Most of the herd management areas in Oregon are in the northwest corner of the Great Basin.
Here are some statistics for the state, developed from individual pages at the BLM web site.
- Number of HMAs: 18 (one jointly managed with USFS)
- Total land: 2.9 million acres (mostly public, some private)
- Total animals: 2786 (mostly horses, a few burros, using upper values of AMLs)
- Stocking rate: 1031 acres per animal (0.97 animals per thousand acres)
- Stocking rate at 3X AML: 344 acres per animal (2.91 animals per thousand acres)
The last figure is offered as an estimate of the current situation, as many of the HMAs have more animals than allowed by the upper end of their AMLs.
Livestock grazing was not reported on any of the HMAs, although it presumably occurs on some of them.
The largest HMA is the Coyote Lake / Alvord Tule Springs complex at 553,603 acres, while the smallest is Hog Creek, at 21,844 acres.
Stocking rates vary from 5.0 animals per thousand acres at Cold Springs HMA to 0.4 animals per thousand acres at Warm Springs HMA.