The Gorge Tunnel images date from 1949. The images are 3 1/2x 5” inches and are pasted on 8 ½ x 11 sheets of paper with typed descriptions. Images include the mucking trestle, the cribs, workers, the elevator pit, the sluiceway, and all stages of the tunnel construction. Workers and equipment are also pictured in this series of GT negatives. The negative numbers range from SP-4-GT to SP-249-GT.

The Gorge Surge Tank images date from 1949 to 1950. Negative numbers range from SP-1-GST to SP-90-GST. Over 75 prints are included and are accompanied typewritten descriptions of all aspects of construction. The images of the Ladder Creek Settling Tank date from 1950; no negative numbers are available for these 15 images.

The 25 Newhalem Creek Intake images date primarily from 1949 to 1950. Included are images of the diamond drill, the penstock, the Newhalem Creek Tunnel, and people working in the tunnel. The negative numbers range from SP-1-NC to SP-19-NC.