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I I I I I I I I I I I I I I I I I I I -3- Numerous reservoirs have been constructed in the South Pl atte River Basin for various reasons. While all exert some localized impact on the river, in most cases their impact, with the exception of major flood control facil i- ties, is minimal on the response of the entire system. Five major water supply reservoirs are located within the study reach of the South Pl atte River: 1) Cheeseman; 2) Antero; 3) Eleven-Mile Canyon; 4) Strontia Springs; and 5) Spinney Mountain, Three major flood control reservoirs which provide significant control of the South Platte River exist within the study basin. These facilities are: 1) Chatfield; 2) Cherry Creek; and 3) Bear Creek. Cherry Creek Dam is located on Cherry Creek 12 miles upstream from the con- fluence with the South Platte River, Chatfield Reservoir is located on the South Platte River just downstream of its confluence with Plum Creek and up- stream of the study area, and Bear Creek Dam is located on Bear Creek 8 miles upstream of its confluence with the South Platte River. Major South Platte River tributaries and reservoirs are shown on Figures 1 and 2. j/ .s'O~~.. DENVER ""';.f\ Bear Creek Reservoir '. ,,-..8eor Q.. j'---"'--'" Cherry ~- : Creek ----... . . SIronlia Reservoir , Spring s '\'" Reservoir ,,')'!:!~:.rh ~,~~~!l!..B.<!!.le /..~ f "AIRPLAY ~ "" ~ "'80 " , 0:.'1/,,; "'-<- ... 0,,, 0,+ ./' STUDY REACH DESCRIPTION In the reach of the South Platte River lying in Adams County, development in the floodplains is primarily agricultural with occasional sand and gravel mining operations, In the reach from Sand Creek to Franklin Street, flood- plain development consists of meat processing plants, truck farms, and the Metropolitan Denver Sewage Disposal District treatment plant. The reach from Franklin Street to the confluence of Cherry Creek is characterized by railroad yards and industrial facilities. The reach from Cherry Creek to Colfax Avenue includes a large portion of the Central Platte Valley and is a largely undeveloped floodplain and railroad yards, From Colfax to Evans, the South Platte floodplain is heavily urbanized and the South Platte River itself is channelized. The reach from Evans Avenue to Oxford Avenue is sub- urban with large industrial facilities including the littleton/Englewood Sewage Treatment Pl ant and a Publ ic Service Company power generating pl ant. At the upper end of the study reach, the South Platte River divides a wild- life park and a golf course. 10 0 k...,. - - -J 10 20 . Scale in Miles 30 , 40 50 I Obstructions to flood flows within the study reach consist mainly of manmade structures including bridges, drop structures, and diversion dams. During FIGURE SOUTH PLATTE RIVER BASIN MAP WRIGHT WATER ENGINEERS. INC. 2490 W.26TH AVE.-SUITE 55A DENVER, COLORADO 802/1