For much of the 20th century, hydroelectric technology led to the construction of giant dams across the American West and around the world. Big hydro projects have a big impact on surrounding ecosystems, Colorado is at the center of a growing move toward hydropower on a smaller scale.
In northern Nevada, a place famous for its wide, open spaces and expansive cattle operations, ranchers are in a bind due to the historic drought.
Much of the state is desert, so when people talk about drought, they're really talking about the snowpack in the Sierra Nevada. It's at barely 20 percent of average.
This is a huge concern for farmers and ranchers like Julie Wolf, because the mountains store the snow that melts and feeds rivers and reservoirs. These bodies of water then allow the desert to bloom with grass and alfalfa for her cattle.
When Pete Olsen talks about drought on his fifth-generation dairy farm in Fallon, Nev., he's really talking about the snowpack 60 miles to the west in the Sierra Nevada.
The Sierras, Olsen says, are their lifeblood.
That is, the snowmelt from them feeds the Truckee and Carson rivers and a tangle of reservoirs and canals that make this desert bloom. Some of the highest-grade alfalfa in the world is grown here. And it makes perfect feed for dairy cows, because it's rich in nutrients.