In the wake of the devastating 1906 earthquake and fire, the city of San Francisco desperately needed reliable supplies of water and electricity. Its mayor, James Phelan, pressed for the damming of the Tuolumne River, setting off a firestorm of protest. This work tells the epic story of the first major environmental battle of the 20th century.

Ultimately, passage of the passage of the Raker Act in 1913 by Congress granted San Francisco the right to flood the Hetch Hetchy Valley. A decade later the O'Shaughnessy Dam, the second largest civil engineering project of its day after the Panama Canal, was completed. Yet conflict continued over the ownership of the watershed and the profits derived from hydroelectrocity. To this day the reservoir provides San Francisco with a pure and reliable source of drinking water and an important source of power. Although the Sierra Club lost this battle, the controversy stirred the public into action on behalf of national parks. Future debates over dams and restoration clearly demonstrated the burgeoning strength of grassroots environmentalism. In a narrative peopled by politicians and business leaders, engineers and laborers, preservationists and ordinary citizens, Robert W. Righter tells the epic story of the first major environmental battle of the twentieth century, which reverberates to this day.