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<br />. <br /> <br />CHECKLIST OF FACTUAL DATA <br />RELATING TO OPERATING CRITERIA <br />AGREED TO BY TASK FORCE t.tEMBERS <br /> <br />Water Supply <br /> <br />Virgin Flow at Lee Ferry <br />The Colorado River drains parts of seven states (Arizona, California, <br /> <br />Colorado, Nevada, New Mexico, Utah, and Wyoming) and also of Nexico. <br /> <br />The runoff is erratic and varies considerably throughout the year as <br /> <br />well as from year to year. The flow of the river has been measured <br /> <br />near its mouth at Yuma, Arizona, continuously since 1903. Some of <br /> <br />the principal tributaries have been measured "since 1895. Neasure- <br /> <br />ments of the flow of the Colorado River at Lees Ferry were started in <br /> <br /> <br />. J\IDe 1921. The Paria River at Lees Ferry has been measured since <br /> <br /> <br />October 1923. The flow at the Lee Ferry compact point is est !mated <br /> <br />to be the sum of the Colorado River at Lees Ferry and the Peria <br /> <br />River at Lees Ferry. Prior to the period of actual record at Lees <br /> <br />Ferry, the flow of the Colorado River was estimated by comparison <br /> <br />with records available on the principal tributaries. To the estimated <br /> <br />and recorded historic flows, there were added the estimates of past <br /> <br />annual depletions in the Upper Colorado River Basin to obtain an <br />estimate of annual virgin (or undepleted flow). Starting in 1962, <br /> <br />the estimate of Upper Basin depletions reflects also the water <br /> <br />impounded each year in the reservoirs of the Colorado River Storage <br /> <br />Project. <br /> <br />. <br /> <br />\ <br />