Workers stand beside railroad tracks, tools and ladders inside the the west portal of the Alva B. Adams Tunnel of the United States Reclamation Bureau Colorado Big Thompson Project water diversion tunnel (west portal of the Continental Divide tunnel) in Grand County, Colorado. A lamp is attached to a rope over a wooden rafter in the tunnel. Concrete is applied to walls between timber supports.
[between 194 and 1947]
Accession number: 88.442.426; History Colorado.; Number: "4700" inked on negative and penciled on negative envelope.; Title penciled on negative envelope.; R7200062321