WM-3. Exceptions to the prohibition on motorized and mechanized uses may be allowed for such wildlife management activities as approved by the Field Manager, and when such motorized and mechanized equipment is determined to be the minimum tool needed to do the job. Such activities will be evaluated on a case-by-case basis as the need arises in the Big Horn Mountains, Hummingbird Springs, and Harquahala Mountains wilderness areas. Existing wilderness management plans will guide wildlife management and other activities within Hells Canyon and Hassayampa River Canyon wilderness areas.

WM-4. In the absence of group size limitations in existing wilderness or activity plans, group size for casual use activities will be limited to 25 people. BLM will evaluate requests for groups of more than 25 people on a case-by-case basis to ensure that resources and wilderness values are protected. Groups exceeding 25 people will require prior written authorization from the authorized officer. A Special Recreation Permit will be required for groups over 50 people.

WM-5. Commercial recreation and vending operations are not allowed in the Harquahala Mountains, Hummingbird Springs, and Big Horn Mountains wilderness areas, (including, but not limited to, such activities as guided horse rides or guided hikes) except for guided hunt and outfitter services. Organized non-commercial activities will be allowed on a case-by-case basis when consistent with wilderness management objectives.

WM-6. Commercial recreation operations may be allowed in the Hassayampa River Canyon and Hells Canyon wilderness areas when such activities conform to wilderness management plans, resource protection, and wilderness management objectives, and may be performed to the extent necessary for activities which are proper for realizing the recreational or other wilderness purposes of the areas.

WM-7. Develop and adopt measurement standards for limits of acceptable change for trail conditions, visitor-to-visitor encounters, vegetation changes, Arizona Land Health Standards, and approved motorized/mechanized activities. Exceeding the limits of acceptable change could result in implementing actions such as the following: