The Emerald Mile: The Epic Story of the Fastest Ride in History Through the Heart of the Grand Canyon

by Kevin Fedarko

By 1980, when the National Park Service finally completed an inventory of all the rivers in the contiguous United States, more than seventy-five thousand dams had been erected on the country’s three-thousand-plus waterways—

By 1980, when the National Park Service finally completed an inventory of all the rivers in the contiguous United States, more than seventy-five thousand dams had been erected on the country’s three-thousand-plus waterways—