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<br />Irrigation systems on the Colorado River, above the Blue River confluence, were improved to <br />enable continued use of existing rights., Releases are made from Lake Granby to maintain the <br />Colorado River as a live fishing stream. <br /> <br />The principal storage features are Lake Granby, Grand Lake, and Shadow Mountain Reservoir <br />located on the Colorado River near Granby, and Willow Creek Reservoir located on Willow <br />Creek, a tributary to the Colorado River below Lake Granby. Willow Creek Pumping Plant lifts <br />the water 175 feet, which then flows by gravity via the Willow Creek Feeder Canal to Lake <br />Granby. <br /> <br />Granby Pumping Plant lifts the water from 86 feet to 185 feet from Lake Granby to Granby Pump <br />Canal. The canal conveys the water 1.8 miles to Shadow Mountain Lake, which also intercepts <br />North Fork flows of the Colorado River. Shadow Mountain Lake connects with Grand Lake <br />to make a single body of water from which diversions flow to Adams Tunnel to begin the journey <br />to the eastern slope. <br /> <br />Emerging from Adams Tunnel into the East Portal Reservoir, the water flows across Aspen Creek <br />Valley in a siphon and then under Rams Horn Mountain through a tunnel. At this point, it enters <br />a steel penstock and falls 205 feet to Marys Lake Powerplant. This powerplant is located on the <br />west shore of Marys Lake, which provides afterbay and forebay capacity for re-regulating the <br />flow. Between Marys Lake and Estes Powerplant, on the shore of Lake Estes, the water is <br />conveyed by Prospect Mountain Conduit and Prospect Mountain Tunnel. <br /> <br />Lake Estes, below Estes Powerplant, is fonned by Olympus Dam constructed across the Big <br />Thompson River. The afterbay storage in Lake Estes and the fore bay storage in Marys Lake <br />enable the Estes Powerplant to meet daily variations in energy demand. <br /> <br />Water from Lake Estes and some Big Thompson River flows are conveyed by OIympus Siphon <br />and Tunnel and Pole Hill Tunnel and Canal to a penstock through which the water drops 815 feet <br />to Pole Hill Powerplant. It is then routed through Pole Hill Powerplant Afterbay, Rattlesnake <br />Tunnel, Pinewood Lake, and Bald Mountain Pressure Tunnel, and dropped 1,055 feet through <br />two penstocks to Flatiron Powerplant. This powerplant discharges into Flatiron Reservoir, which <br />regulates the water for release to the foothiIls storage and distribution system. The afterbay <br />storage in Flatiron Reservoir and the fore bay storage in Pinewood Lake enable Flatiron <br />Powerplant to meet daily power loads. <br /> <br />Southward, the Flatiron reversible pump/turbine lifts water from Flatiron Reservoir, a maximum <br />of 297 feet, and delivers it through Carter Lake Pressure Conduit and Tunnel to Carter Lake. <br />When the flow is reversed, the unit acts as a turbine-generator and produces electric energy. <br /> <br />The St. Vrain Supply Canal delivers water from Carter Lake to the Little Thompson River, St. <br />Vrain Creek, and Boulder Creek Supply Canal. The latter delivers water to Boulder Creek and <br />Boulder Reservoir. The South Platte Supply Canal, diverting from Boulder Creek, delivers water <br />to the South Platte River. <br /> <br />filename: caT AoP98.DFT <br /> <br />5 <br /> <br />Preliminary WorkiIIg Draft July &.1999 <br />