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CHAPTER FOUR restrictions on logging procedures would act synergistically, resulting in improvement of the majority of the 14,933 acres of fishery streams in the Planning Area. IMPACTS ON LIVESTOCK GRAZING MANAGEMENT IMPACTS FROM PROPOSED MANAGEMENT ACTIONS Impacts from Livestock Grazing Management. Livestock forage in the Planning Area would be expected to improve in quantity and quality over the life of the plan. This would occur as a result of achieving proper total forage utilization levels in riparian areas and on uplands, implementing AMPs or CRMAPs, maintaining existing treatments and projects in some units, and indirectly, by improved livestock distribution patterns by implementing 4' and 2-112' minimum stubble heights in riparian areas. Impacts from Soils and Water Resource Management. Vegetation treatments designed to increase plant basal cover, and implementing soil erosion and watershed mitigation measures would increase forage and help improve livestock distribution over the life of the plan. Allocation of all additional available forage to meet watershed objectives would potentially result in livestock grazing treatments or projects being deferred or not developed. Impacts from Riparian Znne Management. Managing livestock utilization to maintain a 4" minimum stubble height for key herbaceous forage species on 2,541 suitable acres of riparian zones important for fisheries and sage grouse brood habitat in units E-1, E-2, E-13, E-14, and E-15, would reduce livestock allocations by about 260 AUMs on several allotments. More intensive supervision and operator management would be required in order to phase in these minimum stubble heights. Eliminating livestock grazing on about three miles, or 76 acres, of the North Willow Creek riparian zone to improve big game forage in unit E-7 would reduce livestock utilization by about 38 AUMs. Eliminating livestock grazing on 1/4 mile of the Los Pinos creek and 1/4 mile of the Tomichi Creek riparian zones to improve fisheries in Unit E-15 would reduce livestock allocations by a total of about 46 AUMs on the 4O-acre parcels each of these stream segments crosses. Requiring livestock treatments and management to meet riparian management objectives for fishery resources within riparian zones along about one mile or 24 acres of Pauline Creek in unit E-13, all public land in riparian zone unit E-15, about 4,247 suitable acres, and public land in riparian zone unit E-14 for sage grouse brood habitat improvement, about 2,344 suitable acres, would probably increase costs and time for planning and implementation of treatments, or possibly operators' costs, for livestock management on these lands. Not authorizing grazing or watering on about 200 acres in the riparian area along Cochetopa Creek in unit E-3 in order to help improve recreation settings would make these lands unavailable for future grazing use. Not authorizing domestic sheep grazing on 2,272 suitable acres in unit E-3, for the same reason, would require a change of livestock class to permit cattle only to use these lands. Implementing riparian zone management actions and other mitigation would, over the life of the plan, improve and increase available forage. Impacts frnm Special Status Plant and An1maI Species and Hahltat. Requiring domestic sheep grazing in unit E- 5, 5,947 acres, to be controlled in order to prevent destruction of Uncompahgre fritillary butterfly habitat would increase operators' management intensity, and potentially costs, and would necessitate closer use supervision. Restricting surface disturbance to protect butterfly habitat in unit E-5 would preclude large-scale livestock treatments on 1,072 suitable acres. Not authorizing domestic sheep grazing, or vegetative treatments or maintenance of treatments in unit E-8 in order to protect skiff milkvetch populations from trampling, sheep use, and destruction would require a change in the class of 4-66