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. 19 tiger muskie. . For tiger muskie to survive they would have to pass through both channels of Kannah Creek to the Gunnison River where survival may be possible. Tiger muskie share many of the habitat requirements of northern pike. Northern pike are found in the Gunnison River but do not appear to be noticeably impacting native or sportfish populations. . . Harvey Gap Reservoir Harvey Gap Reservoir is filled with water from East Rifle Creek that is diverted through the Grass Valley Canal (Figure 6). The reservoir does not spill. Diversions are managed to keep the reservoir full without spilling. Water drops 50 feet from the Grass Valley Canal into the reservoir and prevents fish escapement through the inlet. All water releases are made into irrigation ditches. All irrigation ditches end at a headgate. Water is only released during irrigation season. The only water that ever reaches the Colorado River is return water from irrigated fields. The average annual drawdown is about 30 feet with a maximum of about 45 feet. Water releases occur from the bottom of the reservoir through one outlet that is at a depth of 53 feet. The reservoir basin has moderately steep sides: Rooted aquatic vegetation does not occur in this reservoir because of the large annual drawdowns (Table 3). Harvey Gap Reservoir is managed for both warmwater and cold water sportfisheries (Table 4). In 1993, Harvey Gap was planted with catchable size rainbow trout and fingerling channel catfish. Other fish species such as black crappie, largemouth bass, bluegill, and smallmouth bass maintain populations through natural reproduction. Northern pike were recently found in Harvey Gap and appear to be reproducing successfully. A large white sucker population along with rainbow trout would provide the preferred forage of soft-rayed fish. Northern pike and tiger muskie could be expected to compete for this forage base. Angler surveys last conducted in 1987 projected total angler use at 11,650 hours with a CPAH of 0.4. Tiger muskie would provide a new sportfish species to the area, although the presence of northern pike in the reservoir probably fills. some demand for a trophy esocid fishery. A northern pike weighing 16 Ibs. was taken from Harvey Gap Reservoir. Fishermen are allowed to wade, float tube, and use boats with 20 hp or less outboard motors. . . . . . .