Sierra Nevada Bighorn Sheep In Yosemite - Mount Warren

Mount Warren herd movement data

S237 - Ewe (kmz)

S239 - Ram (kmz)

Recent Events

• 7/13/2023 The Warren herd appears to have survived the record-breaking snowfall this past winter. We observed 8 ewes and 3 lambs near Virginia Lakes.
• 10/27/2022 Captured and collared 5 ewes and 1 ram. This will greatly increase our ability to monitor the Warren herd.
• 5/28/2021 Successful day looking for lambs. Saw 2 groups of collared ewes looking up at the red rocks from Lundy Road. All collared ewes had lambs, and 5 yearlings were seen, which means all of the lambs from last year made it through the winter.
• 10/24/2018 3 sheep were collared in the Warren herd. This is extremely important in order to track this herds progression and locations on the landscape.
• 7/15/2017 10 bighorn (5 ewes, 4 lambs, 1 ram) in Glines Canyon area of Green Creek. This northern group seems to be faring well.
• 8/24/2016 10 bighorn (5 ewes, 4 lambs, 1 ram) in Glines Canyon area of Green Creek. This northern group seems to be faring well.
• 1/30/2015 S333 (ram) was killed eaten by a mountain lion. This makes 3 rams killed by lions this winter(15-16).
• 8/1/2014 Four lambs observed. The population seems to be rebuilding

View seasonal maps as annotated video below or see Flickr Album (opens in new tab).

Lundy Canyon in Fall (beaver dam in foreground)

Landsat - Satellite Images

The Landsat program offers the longest continuous global record of the Earth's surface by capturing images from space. United States Geologic Survey (USGS) has been using this system since the 1970's. Landsat imagery is taken approximately every two weeks. The image resolution is based on a 30m x 30m pixel size. The data are used for a wide variety of scientific investigations. Our program uses this information to describe snow cover. Images show snow (turquoise), bare ground (brown), and vegetation (green). Images were selected to show differences in habitat use patterns at various times during the year.