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Grand Lake  Grand Lake is the largest natural water body in Colorado. Because of the lake's scenic beauty and proximity to Rocky Mountain National Park, C-BT Project proponents agreed to minimize fluctuations in the level of Grand Lake to 1 vertical foot. In 1889 the Colorado legislature authorized $25,000 to survey a diversion project from Grand Lake to the St. Vrain River. In 1904 and 1905, the newly formed Reclamation Service - now the U.S. Bureau of Reclamation - examined the possibility of enlarging Grand Lake. When this proved unfeasible, USBR engineer Gerald H. Mathes suggested a 12-mile tunnel from Grand Lake to either the Big Thompson or St. Vrain River. Mathes' plan was the first description of what later became the Colorado-Big Thompson Project. Grand Lake is the last stop for C-BT water collected on the West Slope. From Grand Lake water enters the West Portal of the Adams Tunnel. As it flows 13.1 miles through the tunnel the water drops 108 feet to the East Portal, on the other side of the Continental Divide. Grand Lake by the Numbers Map of Grand Lake |
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