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Alva B. Adams Tunnel

  • Construction of Adams Tunnel

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    Workers used railed carts like the one shown here to excavate the 13.1-mile Alva B. Adams Tunnel. Construction of the tunnel, which would become the largest water diversion project in the state, lasted between 1940 and 1944.
    Construction of Adams Tunnel
  • Map of Colorado-Big Thompson Project, East Wing

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    The Alva B. Adams Tunnel was the linchpin of the controversial Colorado-Big Thompson Project, a massive feat of engineering that redirected millions of gallons of Colorado River water from the Western Slope to farms and subdivisions along the Front Range.
    Map of Colorado-Big Thompson Project, East Wing
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