Owned by San Francisco, Hetch Hetchy Reservoir in Yosemite
National Park provides water to nearly 3 million people in 29
cities across the San Francisco Bay Area. The water, provided by
snowmelt via the Tuolumne River, does not require filtration.
Stored in Hetch Hetchy Reservoir behind O’Shaughnessy Dam, the
water is delivered by a gravity based system and aqueduct to the
Hetch Hetchy has generated controversy since it was first
proposed as a source of water following the 1906 San Francisco
earthquake. Congress also had to approve the project because it
was located in a national park. John Muir and the Sierra Club
unsuccessfully fought the reservoir’s establishment since it
required flooding a scenic mountain valley. After its
construction in the 1920s, various groups have lobbied to restore
the Hetch Hetchy Valley to its natural state.
Rare photos show the transformation of Hetch Hetchy Valley from
untouched paradise to home of the O’Shaughnessy Dam, which
supplies some of the country’s cleanest water to 2 million
people in San Francisco and beyond.
Water as a renewable resource is depicted in this 18×24 inch
poster. Water is renewed again and again by the natural
hydrologic cycle where water evaporates, transpires from plants,
rises to form clouds, and returns to the earth as precipitation.
Excellent for elementary school classroom use.
A new look for our most popular product! And it’s the perfect
gift for the water wonk in your life.
Our 24×36 inch California Water Map is widely known for being the
definitive poster that shows the integral role water plays in the
state. On this updated version, it is easier to see California’s
natural waterways and man-made reservoirs and aqueducts
– including federally, state and locally funded
projects – the wild and scenic rivers system, and
natural lakes. The map features beautiful photos of
California’s natural environment, rivers, water projects,
wildlife, and urban and agricultural uses and the
text focuses on key issues: water supply, water use, water
projects, the Delta, wild and scenic rivers and the Colorado
Hetch Hetchy – a Sierra Miwok word for a type of wild grass
– is a valley in Yosemite National Park whose river was
dammed to create a water supply for the San Francisco Bay
Area. The O’Shaughnessy Dam on the Tuolumne River forms Hetch Hetchy
Owned by the city of San Francisco, Hetch Hetchy Reservoir
provides water to 2.7 million residents and businesses in the San
Francisco Bay Area.