HETCH HETCHY RES A HETCH HETCHY CA

Reservoir Levels Weather Hydrology


Hetch Hetchy Reservoir, located in California's Yosemite National Park, is a crucial source of water for the San Francisco Bay Area. The reservoir was created in 1923 when the O'Shaughnessy Dam was built across the Tuolumne River. The hydrology of the area is primarily influenced by the Sierra Nevada Mountains and the Pacific Ocean, which provide a reliable and consistent snowpack that feeds the water supply. The Hetch Hetchy Reservoir is fed by the Tuolumne River and also receives water from the Cherry Creek and Falls Creek watersheds. The water from the reservoir provides drinking water to over 2.6 million people and supports agricultural and recreational activities. Despite controversy over the dam's construction, the Hetch Hetchy Reservoir has become an essential resource for California's Bay Area.

May 28, 2024

°F

°F

mph

Windspeed

%

Humidity

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0.02%
Percent of Normal 100%
Minimum 3,685.68 ft
2008-04-13
Maximum 3,807.48 ft
2011-07-22
Average 3,778 ft

Explore the Interactive Map

View recreational hotspots like fishing, camping, and parks, alongside climate-related data such as river levels, snowpack, and weather forecasts. Enjoy 3D mapping for an immersive experience, and switch to satellite view for a detailed look at your favorite spots. Simply click, explore, and discover nature like never before!

5-Day Weather Forecast

16-Day Weather Forecast

Nearby Streamgauges

140

Cubic Feet Per Second

208

Cubic Feet Per Second

3350

Cubic Feet Per Second

95

Cubic Feet Per Second