Craig Pass Closed for the Season; Mammoth to Norris Closed Sept. 14-30
The road linking West Thumb and Old Faithful is closed for the season—traffic should detour through West Thumb, Lake, and Canyon. The road from Mammoth to Norris is closed for two weeks—traffic should detour over Dunraven Pass. More »
Summer 2010 Bison Population Estimate Released
Contact: Al Nash, 307-344-2015
National Park Service
Yellowstone National Park
Yellowstone’s Summer 2010 Bison Population Estimate Released
Yellowstone National Park has completed its annual summer bison population abundance estimate.
The population is estimated to be 3,900 bison. The estimate is based on a series of aerial surveys conducted in June and July.
This year’s calf production represents 15 % of the population. Fifty-six percent of the bison are distributed across the Northern Range this summer, while the remainder are found in the Central Interior herd.
The population was estimated at 3,300 bison last summer; and at 3,000 adult and yearling bison in late winter. The peak population estimate of 5,000 bison was recorded in the summer 2005.
The observed rate of population change this past year is within the natural range of expectation for wild bison. The rate at which wildlife populations increase in abundance is a reflection of the combined effects of reproduction and mortality, and is heavily influenced by age structure of the population, and habitat conditions encountered over the course of time.
The cooperating agencies operating under the IBMP are the National Park Service, the U.S. Forest Service, the Animal and Plant Health Inspection Service, the Montana Department of Livestock, the Montana Department of Fish, Wildlife and Parks, the InterTribal Buffalo Council, the Confederated Salish Kootenai Tribes, and the Nez Perce Tribe. More information on the IBMP can be found at www.ibmp.info/.
- www.nps.gov/yell -
Did You Know?
There are more people hurt by bison than by bears each year in Yellowstone. Park regulations state that visitors must stay at least 25 yards away from bison or elk and 100 yards away from bears.