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<br />WESTERN BOUND,>,RY W'ITEP. BULLETIN 1965 INTERNATIONAL BOUNDARY AND WATER COMMISSION
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<br />FOREWORD
<br />
<br />ThlB bulleUn IS the sixth annu<ll compllatH.>n of stream dLl!lcharges and othl'r hydrograpluc ddta relatmg to the Imer-
<br />national aspects of the Colorado R1I'er below Imperial D.1m. tho: Tlju3na River and oJthcr StI't'Sms cross Lng me western lBnd
<br />bouno.b.ry. The comrlbtlon w..s prep..red jointly by the Umted States and MexIC;J.n SectIons of the InterrutlOll.llI Boundary
<br />and Water Comml5sloo. solely for the pu:rpUSl' of pre~ntlng statlstiCOll dat.a rt:1atlDg to strt:am flow and kLndred subjects
<br />for the Colorddo Hiver (rom I mperLa I Dam to the Gull CJf Caluortlla, the TijU3m River and Its Importanl tnbutarles In the
<br />Unito:dSrates and Mexico, and other streams. lIlcludlllg the Alamo dnd New RlyerS which cross theCallfornoa-lJ3la Callfonua
<br />boundary. and the Santa Cruz R\ver and Whltewater Draw whIch cross the Arizona.-Sonora bOI.mdary. TIlls volume cont.alfis
<br />the lJlformatLoo fortheyeJ.r 1965.
<br />
<br />Suealll gaging OIl the Colorado Rl.er below Impenal Dam bt:gdn in 1902 when the slat Ion at Ywna, Arizona "'015 es-
<br />lablLshed. SWge records hllve been Obtalnf:t1 at thIS sration 5lnCe January 1878. ContLnuou~ strf:am g;1ging on the Tijuana
<br />Rlyer and liS Imponant trIbutaries In the UnLted SlateB and in MeXIco began In 1';l3b. Each g<;'YO:Inl11em opeIdtes the g:!gtng
<br />staLiooslocaled .....ithin ItS OWn country.
<br />
<br />Colorado River below Imperial Dam
<br />
<br />Below Imperial Dam, the ColoradO RI.er nows ~t;~thward 10 mLl~s to thf: mouth of the GLla Rn'~r. th.en~e westward
<br />II miles ro Pllot Knob MOunlall1, and south I mLle to the pOll1t where the non.herly luternaflonol land bOWldaI")', bet.....e"n
<br />Caldoruta and Baja CalifornIa, lnler-"Ccts tho rh"r. Prom thIS ploint the river conunLlC" to !lo..... southward and forms the
<br />boundaI")' !Jet"'een the United Stales and Mexlcofora distance of ahoJut Z2 miles loJ lhe pOll1! where the southerly Int"rna-
<br />tlonaJ land bound~n.' bet.....een ArtZOl1Ol and Sonora intersects the rt.er. From thlll pOlnl the n.er coJntinues to no..... south.
<br />ward d.boul 90 mlleSlO dl5~harge InlO th" Gulf of Callfo;,rnla.
<br />
<br />The ordlnarv now" oJf ColoradO Rlyer below lm~I1.al Dam are largely controlled by n:Jea5"5 al Hooyer Dam, COI11-
<br />pleled In I~J5. .he releases arc further r~gul8ted at DaVIS 0.'1111, compl~ted In 1950, and by Parker and Imperi~l Oal11s,
<br />~ompleted In l';ln. Small amoWlts of runu[f may oeca"lonally be contributed 10 the lJow in the ICM'er rwer trom the u~uaJly
<br />dry arro\"os drdlnlng the 10,900 square miles along th" river trom Hoover Dam tl) the m':oJlh 01 lh" Gola River. not in-
<br />c1udll1g 5.500 square nules Il1 the BIll WllI\al11.'1 Rtver walershed. In addllLOn, now.'! ranGll1g from usualJy mll10r amounts
<br />to lnfrequem lorrenual n",xl~ mal' f:nrer the lower Colorado Rwer froJm the Bill WillIams River and from th~ Gila RIver,
<br />draLJ1lng' abuul 7..300 square mill's.tx.luw Pdlnl"d Ro..:k D..l1llU1d Re5el""Olr, ,:ompleted LJ1 JanuaI)' 1960.
