active
arch
arizona
blue
bridge
built structure
canyon
cement
color
colorado
concept
concrete
construction
dam
electricity
energy
engineering
generator
hoover
hoover dam
hydro
hydroelectric
image
industry
majestic
mountain
nature
nevada
outdoors
people
photo tourism
power
reservoir
river
sky
station
sunset
technology
usa
water
定額
USA. The lower course of the Colorado River. The construction of the longest concrete arch bridge in 2009. Grandiose engineering decision. The concept of active and photo tourismの素材 [FY310147566323]
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