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<br />0515 <br /> <br />construction by the Corps of Engineers in the Upper South Platte <br />Rl. ver basin. They are: the Cherry Creek Dam and Reservoir <br />project constructed in the 1950's; Chatfield Dam and Reservoir on <br />the South Platte "River just upstream of Denver which is nearing <br />completion; and Bear Creek Dam and Reservoir which is currently <br />under construction on Bear Creek just west of Denver. These dams <br />do not have any significant effect on the flood flows in the <br />study area. <br /> <br />:roTENTIAL PROJECTS <br /> <br />There are no known potential projects in the basin that, if <br />:Implemented, would affect the current condition in the study area. <br /> <br />Sl'REAM CIlABACTERISTICS <br /> <br />The Lower South Platte River flows through the semiarid <br />rolling plains region of northeastern Colorado and southwestern <br />Nebraska. The l.arger floods, covering long reaches of the river, <br />have been caused by heavy rains from frontal storm activity over <br />major portions of the basin. Heavy snowfall in the Rocky Mountains <br />Jm:',f cause snoWllLelt flooding. Snowmel.t floods have been more <br />"IlCderate than storm rainfall floods, but are usua1.ly of longest <br />duration. SnoWllLelt floods genera1.ly occur from April to June on <br />the South Platte River. Storms over tributaries in the lower <br />portion of the basin are the major source of flooding in the study <br />area. Storms over tributaries in the upper portion of the basin, <br />however, do not produce enough volume to reach the study area. <br />J)RmRging floods on the Low-er South Pl.atte River have been recorded <br />during the period April. to September. <br /> <br />3 <br />