Constructing of diversion tunnels, upstream end. Setting up frames for trash racks. Note on back: "Upstream end of the diversion tunnel on Nevada side, probably No. 1 tunnel. - W. A. Davis, 1992."
Diversion Tunnel No. 3 nearly completed. Sept. 1, 1932. "Asphalt visible on ceiling. Fill on Floor & rails have to be removed prior to use for water diversion. Tunnel is completed except for fill removal." W.A. Davis, 1992