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~;j:3~7 Clear-cutting decadent aspen would improve big game habitat by increasing forage and rejuvenating old stands. Impacts from Recreation Management Development of campsites and the associated increase in recreation use along Cochetopa Creek would result in the displacement of bighorn sheep within 1J2 mile of these campsites and use areas and would deter raptor use. Designating 600 acres of public land within the Sapinero State Wildlife Area as closed to ORV use would prevent disturbance to big game and big game habitat from this activity. Limiting ORV use from December 1 through March 31 to designated roads on 74,707 acres of crucial elk and deer winter range would prevent disturbance to these animals during the most critical portion of the year. Impacts from Transportation and Access. Acquiring public road access into the Rock Creek Park area would disrupt bighorn sheep lambing areas and would force the herd onto marginal babitat. Development of roads in riparian areas would eliminate valuable forage and cover for both game and non.game species. Impacts from Disposal of Federal Lands. Disposal of 2,000 acres of crucial elk and deer winter range and subsequent development would increase utilization on the remaining area and decrease the quality of winter habitat. Impacts from Acqulsltlon 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 human activities. CUMULATIVE IMPACTS ON TERRESTRIAL WILDLIFE HABITAT Mineral development, land treatment projects that remove browse species, disposal of public lands, and DRV use would result in a loss of habitat for elk, deer, sage grouse, and non-game species. Bighorn ALTERNATIVE C IMPACTS sheep populations could be drastically reduced if disease transfer from domestic sheep occurs between the two sheep species. IMPACTS ON FISHERY RESOURCES (AQUATIC HABITAT) IMPACTS FROM PROPOSED MANAGEMENT ACTIONS Impacts from Locatable Minerals Management Surface disturbance from locatable mineral activity would potentially reduce the quality of, or result in, a loss of fishery habitat. This habitat loss and the reduction in quality from sedimentation and channelization due to mining activity and associated road construction would be greatest if development were to occur in alluvial soils along or in stream banks. Impacts from Saleable Minerals Management Degradation or some loss of fIShery habitat or reduction in fishery habitat quality would result if surface disturbance associated with mineral material disposal occurs in alluvial soils or in stream channels. Impacts from Soil and Water Resources Management. Vegetation treatments designed to reduce ~oil erosion would enhance aquatic habitat by decreasmg 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 I~~len:'enting .total forage utilization limits, including utilizallon by livestock, would decrease sedimentation of fishery streams, help stabilize stream banks and increase overhanging cover. Fishery habitat would impr~ve throu~ .the .improvement of water quality and mcreases m npanan vegetation and insects. Impacts from Forest Management. Timber harvests and associated activities, such as road, skid trail and . ' stagmg area construction along fishery streams would remove stream bank vegetation and result in an increase in sedimentation and alteration of stream 4-33