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<br />o <br />o <br />..... <br /><":l <br />~ <br />~ <br /> <br />The principal storage features are Lake Granby, Grand Lake, and Shadow Mountain Reservoir located on <br />the Colorado River near Granby, and Willow Creek Reservoir located on Willow Creek, a tributary to <br />the Colorado River below Lake Granby. Willow Creek Pumping Plant lifts the water 175 feet, which <br />then flows by gravity via the Willow Creek Feeder Canal to Lake Granby. <br /> <br />Granby Pumping Plant lifts the water from 86 feet to 185 feet from Lake Granby to Granby Pump Canal. <br />The canal conveys the water 1.8 miles to Shadow Mountain Lake, which also intercepts North Fork <br />flows of the Colorado River. Shadow Mountain Lake connects with Grand Lake to make a single body <br />of water from which diversions flow to Adams Tunnel to begin the journey to the eastern slope. <br /> <br />Emerging from Adams Tunnel into the East Portal Reservoir, the water flows across Aspen Creek Valley <br />in a siphon and then under Rams Horn Mountain through a tunnel. At this point, it enters a steel <br />penstock and falls 205 feet to Marys Lake Power plant. This power plant is located on the west shore of <br />Marys Lake, which provides afterbay and forebay capacity for re-regulating the flow. The water is <br />conveyed between Marys Lake and Estes Power plant, on the shore of Lake Estes, by Prospect Mountain <br />Conduit and Prospect Mountain Tunnel. <br /> <br />Lake Estes, located east of the Estes Power Plant, is formed by Olympus Dam on the Big Thompson <br />River. The afterbay storage in Lake Estes and the forebay storage in Marys Lake enable the Estes Power <br />plant to meet daily variations in energy demand. <br /> <br />Water from Lake Estes, as well as some of the Big Thompson River flows, is conveyed by the Olympus <br />Siphon and Tunnel, and Pole Hill Tunnel and Canal, to a penstock through which the water drops 815 <br />feet to Pole Hill Power plant. The flow is then routed through Pole Hill Power Plant Afterbay, <br />Rattlesnake Tunnel, Pinewood Lake, and Bald Mountain Pressure Tunnel, and eventually dropped 1,055 <br />feet through two penstocks to Flatiron Power plant. This power plant discharges into Flatiron Reservoir, <br />which regulates the water for release to the foothills storage and distribution system. The afterbay <br />storage in Flatiron Reservoir and the forebay storage in Pinewood Lake enable Flatiron Power plant to <br />meet daily power loads. <br /> <br />Southward, the Flatiron reversible pump/turbine lifts water from Flatiron Reservoir,a maximum of 297 <br />feet, and delivers it through Carter Lake Pressure Conduit and Tunnel to Carter Lake. When the flow is <br />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. Vrain <br />Creek, and Boulder Creek Supply Cimal. The latter delivers water to Boulder Creek and Boulder <br />Reservoir. The South Platte Supply Canal, diverting from Boulder Creek, delivers water to the South <br />Platte River. <br /> <br />Northward, the Charles Hansen Feeder Canal transports water from Flatiron Reservoir to the Big <br />Thompson River and Horsetooth Reservoir. The canal crosses the Big Thompson River in a siphon <br />above the river and highway. Water from the Big Thompson River can be diverted into the canal by <br />Dille Diversion Dam and utilized for power generation at Big Thompson Power plant. <br /> <br />Project water deliveries and Big Thompson River water to be returned to the river are dropped through a <br />chute from the feeder canal ahead of the siphon crossing, or are passed through the Big Thompson Power <br /> <br />4 <br />