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<br />8. Runoff. - The heaviest streamflows from the 5-6 September storm <br />occurred in the San Juan-Colorado SUbbasin and the upper areas of <br />the Dolores and Uncompahgre River Watersheds in the Colorado River <br />Watershed above Lee Ferry. Flood peaks were significant on the <br />Animas and Rio Blanco Rivers, on Vallecito, McElmo and Montezuma <br />Creeks and on the San Juan River in the reach from Aneth to Lake <br />Powell in utah. High flows also occurred on Dr;y and Tabeguache <br />Creeks, tributaries to the San Miguel River, c8Usin<< flooding to <br />occur in the town of Uravan, Colorado. Many of the small creeks <br />and streams within the area that are normally dry, crested as <br />"walls of DUddy water" 6 to 10 feet high. Indirect determinatioM <br />made of the 6 September high flows in Montezuma and McElmo Creeks <br />near their mouths showed that the peak flows were 40,500 cfs and <br />13,000 cfs, respectively. The peak flow in San Juan River at <br />Shiprock, New Mexico (40 miles upstream from McElmo Creek) with <br />partial regulation from Navajo, Vallecito and Lemon Reservoirs, <br />was about 14,000 cfs on 7 September. <br /> <br /> <br />9. The peak flow in San Juan River at the gaging station "near <br />Blu1'1''' Utah, was 52,940 cfs on 6 September. This peak resulted <br />primarily from Montezuma and McElmo Creeks. Significant peaks <br />occurred in a number of other streams in the San Juan River basin <br />above Navajo, Valleci to and Lemon Reservoirs. Table 2 contains <br />the runoff data which is a tabulation of the U. S. Geolological <br />Surveys preliminary peak flows for the September 1970 flood period <br />in comparison with previously recorded ma.ximum flows. The San <br />Juan River System is presented in schematic form on Plate II showing <br />peak flows at key river stations during the flood period. <br /> <br />8 <br />