to the intake of the Alva B. Adams Tunnel on Grand Lake's eastern shore. The water then flows under the Continental Divide through the Adams Tunnel, which can carry up to to the eastern slope. East-slope hydroelectric system Once the water emerges from the Adams Tunnel just southwest of Estes Park, the system is almost entirely gravity powered, dropping some as it descends to the foothills of the Rocky Mountains west of Loveland. The tunnel outlet is located at East Portal Reservoir, a small regulating pool on the Wind River. From here it is transported via an inverted siphon across the Aspen Creek valley and drops to Mary’s Lake, where it drives the 8.1 megawatt (MW) Mary’s Lake Powerplant. Mary’s Lake is a small natural lake enlarged to form a second regulatory reservoir. The water then drops to the 45-MW Estes Powerplant at Lake Estes, which is formed by Olympus Dam on the Big Thompson River at Estes Park. Lake Estes serves to regulate both C-BT water and the natural flows of the Big Thompson River. From Lake Estes the water travels east via the Olympus and Pole Hill Tunnels to the 38.2 MW Pole Hill Powerplant, where it drops , and flows via the shorter Rattlesnake Tunnel to Pinewood Lake. The water then enters the Bald Mountain Tunnel, heading east to a final drop of at 94.5 MW Flatiron Powerplant. From the tailrace of the powerplant the water enters Flatiron Reservoir from which the water is distributed to the eastern slope. Foothill distribution facilities Once the water reaches Flatiron Reservoir, it splits into two branches which distribute water to about of the Front Range Corridor, from Fort Collins to near Denver. The northern branch consists of the Horsetooth Feeder Canal and tunnels which feeds water by gravity to Horsetooth Reservoir. The reservoir is formed by four dams in the hills west of Fort Collins and has a total capacity of . The northern end of the reservoir outlets into the Charles Hansen Supply Canal, which mainly supplies agriculture in the Cache la Poudre River valley. There is a smaller outlet at Soldier Canyon which provides water to the Fort Collins area. Water flowing into the southern branch must be pumped into Carter Lake Reservoir, located west of Berthoud. The reservoir can hold up to of water. During times of peak power demand, water can be released back from Carter