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CHAPTER FOUR would disrupt bighorn sheep lambing areas and would force the herd onto marginal habitat. Impacts from Acquisition of Non-Federal Lands. The acquisition of private lands containing crucial elk and deer winter range would prevent the loss of habitat through potential subdivision development and hwnan activities. Impacts from Rights-of-Way Management. Prohibiting rights-of-way development within 114 mile of sage grouse leks would protect these areas from disturbance and possible destruction. CUMULATIVE IMPACTS ON TERRESTRIAL WILDLIFE HABITAT Management actions identified in this alternative would greatly improve wildlife habitat conditions. Big game habitat in all areas would improve through elimination of grazing and implementation of seasonal stipulations for crucial winter range, calving areas, lambing areas, and wildlife habitat management. Upland bird habitat would be enhanced through seasonal and other protective measures within leks and wintering areas. Non-game species habitat would be increased through improvement of riparian areas and increased habitat diversity. IMPACTS ON FISHERY RESOURCES (AQUATIC HABITAT) IMPACTS FROM PROPOSED MANAGEMENT ACTIONS Impacts from Locatable Minerals Management. Mineral entry and location being precluded on 58,369 acres of withdrawn federal mineral estate would prevent possible loss of fishery habitat due to mining activities and associated road construction on effected fISheries. Loss of fishery habitat due to sedimentation and channelization would be greatest if mineral development were to occur in alluvial soils along or in streambanks. Impacts from Saleable Minerals Management. Fishery streams would be protected by mitigating measures designed to limit disturbance to the associated riparian vegetation from this activity on lands available for mineral material disposal (670,065 acres). Impacts from Soil and Water Resonrces Management. Vegetation treatments designed to reduce soil erosion would enhance aquatic habitat by decreasing the amount and frequency of sediments entering the streams. Acquisition of water rights, including instream flows, would ensure sufficient water to maintain the present fish population. Impacts from Livestock Grazing Management. Implementing IGMCs, excluding livestock grazing within some areas, and elimination of season-long livestock grazing use would decrease sedimentation of fishery streams, help stabilize streambanks and increase overhanging cover. Fishery habitat would improve through the improvement of water quality and increases in aquatic vegetation and insects. Impacts from Forest Management. Eliminating commercial timber harvests from riparian areas would protect the associated fishery streams from siltation, channelization and streambank deterioration. Impacts from Recreation Management. The construction of recreation facilities and increased recreational use of fIShery streams would cause the loss or reduction in quality to fishery habitat along 3.5 miles of streams. Impacts from Rights-of-Way Management. Designating lands as rights-of-way avoidance areas or excluding rights-of-way construction on 215,307 acres would help prevent siltation and streambank deterioration on effected fISheries. CUMULATIVE IMPACTS ON FISHERY RESOURCES (AQUATIC HABITAl) Management actions described in this alternative, primarily the protection of streams from construction activities and implementing IGMCs would enhance 4-20