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,- . . SOME FLOODS IN THE ROCKY MOUNTAIN REGION. 123 . , about 6,000 second-feet, The difference between 17,000 second-feet near Parker and 6,000 second-feet at Denver shows the effect of the f1l1.ttening out of the flood crest as it progressed downstream, owing to the channel and overflow storage a./l'orded it, If the storm of 1922 had occurred nearer Denver, the resulting flood in Denver would probably have almost equa.led that of 1912. BUCXKORN CREEK NEAR LOVELAND, COLO. From June 14 to 16, 1923, heavy rains occurred over an area that extended from a point a few miles east of Greeley, Colo"to the western edge of R. 70 W., in the foothill region.- The only Weather Bureau records within this area are those at Fort Collins, which show a precipitation of 2.07 inches; those at Waterdale, which show 2,39 inches; and those at Greeley, which show 2.63 inches during the entire period. The heaviest precipita- tion was south of Fort Collins, near Loveland, in the foothill area, and appeared to center over the lower part of the Buckhorn Creek bll8in. This caused the highest flood known on Buckhorn Creek and several of its tributaries. All bridges on the lower Buckhorn and on Big Thompson Creek below the Buckhorn were washed out, two lives were lost, thousands of acres of rich agricultural land was ruined, and much livestock was drowned. The drainage area of the lower Buckhorn Creek consists of three narrow, troughlike valleys, which converge slightly toward the north- west, Narrow ridges 400 to 500 feet high separate .these valleys. The middle valley is drained by Buckhorn Creek, which flows south- eastward. The other two valleys are drained by a number of small tnl>utaries that have cut through the narrow ridges, forming side canyons, and join the main stream at short interVals. These small tributaries drain fan-shaped areas which converge at the outlet canyons. The slopes are steep and rocky and support little vegeta.- tion except some scrubby pines and a small amount of brush. The United States Geological Survey made an investigation of the flood within a week of its occurrence, determined the )'Tl."'mum dis- charge at three points by means of slope l1leasurements from well- defined high-water marks, measured the cross sections of flood areas, . and interviewed residents to obtain all possible information on the rainfall. The storm came from the south and followed the courSe of Buckhorn and Redstone creeks. In its progress northWard the storm was augmented by clouds from the southeast. Observers at Loveland stated that swiftly moving clouds passed over Loveland arid con- tinued northwestward to the foothills, where they appeared to join the main storm, which was traveling northward. The troughlike valleys up which the clouds traveled converge at their north ends,