With Lake Powell water levels falling, expensive modifications are being considered to keep the 60-year-old Arizona dam generating power.

Colorado River Rafting is ranked #12 out of 20 things to do in Grand Canyon National Park. See pictures and our review of Colorado River Rafting.

9:50am Reel America: Glen Canyon Dam Construction - 1961 This 1961 Information Agency film covered the first years of construction of the Glen Canyon dam on the Colorado River in northern Arizona.

San Manuel Mine was once the world’s largest underground copper mining operation in size of ore body, production capacity and infrastructure.

Explore news and insights on climate change, environment policies, global warming and sustainable practices with The New York Times Climate and Environment section.