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. 29 . exists. It is also unknown whether tiger muskie would reduce the abundance of white sucker by being a more efficient predator than northern pike. It is unlikely tiger muskie would measurably influence the yellow perch fishery because perch are not a preferred food item. Tiger muskie that escape Sanchez Reservoir would enter Ventero Creek which is stocked with creel-sized rainbow trout. Ventero flows into Culebra Creek about one mile downstream. Culebra Creek is managed for quality-sized brown and rainbow trout fishing. A catch and release, fly and lure only regulation is in effect and fingerling rainbow trout are stocked. This area is privately owned but open to public fishing through CDOW private stocking agreements with local landowners. Recent electrofishing on Culebra Creek and assessment of a small fish kill on Ventero Creek showed no coolwater fish escapement form Sanchez Reservoir. If this remains the case, it seems unlikely that tiger muskie would pose much threat to the trout fishery in the two creeks below the reservoir. Further downstream, a series of water diversions completely de-water Culebra Creek and make it next to impossible for escaped fish from Sanchez Reservoir to reach the mainstem of the Rio Grande and come into contact with native fish. . . . . Williams Fork Reservoir Williams Fork Reservoir is managed as a replacement water reservoir on the Colorado River system by the Denver Water Department. It is a main channel impoundment on the Williams Fork river (Figure 10). The management objective is to fill the reservoir each year by July 1 but not to spill water. The reservoir spilled in 1983, 1984, and 1993. All water releases are made through the outlet which is approximately 150 feet below the surface elevation of the reservoir. The average annual drawdown is about 30 feet. The reservoir basin is wide, flat, and shallow at the upper end, tapering to a steep and narrow configuration near the dam (Table 3). Rooted aquatic vegetation does not occur in the reservoir because of the large annual drawdowns. Williams Fork Reservoir is managed as a coldwater sportfishery (Table 4). In 1993, the reservoir was stocked with catchable size rainbow trout and kokanee salmon. Northern pike were planted in the reservoir in 1973 and have maintained a population since that time by natural reproduction. The reservoir contains white and longnose suckers, both of which are preferred soft-rayed forage for esocids. The white sucker population is comprised mainly of large (> 12 . . . .