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Dallas Creek Project, Colorado (BR) -21- Project development will cause little change in waterfowl populations. The presence of Ridgway Reservoir may entice additional migrant waterfowl into the area. Some limited nesting may occur. In addition to project impacts on game animal resources, about 4,700 acres of native wildlife habitat will be eliminated through project induced changes in land use. A resultant irreplaceable loss of the associated nongame wildlife populations will occur. These populations will not be assimilated into adjacent habitats and will be lost. Wildlife resource evaluations are summarized in Table III. This summarization shows that without project modification for wildlife purposes, there will be a loss of 809 man-days of hunting and 670 man-days of nonconsumptive recreational wildlife use. Plan of Development for Fish and Wildlife Resources The lessons learned from reservoirs built in the past have shown the need to design outlet works for larger reservoirs, such as Ridgway Reservoir, to provide a method for regulating temperature of released waters. The Ridgway Reservoir outlet works would have a double-level outlet making it possible to draw from two water levels of different water temperature and/or quality. Mixing of these waters would allow the manipulation of temperature and water' quality in the Uncompahgre River downstream from the dam. The maintenance of water temperatures and quality most suitable for trout would help preserve the value of the downstream fishery. Estimated capital costs of these works allocated to fishing purposes would be $460,000 and would be a Section 5 cost. No allocation of operation and maintenance costs has been made to fishery purposes. Maintenance of any quality of fishing in the Uncompahgre River and the forks of Dallas Creek requires stream flow regimens that would provide suitable aquatic habitat to sustain adequate populations of trout. Project provided flows would also prevent future deterioration of habitat quality in project impacted streams by assuring a base flow. The value of these stream releases must be predicated upon maintaining these flows throughout the full length of the channel segments specified.