The Sierra Nevada mountain range lies almost entirely within the eastern portion of California. The Sierra are not only a source of breathtaking natural beauty like Yosemite Valley and Lake Tahoe, but its snow pack provides the majority of our state's water supply. In the first installment of Huell's new series "California's Water," not only does he learn how the mountain runoff makes its way to our faucets, but how changes in our climate are significantly impacting the Sierras and how California will adapt to these changes.