Sierra Nevada Bighorn Sheep In Yosemite - Mount Warren

Mount Warren herd movement data


Recent Events

  • 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.
  • 07/15/2017 10 bighorn (5 ewes, 4 lambs, 1 ram) in Glines Canyon area of Green Creek. This northern group seems to be faring well.
  • 08/24/2016 10 bighorn (5 ewes, 4 lambs, 1 ram) in Glines Canyon area of Green Creek. This northern group seems to be faring well.
  • 01/30/2015 S333 (ram) was killed eaten by a mountain lion. This makes 3 rams killed by lions this winter(15-16).
  • 01/30/2015 One ram killed and eaten by a mountain lion.
  • 08/01/2014 Four lambs observed. The population seems to be rebuilding
  • 11/18/2013 On November 1, S89 started traveling north from Shepard's Crest past Excelsior and Summit Lake. By November 4 she made her way into the bowl NE of Camiaca Peak where she has since remained.
  • 09/04/2013 Multiple surveys have consistently turned up one or two ewe groups consisting of 14 animals: 7 adult ewes, 2 yearling ewes, 1 yearling ram, 1 2-year old ram, and 3 lambs. An additional 5 rams in a bachelor group brings the grand total to 19 bighorn.
  • 08/23/2013 After two days of searching for S89, a 9 year old ewe, she was found with a very new lamb. This August born lamb is one of the latest lambs ever observed in the Sierra.
  • 06/15/2013 A partial count, including a public field trip, showed a total of 10 bighorn: 3 adult ewes, 1 yearling ewe and 6 adult rams, no lambs were seen.
  • 03/14/2013 A mountain lion killed two adult bighorn in Lundy Canyon. Heavy predation in this canyon could have devastating effects for this small herd. At this time of year, bighorn sheep are the only significant prey species present in the area. CDFW biologists will closely monitor this situation.

View seasonal maps as annotated video below or see Flickr Album.

Click arrow to play video or link opens in new tab or windowYouTube (Video).
Lundy Canyon in Fall
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.