A 100+ years ago, no one might have imagined putting a dam in a national park. But San Francisco did just that after the 1906 earthquake and fire. Building the O'Shaughnessy Dam was not easy. Some fought the process; others still want to see the dam dismantled. Yet, for more than a 100 years, the dam has been the water center for San Francisco and millions of Californians who rely on pure water and clean energy. But can our Hetch Hetchy water and energy systems survive a changing climate? Emmy Award-winning filmmaker Jim Yager will share his new documentary film, Water from the Wilderness, about the past, present and changing climates and times.