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<br />. <br /> <br />7 <br /> <br /> <br />f'! ,f'\; r, n / , <br />",I I, ,. /" '<,.- c. it <br />'"' '- ~. -,.. ..i . <br /> <br />. <br /> <br />downstream, the valleys broaden and flatten to average from one- <br />half mile to more than 1 mile wide. Stream slopes are rather <br />steep throughout the basin. Stream gradients on Sand Creek range <br />from 25 feet per mile upstream from Buckley Field to about 27 <br />feet per mile downstream from Buckley Field. East Toll Gate and <br />West Toll Gate Creeks slope about 50 feet per mile from their <br />headwaters to their junction. Downstream from the junction, Toll <br />Gate Creek has a slope of about 20 feet per mile. Through the <br />metropolitan area, Sand Creek is generally characterized by a <br />broad flat-bottomed sandy channel with low steep banks. Grass, <br />brush, and trees occupy portions of the immediate overflow area. <br />The Sand Creek channel width from Buckley Field to its mouth <br />ranges from 30 to 250 feet. The Toll Gate Creek channel ranges <br />from about 15 feet wide at its source to 150 feet wide at its <br />mouth. <br /> <br />b. Cherry Creek basin. Cherry Creek is formed by the con- <br />fluence of East Cherry and West Cherry Creeks. Valley widths <br />along the two creeks average about one-fourth mile. Stream <br />gradients on these tributaries range from 35 to 60 feet per mile. <br />From the confluence of East Cherry and West Cherry Creeks to <br />Lake Gulch, Cherry Creek has an average stream gradient of <br />100 feet per mile. From Lake Gulch to a point 2 miles south <br />of Franktown, Cherry Creek passes through a narrow steep-walled <br />canyon, dropping 400 feet in about 5 miles. In the vicinity of <br />Franktown, Cherry Creek enters a broad flat-bottome( valley about <br />three-fourths of a mile wide. From Franktown to the Cherry Creek <br />Reservoir, the Cherry Creek channel averages 200 feet wide and <br />ranges from 2 to 10 feet deep. The bed has an average slope of <br />25 feet per mile. The channel is alluvial, flat-bottomed, and <br />follows a meandering course. <br />