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Colorado–Big Thompson Project

  • Lake Granby

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    View of Lake Granby, a reservoir created by the Colorado-Big Thompson Project, looking east. The project diverted water from the Colorado River across the Continental Divide to cities and farms on the Front Range.
    Lake Granby
  • Horsetooth Reservoir

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    Aerial view of Horsetooth Reservoir looking south. The reservoir was created as part of the Colorado-Big Thompson Project and supplies water to the city of Fort Collins.
    Horsetooth Reservoir
  • St. Vrain Supply Canal
  • C-BT Project Map

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    Map of the Colorado-Big Thompson Project, one of the largest water diversion projects in the history of the United States.
    C-BT Project Map
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