Tioga & Glacier Point Roads Closed for the Winter
The Tioga Road (Highway 120 through the park) and Glacier Point Road are closed due to snow; they usually reopen late May or June. You can check on current road conditions by calling 209/372-0200 (press 1 then 1). More »
Hydrology and Climate Data Sources
Happy Isles Gaging Station Webcam (provided by the USGS) of the Merced River. This Yosemite webcam is believed to be the first webcam view of a river in the National Park Service. When using the cam, you can zoom in or out.
Merced River: The Pohono and Happy Isles gages are on the main stem of the river, located 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 BLM land, downstream of the park and the confluence of the South Fork of the Merced.
Resources and Further Reading
Yosemite-based Hydrology Videos
These Yosemite-produced videos explore water-related topics:
Volunteer: How to Get Involved: Volunteer in the park's water quality monitoring effort of the Merced River. Help collect water samples that will be tested for nitrate and phosphorous concentrations. Participate 8 a.m.-5 p.m. the first Wednesday of every month (except December and February). Call Katy Warner at 209/379-1421 to sign up.
Did You Know?
Natural fires in Yosemite are often no more than a single burning snag (standing dead tree) or a slow moving, low intensity fire that cleans underbrush from the forest floor. These fires prevent unwanted fires by removing accumulating forest debris that can fuel a larger fire in hot, dry conditions.