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Originally named Boulder Dam, it was renamed Hoover Dam in 1946. In this picture we see a diversion tunnel, showing the entrance of one of the 16 tunnels which lead to the turbines where the water turns the turbines to create electricity.
1 photograph :b&w Photographic prints
00009877 Security Pacific National Bank Collection Industries-Water and Power-Reservoirs-Hoover Dam.; A-002-540.1 4x5 CARL0000011686 http://220.127.116.11/cdm/ref/collection/photos/id/84459
Dams--Arizona Dams--Nevada Hoover Dam (Ariz. and Nev.)