.ver. thence
<br />weat"ard l' 1I11ea to Pilot Knob HOlJn~aln, and aouth 1 IRlL. to the Po:llnt where the nor~herly Int'l!rnaLiOnal laM
<br />boundary. bf!tween CalHo~nla and Baja CaUfornla, Inte~a(:ct.a the rlv.,r. From thla p"lnt the rlv..r contlnuea ~()
<br />now &outh"ard and fo....a the boundary b..tween tne Unlt~d Statea end Hf!I1CO for a 'llatancf! of abo:lut 22 ..llea to
<br />the point "here lhe aOlJthf!~ly 1nternal1'Jnal land boundary be~ween Arizona and Sonora inter~ecta the river,
<br />FrOlll thla p,>lnt the ~j.er conllnuea to no" ~"utl1"'l.rd ab""t 9:: ct:e8 ~"j~,,~hoirg'l into tile aulf of ('.aIHo~nia.
<br />
<br />The ordinary nowa of Col'Jrado Rl.v~r below Imperial Dalll are \a~gely conlroll'l!d by relea~ea at Hoover Dam,
<br />completed 1n 1935. The rel...aea ""''' further ~eg'Jlllted at Davl.& Da... co..plet'ld In 1950, and by Parker end
<br />I..per1&l Oil""'. c01llpleted In 1938. Small amounta of runofr ..ay occaalonal1y be c",,"rlbuted to the no... 1n the
<br />lower r> ver rrom the uaually dry arro~o~ draining the 10,'l00 aQuare ..Ilea along the river fro[ll Hoover Da.. to
<br />the ..outh <lr the GJ.ld R1ver. In aj.-jl tlon, Clow~ ranglng fro", ua""lly ",lnor amounta to lnf~'I!Qu..nt tnrr~ntlal
<br />flooda may enter ~l1e lower Colorad" River from the ,Ull li!lLt....u Ihve." dralnJ.'8 abe"l ,!17 .:!Qulre mllea bplow
<br />AlaIRo Dam and Lake, co..pleted 1n '963, and fro.. the Glla RI ver, dralnlng a~out T, 300 .:!Quare II.llea below Palnted
<br />Rock Dam and Re"'ervolr, cOlllpleted In Jan\lary 196Q.
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<br />At Imperlal Oil'" dlver~lona are made to ClIa Cravl ty Haln Canal and Ail-American Canal for I~~lgltlon
<br />proJecta In Arlxona, ln~I"dlnS the ~u... ~.lley, Gll. and Well ton_Mohawk projecn: and in Callrornl~. Inc\\ldln"
<br />the Impe~lal Valley, Coachella 'Ialley 1lrld ~e.ael'vatton Dlvl~lon or ru..a P~ojecl. Alao, under the provl~lona or
<br />tM 19~~ ~'Her Treaty, there ..ay be dIverted lo the All-A"e~lcan C'lnal at f"p"r1<11 Darn ror detlve~y ~o ~edc<l
<br />In t.he AlalllO Canal, <lr aub~ta~te "",,,.1, ~t lhe no~thf!rly boundary, II po~ll'Jn 'lr He~lco'a gU'l,-ar:teed annuat
<br />I.l10tment or waters "f the Colorado RIver. NO.&\lChd,veralonawerelllade,n 1978.
<br />
<br />Below l.aguna 01.", tIIe<aaured and un..eaaure<l rJowa are retu~ned to the ~Iver prlnclp~lly aa ".late an<l draln~
<br />aile ..ater frOll. the lrngaUun proJe~ta In lhe Unlled St.ltea. Waate and drainage watera fro.. trrl.gatlon
<br />rr'ljecta In the United Sta ~ea a I.:!o croaa e~e boundary Into H~x1co nea~ San Lula, ArIZona ..llhout return 1 ng t"
<br />therh,rlntheUnltedStatea.
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<br />Ir, t~e 11m.1tr'Jphe aectlon or t~e river. 1. 1 ..Ile~ down~trea" fro.. lhe northerly boundary. Horelo" 01.", thO!
<br />prIncipal dlve~alon 3tru~ture ror Medco, W3~ cC>lIIpleted ~nd place1 In operation on Novelllber 8, 1~50. Slnc~
<br />tha~ 1ale alQlOat all the C<lloraJ<l Rlver Clow'" that crOaa the northedy boundary (e.c..pt ....ergeney dellver1ea t"
<br />Hjuan3 bea1nnl.ng In AUg'J.at 1972' have been dlvert~d to the Alamo Canal i1t Morel05 Dam.
<br />
<br />Tijuana River Ballin
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<br />The total dr'alnage area or tne TUuana R,ver ba3l.n 1a '.73' aquare g1lle~, or wh1ch 21 percent Ilea J.n th..
<br />UnlUd ,;~~tea and 73 percen~ ,n H.."c'l. Tl1la r..~~ 15 ror1lled by t~e principal ~ributar1~a, Cottonwood Cree~.
<br />which rl~~a 1n In.. Una"d Still..a and R,o de laa Palma.a, "'hleh rl~~~ In He.l.,o. CottonwQO<l Cr....k C~0.a3~a th'l!
<br />lnternalloMl land boundary 2' mlle~ rr.,IR the Paclric Ocean t.:> J.:>ln the Rio de la~ Palmaa 1n He.ico. Frogl ~ne
<br />conCluence 'If theae tr1~utllr.l.e', the T1Juana R1ve~ rlow~ n"rth"eate~ly 5 1lI11ea to ~ro"a t~e la.nd boundary lnt'J
<br />the Un !Led .;~at..a near San Y al ~r'l, Ca 1 i forn 1 a anll 11 J llana, Baja Ca l L forn I...., 1111<1 then rl o..~ wealer ly 6 tIIlJ.ea to
<br />d'acharge lnt'J tne Pac' r l C Occall 2 ..Ilea north or ~ne boundary. Tne rl.:>u or Ccltcnwo<ld Cr"e~ 15 parlla lly
<br />contr<llled ~y ~arrett anO H.}~ena ~"~en'ol.rs In the United Stalea an<l tne r1o~ or the R,o <I.. las P.\\llIas h
<br />~arL1ally CO~tr'oll~<l ~~ RO(jp'lIuez Re"..rvo:lJ.r In Hexico.
<br />
<br />\Yhi'l:waler Draw near Douglas, AriZDna
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<br />Wnlte"ater Dra~ ~13~" in '.h.. UnHed 'i~atea 3M now~ .aou~h lnt'l He~lco, ~roaalng the ln~ern"tlCnal b.:>uMary
<br />near 0''''lll.t.1. Arl:on~, .,v~ntu~lly 11"~har~in!l 1nto th" Gulr 01' Callrornia t~rougt, th.. ~aq'Jl R,v~r In ~e"co.
<br />The ~olal -j"".lnage ..rto" ab'Jv~ ~h.. DLlugl,,, Gaglns S~,Hl"'n ,s ',023 aq~are IIllle.a. A nu..ber of "O'Jnt~ln atr"al!lll
<br />In th'l! ~Pf'cr reacne.a 01' l~~ toaalll ~r'e dio"nd ror Irrl.gHl<ln, D'H ,hey woulo ncr..all, ..Ink u,. So t<l gr<lund
<br />w~~~r b~rure reaChing l~e "'aln WJt~,. courae.
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