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CHAPTER FOUR cattle only in affected allotments, and would require additional livestock facilities if cattle are grazed. Not authorizing domestic sheep use on 46,042 suitahle acres in unit B-ll in order to help improve and maintain pronghorn antelope habitat would also result in a change of class of livestock to callie only. Restricting livestock management on 80,918 suitable acres and restricting treatments on 185,918 suitable acres for wildlife management would possibly increase costs and time for planning and implementation or operator's costs for livestock management. Eliminating two-week fall livestock use and permitting only four days of fall use in GMUs 55 and 551 could result in a reduction of AUMs or increases in the springtime season of use. Impacts from Fishery Resources (Aquatic Hahitat Management). Pursuing and acquiring instream flow appropriations for fishery streams and implementing fishery resource mitigating measures in activity plans to improve upon or prevent damage to or loss of fishery stream channels and associated riparian resources would indirectly improve forage quantity and quality, over the life of the plan. Other companion impacts from fishery resource management are discussed under Impacts from Riparian Zone Management. Impacts from Fnrest Management. Commercial timber and woodland harvests would, over the life of the plan, increase forage and help improve livestock distribution on some of the 39,442 acres of suitable commercial forest lands and 24,405 acres of suitable woodlands available for harvest. Mitigating measures and harvest restrictions, especially within riparian areas, would help limit removal of forage in affected areas during harvesting of forest products. Impacts from Recreation Management. Restricting livestock grazing treatments on about 43,944 acres and restricting livestock administration on about 31,007 acres to maintain and enhance recreation settings would limit the scope of these future proposals and possibly increase BLM's or operator's management and use supervision time or costs. Designation of 48,633 acres of public land as closed to OHV traffic, and limiting OHV traffic on 92,927 acres to designated routes yearlong would reduce livestock harassment and management COncerns. Eliminating grazing on 320 acres (167 suitable) in allotment 6401 along the Slate River would result in a reduction of about 83 AUMs. Impacts from Transportation and Access. Acquiring access into seven new acres would improve livestock grazing administration, but 5 of the 7 would be for public access, which would result in some degree of additional livestock harassment and vandalism to livestock facilities. Impacts from Disposal of Public Lands. Disposal of 3,129 acres of public lands on tracts identified for disposal which are currently grazed by domestic livestock would result in a reduction or loss of 209 AUMs. CUMULATIVE Ir"PACTS ON LIVESTOCK GRAZING MANAGEMENT Eliminating or not authorizing livestock grazing, implementing minimum stubble heights and seasonal grazing restrictions, and disposal of public lands would result in a net decrease of 5,480 AUMs in the Planning Area, and a total grazing preference of 41,948 AUMs. Long-term livestock forage productivity and livestock distribution would be improved as a result of vegetative treatments and improvements in forage quality and quantity. IMPACTS ON FOREST MANAGEMENT IMPACTS FROM PROPOSED MANAGEMENT ACTIONS Impacts from Forest Management. Approximately 39,442 acres of suitable commercial forest lands and 24,405 acres of suitable woodlands would be available for harvest. This would result in an annual harvest of 1,189 MBF of commercial forest products and 505 oords of fuelwood. Impacts from Riparian Zone Management. Restrictions on timber harvests within riparian areas would remove 250 acres from the harvest base, 4-22