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. 14 . Green Mountain Reservoir Green Mountain Reservoir is managed as a replacement water reservoir on the Colorado River system and for hydroelectric generation by the U.S. Bureau of Reclamation (figure 4). It is a main channel impoundment on the Blue River. The reservoir is filled every year but is managed not to spill. The last spill was in 1984. When Wolford Mountain (Muddy Creek) Reservoir construction is completed, it will reduce the chances of Green Mountain spilling in the future because diversions from Dillon Reservoir to the East Slope will increase. The average annual drawdown is 60 feet with a maximum of about 80 feet. All releases are through the outlet which is located at a depth of 150 feet at full pool. The reservoir basin is moderately steep sided with some shallow flat areas. Rooted aquatic vegetation is not present because of the large annual drawdowns (Table 3). Green Mountain Reservoir is managed as a coldwater sportfishery (Table 4). In 1993, the reservoir was stocked with catchable size rainbow trout, kokanee salmon, and splake. Generally, growth and survival is not good for trout and salmon in Green Mountain Reservoir. Longnose suckers and to a lesser extent, white suckers, are present in the reservoir in large numbers. Both sucker species are soft-rayed fishes and would be a preferred tiger muskie forage. Both are non-native species in that drainage. The coldwater sportfishery could improve if tiger muskies were planted in the reservoir and reduced the dense sucker populations. Angler surveys conducted from May 27 to October 7, 1989, projected angler use at 111,780 hours with a CPAH of 0.53. Although tiger muskie would provide a new sportfish species to the area, the presence of northern pike in nearby Williams Fork Reservoir probably fills some demand in the area for a trophy esocid fishery. Tiger muskie could improve the Green Mountain Reservoir coldwater sportfishery by reducing the large sucker populations, which could make more productivity available to trout and salmon. The nearest endangered fish habitat is in the Colorado River near Rifle, Colorado, a distance of approximately 120 miles. Tiger muskie could only escape during an infrequent spill event. The outlet is too deep for tiger muskie escapement. Escaped fish would go down the Blue River to the Colorado River, where Wild Trout and Gold Medal fisheries and native fishes could be impacted. The nearest endangered fish habitat is in the Colorado River near Rifle, Colorado, a distance of approximately 120 river miles. The Wild Trout and Gold Medal . . . . . . . .