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<br />o~r~! <br />~~ <br /> <br />. <br /> <br />bed contains tall grass, brush, and trees. Twelve drop <br />structures were constructed in this reach to control channel <br />erosion. These structures, however, are in various stages of <br />disrepair. Construction materials for these structures included <br />rubble, timber, and concrete. A view of a typical rubble drop <br />structure is shown in figure 2. <br /> <br />, <br /> <br /> <br />Figure 2. A typical rubble drop structure. <br />July 1969. <br /> <br />e. The downstream reach of Cherry Creek is located between <br />Speer Boulevard and the South Platte River. The channel is 88 <br />feet wide and is defined by 10-foot-high concrete retaining walls. <br />A natural low-flow channel has developed to a width of about 20 <br />feet and a depth of about 5 feet. Twenty-two drop structures <br />are located at strategic locations to prevent further channel <br />degradation. These drop structures are in various stages of <br />disrepair and only remnants of some structures remain. The <br />minimum channel capacity in this reach is 8,000 cubic feet per <br />second. <br /> <br />. <br /> <br />9 <br /> <br />