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<br />Spinney Mountain Reservoir, completed in 1981, with a capacity of 53,651 acre-feet <br />serves as Aurora's primary East Slope storage facility. It stores Aurora's South Park water <br />and Arkansas and Colorado River water imported into the basin through the Otero pump <br />station. As stated in an August 12, 1980 Cooperative Agreement between Aurora and <br />CDOW, "the City shall operate the Reservoir so as to provide a minimum streamflow <br />downstream of the Dam equal to the native streamflow of the South Platte River, or <br />32 cfs, whichever is less, as measured by the Denver Water Board stream gaging station <br />known as The South Platte River Gaging Station above Eleven Mile Canyon Reservoir <br />near Hartsel. Native streamflows shall be defined as South Platte streamflow entering the <br />Reservoir, less that portion of the streamflow attributable to Aurora's South Park water <br />rights, which historically were not part of the streamflow..." Table 5 sUml11arizes the <br />historic outflow from Spinney Mountain Reservoir~ <br /> <br />Eleven Mile Canyon Reservoir was completed in 1932 with a capacity of 97,779 acre- <br />feet. The dam is a gravity arch with a height of 135 feet, making it the second largest <br />storage facility in Denver Water's system atld one of the largest bodies of water on <br />Colorado's East Slope. It has a length of over six miles. It is a popular recreation spot <br />managed by the Colorado Division of Parks. The reservoir is operated as a drought <br />reservoir, meaning the reservoir is usually kept full and spilling inflow+ However, it is <br />subject to drawdown to meet Denver water needs during periods of drought There are no <br />formal minimum streamflow requirements below Eleven Mile reservoir. <br /> <br />Eleven Mile has three valve runs. Run No.1 has a 42" cone valve for a guard valve and a <br />42" cone valve for regulating. Run No.2 has a 42" cone guard valve and a 36ft ring-jet <br />regulating valve. Run No.3 has a 30" cone guard valve and a 30" cone regulating valve. <br />The valves have some operating restrictions, and Denver Water is currently considering <br />replacing outlet valves. <br /> <br />With a surcharged reservoir, the spillway capacity is 2,140 cfs, the normal valve capacity <br />is 425 cfs, and the emergency valve capacity is about 1,400 efs. <br /> <br />N ~\Supply\ Waage\wildscen\attachb.doc <br /> <br />B...33 <br />