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Rock Springs Field Office
Release Date: 10/24/11
Contacts: Serena Baker,    

Divide Basin Wild Horse Gather Begins Next Week

The Bureau of Land Management (BLM) Rock Springs Field Office will begin a wild horse gather in the Great Divide Basin (Divide Basin) Herd Management Area (HMA) north of Interstate 80, and east of Rock Springs, Wyo. on or about Tuesday, Oct. 25.  

The Divide Basin HMA  is located in the checkerboard pattern of mixed public and private land ownership. There is no anticipated closure of public lands, except if deemed necessary due to safety concerns. Temporary road closures may be needed to allow movement of wild horse herds.  

Low flying aircraft will also be present in the area. BLM requests aviation enthusiasts avoid flight patterns through the Divide Basin area as air traffic could pose a safety risk. Helicopters used in gather operations often have to change course and altitude quickly. 

Up to 1,476 wild horses are expected to be gathered during an approximately four week period. The gather will reduce the current population of nearly 1,640 wild horses to the appropriate management level (AML) of between 415-600 animals. All mares released will be treated with the Porcine Zona Pellucida (PZP) fertility control vaccine. Sex ratios will also be adjusted favoring stallions to mares. The gather will conclude when the designated number of excess wild horses has been removed from the HMA. Divide Basin was last gathered in August 2007. 

BLM will be offering as many public viewing opportunities as possible during the gather. If interested in viewing the gather, please contact Serena Baker,, to be added to the anticipated visitors’ log. Only individuals listed on the visitors’ log will be contacted with daily viewing sites, meeting times and locations. Please read the “Know Before You Go” tip sheet at: Public viewing sites will be designated a safe distance from wild horse trap sites, and outside the aircraft flight plan. 

Public land users, including hunting enthusiasts and recreationists, may see wild horse gather operations in the Divide Basin area. Please be advised that gather operations are fluid and may change at any time. Monitor the BLM website for the most up-to-date information:  

The BLM manages more than 245 million acres of public land, the most of any Federal agency. This land, known as the National System of Public Lands, is primarily located in 12 Western states, including Alaska. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. The BLM's mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations. In Fiscal Year 2015, the BLM generated $4.1 billion in receipts from activities occurring on public lands.

Rock Springs Field Office   280 Hwy 191 N.      Rock Springs, WY 82901   

Last updated: 10-24-2011