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?
Rockfall events have helped shape many of the outstanding features along Yosemite Valley's walls, including Royal Arches, North Dome, and Half Dome. Giant talus slopes that slant away from the Valley walls accumulate debris with each rockfall event.