Big Creek projects & Colorado River Survey [Colorado River Survey (1922 - with captions)- Hall's Crossing, Rock Island, Hole in the Wall, San Juan River, San Juan dam site, Aztec Creek, Rainbow Natural Bridge, Girand dam site, Sentinel Rock dam site, Boulder Canyon dam site, Black Canyon dam site, Pierce's Ferry, Grand Wash Canyon, Hualpai dam site, Virgin Canyon dam site, Callville dam site, El Dorado dam site; Huntington Lake -Dam 1 spilling, assembly of 4th unit Powerhouse 1; Florence Lake - Dam construction, tunnel construction, diversion dam at Camp 63.]
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