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on preliminary results of hydrologic and aquatic analyses was held on March 1, 1985. at the Federal Center in Denver, Colorado. for all interested agencies and individuals. Details of the scoping process are presented in Chapter 6. The scoping process resulted in a determination that analytical work was requi~ed in eight disciplinary_ areas: hydrology and reservoir system operations, river hydraulics, water quality, aquatic biology. wildlife biology. riparian and wetland vegetation, recreation assessment, and social-economic assessment. The major issues addressed are: 1. Social and economic effects in the affected area. particularly as related to summer and winter recreation use. 2. Physical and chemical effects on aquatic communities, particularly fisheries. in Green Mountain Reservoir and streams above and below the reservoir. 3. River and stream channel stability. 4. Effects on terrestrial wildlife and riparian vegetation. 5. Effects of reservoir drawdown and pool levels, as related to recreation use. 6. Physical capacity of small tributaries in the Fraser. Blue, and Eagle river drainages to deliver water for snowmaking and other uses during the winter months. 7. Effects of legal and policy constraints such as recommended or appropriated instream flows on the capability of small streams to deliver water. 8. Effects on threatened and endangered species. 9. Compliance with authorizing legislation. 1.4 Operating Policy and Revisions Senate Document 80 (Act of August 9. 1937) outlined the construction and operating conditions for the Colorado-Big Thompson project. Construc- tion requirements included storage on the Blue River at Green Mountain Reservoir. located about 13 miles southeast of Kremmling. Colorado (Fig. 1.1). The reservoir would be used to replace watez diverted to the eastern 1-7