The Pohono and Happy Isles gages are located on the main stem of the river in Yosemite Valley. The Wawona gage is on the South Fork of the Merced, near the southern boundary of Yosemite National Park. The Briceburg gage is on Bureau of Land Management land, downstream of the park and downstream of the confluence with the South Fork Merced River.
The Grand Canyon of the Tuolumne gage is located just upstream of Hetch Hetchy Reservior, while a second gage is located just downstream of O'Shaughnessy Dam. Data are also available at Falls Creek, a tributary that flows into Hetch Hetchy from the north, and at Tuolumne Meadows, in the Yosemite high country.
Access weather data from stations in Yosemite National Park:
Yosemite Observer Dashboard: Physical Sciences
Visual, interactive information about current weather, stream flow, fires, and air quality conditions; all on one site!
Yosemite Hydrology Videos
These Yosemite-produced videos explore water-related topics:
Resources and Further Reading
Last updated: August 22, 2023