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<br />21 <br /> <br />CLARKSON ET AL. <br /> <br />:5 <br /> <br /> <br /> <br /> <br />, <br /> <br />30 <br /> <br />25 <br /> <br />Colorado River <br />above Bright Angel Creek <br />1952-'962 <br /> <br />....... <br /><.J <br />....... 20 <br />~ <br />'" <br />- '5 <br />2 <br />.. <br />t '0 <br />~ <br /> <br />o <br /> <br />Oct Nov Dee Jon Feb Uar' ~r .Uay Jun . Jul Au9 $ep <br /> <br />25 <br /> <br />..... 20 <br />(.) <br />....... <br /> <br />Uttle Colorado River <br />at Cameron <br />11190-111113 <br /> <br /> <br />~. '5 <br />.3 <br />e., <br />8. '0 <br />Ii <br />.... 5 <br /> <br /> <br />~ <br /> <br />'0 <br /> <br />, . .~ ,';" Oct. Nov Dee Jon <br />. '-.. ...--.:t...., -'_'-i~'r""".''''_L_-- _':.. ._ ,. <br /> <br />,Feb Mar. ~r May Jun Jul. Au\!, .Sep <br />--.... -.,. .<'--'. '-'--'--~ <br />. . .-..- <br /> <br />- 3:5 <br />30 <br /> <br /> <br />Poria River <br /> <br />. at Lee', .Ferry <br />'1156-'1176 <br /> <br />;---,...-:: <br /> <br />~ ....,. <br /> <br />~ <br /> <br />....... <br />.8. 25 <br />S 20 <br />i '5 <br />E to <br />~ <br /> <br /> <br />~ ~ <br />?', <br />k <br /> <br />:5 <br />o <br />1- , , Oct Nov Dee Jon Feb Mar ~r May Jun Jul. Au~ S.p- <br />FlGuRE3!..: M~ miirlmum daily (Open bars) and m~_mUimuin d~ni (hatched bars) <br />water tCmper8tures of the pre-dam Colorado RiveJ:nearPhaniomRlylch'(daily means not <br />avai1able), mean daily water temperatures (open bars) of the Little CoIorado River <br />approXimately llniie'abOve the mouth; and mean instant8neous daily water temperatures <br />(OpeD barsfof theParla River at"LeC's Ferry, Arizona, based on U.S; Geological surVey <br />gauge' Statiorf ieCords;i Vertical brackets represent :I: 1 standard deviation of the monthly <br />~ . ..~- .., . ._, !.. _ _ \ ~_ _-4.... . . <br />means. \. ,..,."--",,-,,. ':, <br /> <br />.-',' . <br />