Windspeed
Humidity
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.
Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change | 0.03% |
Percent of Normal | 100% |
Minimum |
3,685.68 ft
2008-04-13 |
Maximum |
3,807.48 ft
2011-07-22 |
Average | 3,751 ft |
Discharge | Stage | Elevation | |
TUOLUMNE R BL EARLY INTAKE NR MATHER CA
2025-02-06T02:45:00.000-08:00 |
94cfs | 3.63ft | 2205ft |
TUOLUMNE R A WARDS FERRY BR NR GROVELAND CA
2016-12-20T08:30:00.000-08:00 |
21000cfs | ft | 849ft |
CHERRY C BL DION R HOLM PH
2025-02-06T02:45:00.000-08:00 |
994cfs | 8.97ft | 2155ft |
MF SAN JOAQUIN R NR MAMMOTH LAKES CA
2025-02-06T03:00:00.000-08:00 |
32cfs | 3.01ft | 7593ft |
CHERRY C NR EARLY INTAKE CA
2025-02-06T02:45:00.000-08:00 |
93cfs | 2.54ft | 2360ft |
TUOLUMNE R AB EARLY INTAKE NR MATHER CA
2025-02-06T02:45:00.000-08:00 |
93cfs | 12.58ft | 2443ft |
BIG C DIV NR FISH CAMP CA
2012-10-01T23:45:00.000-07:00 |
0cfs | 0.05ft | 5387ft |