The Three Lakes area encompasses the north-east corner of Grand County and is so named because of the three connected lakes of Grand Lake, Shadow Mountain Reservoir and Granby Reservoir.
The two reservoirs were formed as a part of the Colorado-Big Thompson Project, which takes water from Grand Lake on the western side of the Continental Divide to the Big Thompson River on the east. Shadow Mountain Reservoir and Granby Reservoir. connected by a unique pumping plant, assure that the Grand Lake water level remains consistent. Further reservoirs were added in the Three Lakes area, including the Willow Creek and Windy Gap Reservoirs.
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Sources:
Daniel Tyler, The Last Water Hole In the West, University of Colorado Press, 1992.