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the Yampa River from the Green River downstream. If records of early stocking are inaccurate there may have been unreported stockings in the Yampa River basin prior to 1977. In 1970, the state of Colorado stocked northern pike in a variety of small impoundments in northwest Colorado and although no specific records appear to exist, it is conceivable that a small reservoir in the Yampa drainage could have received fish in 1970 ( P. Martinez, pers. comm.). A reliable angler from Craig recalled northern pike in Ralph White Reservoir located on Fortification Creek north of Craig in the early 1970s; but, no stocking records could be found for northern pike in Ralph White and creel samples of the reservoir from 1973 through 1979 did not report northern pike (S. Hebein, pers. comm.). There are no known reports of northern pike in the Green River until well after they were found in the Yampa River, suggesting that northern pike did not infiltrate from downstream and implying a Yampa River origin. Although there is much speculation, the initial source of northern pike in the Yampa River remains unknown, however their initial increase and range expansion occurred in the 1980s, after their legal introduction into Elkhead Reservoir. Reconstructing the origin and expansion of northern pike from events that occurred over 25 years ago is problematic; even recent expansions in the Yampa River basin are difficult to document. Northern pike presently inhabit upstream Catamount and Stagecoach reservoirs, and their origin in these waters is undocumented and likely illicit. Catamount Reservoir was filled in 1979 and Stagecoach Reservoir further upstream, was filled in 1989. Northern pike were first observed in Catamount Reservoir in 1995 (K. Rogers, pers. comm.). Although there is speculation that northern pike 5