<br />
<br />Al Imperial Dam, dl.eTl,IOn" are mode to Gila Gra'lly MaLJ1 Canal and Ail-AmerIcan Canal lor Irrlgatton proJecl5 In
<br />AnzoJIOa. lJ1~ludln;t the YUlllll Vall<-",'. Gil8 8nd Welllon-Mohawk proJ~ct.'l, nnd in C..luom.o, lnc\udU1g tha Imperl.J Valley,
<br />Coachella Valley and Reservarion Dlvlsion of Yuma PrlJject. Also, under the p~ovl.'!l(\nS of the 19H W,lter Tre..ry, th"r<':
<br />l11ay bl' dlvertl'd to the AII-Amencan Cdnal it Imperlil Dam tor deliyery to M..xlco In the AlamoC~nal, or substuute
<br />canol, al the nonherly boundary, .a portIon o( MeXICO'S guirantef:d annua.l alJotrm'nt of walers of !.he Colur~do RIV"r. No
<br />such dh'ersloJns.....ere l11ade in 1'165.
<br />
<br />Below LaguTla D.1m. mea ..'lured and unmeasured nows are returned to the nver prmclpally 08 wasil' aod drainage
<br />water from the ll'Tigatlon proJectB In the Umted States. Waste and dralIlago: waters from lITIgation proj~cts in the United
<br />States also ~rOB.'l the bound<J.ry IntO MeXicO n~ar S~n LUIS. ArIZona Without returnlllg to ltle rIver m the United St:Oltl'5.
<br />
<br />In th.. ilmitrophe BectWn of tho r.-er, l. I mIles downstream from tilt: northerly boJundary. MoreloB Dam. the prlllCl-
<br />pal dlversioo structure for MeXICO. wa, compleled and plJ.ced in operdtlCJn on November Il. 1950. Smce th.ilt dale all of
<br />MexlCo's guarolI1t~d trl"'ry allowent of ColoriLdo RI'l'r water h.ila been dtJi,'ered In the lim1tr~he section of lhe r.-er.
<br />Th.. ..n'~re.r pOrtlCltl (If such dell''eTles hiS OC>l'n dl'l"n"'d to th.e Alamo Canal at MQreloB Dam.
<br />
<br />Tijuana River Buin
<br />
<br />The [<Jtal draina..-e dre.. of the Tlju..na RIver basin Is I, 7JI square miJet; of wh\~h 27 pl!r~ent 11"'.'1 In the UnLled Stall'S
<br />and 73 percent In Mell.lcoJ. This Ilyer I" formed by the prInCIpal tIlbularies, Cononwood Creek, .....hlCh rl~e~ rn the Umted
<br />Slale~ und R{o de IdS Palma:> which Ilrl,," Ul MeXICO. Cononwooo Cr"ek crosses th" Int"Inationlll land boundan 21mt1es
<br />from the Pa"ulc Oce.an 10 jO~ the R(o de las Palmas III MeAlco. From the conDuen~" 01 th":>,, lributarles, the Tljuan~ Rh.-
<br />er !low~ northwe~l<'rly 5 m!1"s to crU5S th~ land boUIldary Into the Unlled Stares near San Y~ldrCJ, Calilornla. Itnd TIJuana.
<br />Raja C.!llrorm:l., and th"n !lows .....eslerl}' b miles to disLhargo: WlO the Paci!lc Oce1lll 2 mll~s nOrm 01 the boundary. The
<br />f1~..... of Ce>non.....I)od Cr"ek I" p.lTt1<.1\~' conuolJed b)' Barren and Morena Reservoirs in the U'uted Slales and the flow of the
<br />RIO de las Palma" 15 p~ruall}' "ontroUed by RodIlguez Resen.olr UI Me:oco.
<br />
<br />Whitewater Draw near Dougla., Arizona
<br />
<br />WhLle...ater Draw ns"s 111 thl' United St..tes IlJ1d tlows aOUlh inlO MeXICO cros:>rn;: the Ullernallonal boundary near
<br />Oouglis, Arizu!1.l, cv~nlualll' dlscharglIlg inlO rhe GUIIOT Call1ornla through th" YaquI Rwer U1 Mexico. The total drain-
<br />age area aho,.c thc Douglas C..ging Slalll'n 15 I,UB square nllles. A numrer 01 mountain "tream." lIt the upper reaches 01
<br />the basin <Ire dl."",,d for lrTlgall'ln but th"y woulcl normally sink or go to groUIldwaler bt:fore reachJl1jo; the maUl waler
<br />course.
<br />
<br />San Pedro River at Palominu, Arizona
<br />
<br />II
<br />
<br />Tbe San Pedro RIver rises In MeXICO and no....." north WlO the Uruted Sta~S crosslJ1g the boWld.ary Dear PalomlJ1as,
<br />ArIZona, and thence north.....eslerly IIltO the Gila RI\'er. The rIver III the viclnlry 01 the Ulternauooal boWldary dratJlS all
<br />arl'a of 741 square miles of which (.049 square ml\e~ llrC In Mexlco.
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