• View of Half Dome and Washington Column in Yosemite Valley

    Yosemite

    National Park California

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  • Tioga Road is Closed for the Winter

    The Tioga Road (Highway 120 through the park) is closed due to snow; it usually reopens in late May or June. You can check on current road conditions by calling 209/372-0200 (press 1 then 1). More »

Study the Scientist: A Hydrologist

Hydrologist Jim Roche manages Yosemite's water quality monitoring program and works to protect the park's water resources, including two Wild & Scenic rivers: the Merced and the Tuolumne rivers. He came to Yosemite from Death Valley National Park in 2003 and had worked previously in Yellowstone and Great Basin national parks, Big Cypress National Preserve, and as a Peace Corps volunteer in Gabon, Central Africa. (3 minutes 20 seconds)
 
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View Yosemite's other "Study the Scientist" videos to watch resource rangers describe their jobs.

  • See wildlife biologist Sarah Stock, who specializes in ornithology
  • See social scientist Bret Meldrum, who studies the quality of a visitor's park experience
  • See fire archeologist Jun Kinoshita, who functions as both a firefighter and an archeologist
  • See botanist Martin Hutten, who specializes in lichens and invasive plants
  • See historical architect George Jaramillo, who preserves the park's historical structures

Did You Know?

American black bear

Black bears in Yosemite are active both day and night. Most bears that rely on natural food sources are active during the day. However, those that get food from people are often active at night, when they can quietly sneak around and grab unattended food. More...