abstract
america
arch
arizona
background
beautiful
blue
boulder
built
canyon
colorado
colorado river
concrete
dam
design
electricity
engineering
environment
famous
fuel and power generation
hoover
hoover dam
hydroelectric
infrastructure
lake
lake mead
landmark
landscape
mountain
mountains
natural
nature
nevada
outdoors
pattern
power
public utility
reflections in water
reservoir
river
scenic
structure
summer
tourism
travel
united states
usa
view
water
water pattern