lower granite dam
The main construction contract for the dam was awarded May 13, 1970. After rock excavation, it was time to pour concrete, a process which took about two years, finishing in Spring of 1973. Between 1973 and 1974, the spillway gates were installed, along with the navigation lock equipment. The structure of the powerhouse was completed, and the first three units were installed.

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Photo by: Hannah Mitchell |  VIRIN: 230825-A-QM295-0003.JPG