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    • West portal Continental Divide Tunnel

    • View of the entrance to the west portal of the Alva B. Adams Tunnel of the United States Reclamation Bureau Colorado Big Thompson Project water diversion tunnel in Grand County County, Colorado. A sign reads: "West Portal Continental Divide Tunnel,...
    • Colorado-Big Thompson Project (U.S.)--1940-1950.; Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Tunnels--Colorado--Grand County--1940-1950.
    • [between 1940 and 1947]

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