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<br />DI4 <br /> <br />FLOODS OF 1965 IN THE UNITED STATES <br /> <br />peak discharge of 52,200 cfs from Chico Creek. Peak discharges attenuated <br />greatiy on Chico Creek below Black Squirrel Creek, the major tributary <br />which enters about 12 miles upstream from the mouth, and also on Biack <br />Squirrel Creek. Biack Squirrei Creek had a peak discharge of 141,000 cfs <br />about 20 miles upstream from its mouth from a drainage area of only 353 <br />square miles. <br /> <br />!:~ <br /> <br />" <br />~ <br />'- <br />~ <br />~ <br />~ <br />~ <br /> <br />Site No. <br />(pl.!) <br />1 Near Pueblo, Colo. <br />9------- Near Avondale, Colo. <br />17--......-------- At Catlin Dam, Colo. <br />20--- At La Junta, Colo. <br />23---.----- At Las Animas, Colo. <br /> <br />~ 20,000 <br />" <br />.. <br />'" <br />" <br />~ <br />25 <br /> <br />10,000 <br /> <br />I~ <br />\ <br /> <br />" <br />1\," <br />I \: \ <br />-' ...:.....:,.. <br /> <br />, <br />I <br />,I <br />" <br />" <br />III <br />Ipl <br />11'1 , <br />'1' 'r <br />'\ i l, \;\ <br />.1 \ I I: \/ \ <br />.' '," V <br />;11\ \1\\1/\ i' \ <br />, f : ~J,l: ~ \( \ ". <br />,/... '\ n~,p;.'~ <br />'..... ';__ J '.....__.............. <br /> <br />; <br />.' <br />:'\ <br /> <br />40,000 <br /> <br />~ 30,000 <br />" <br />" <br />~ <br /> <br />o <br /> <br />14 <br /> <br />15 <br /> <br />16 <br /> <br /> <br />17 <br />JUNE 1965 <br /> <br />18 <br /> <br />19 <br /> <br />20 <br /> <br />FIGURE 6. - Discharge hydrographs from selected gaging stations on Arkansas River, Pueblo <br />to Las Animas, Colo. <br /> <br />As flooding proceeded down the Arkansas River from Avondale, other <br />large tributary inflows increased the main-stem discharges significantly, <br />Coincidental timing of the flood crests would have increased the main-stem <br />discharges even more. The tributaries between Avondale and Nepesta <br />added only nominal flows, probably less than 3,000 cfs from the Huerfano <br />River, the major tributary, The peak discharge of the Arkansas River <br />attenuated from the 104,000 cfs below Chico Creek to 43,100 cfs at the sta- <br />tion near N epesta, Attenuation was offset by tributary inflow below <br />Nepesta, and the peak discharge at Catlin Dam was 43,200 cfs on June 18. <br />The tributaries probably peaked on the previous day, as shown by the <br />Apishapa River, which peaked at 11,400 cfs on June 17, The Apishapa <br />River was contributing less than 200 cfs at the time of the peak flow on the <br />Arkansas River (June 18). The peak flow from the Apishapa River con- <br />tributed to a secondary peak of 23,400 cfs at Catlin Dam on June 17, <br />Between Catlin Dam and La Junta, Timpas Creek and Crooked Arroyo <br />enter the river, These two tributaries peaked on the morning of June 17, <br />