Sport Fish Division staff from the Alaska Department of Fish and Game operated a weir to count outmigrating cutthroat trout Oncorhynchus clarki and Dolly Varden Salvelinus malma from Windfall Creek in spring 1997, and counted a total of 616 cutthroat trout, 34,074 Dolly Varden, and nine steelhead Oncorhynchus mykiss during 10 April through 31 May 1997. Fifty-eight sexually mature cutthroat trout outmigrating from Windfall Lake were radio-tagged. Estimates based on radiotelemetry data indicated that approximately 27% (SE 1.3%) of the cutthroat trout leaving Windfall Lake were sea-run fish and the remainder were resident trout. Of the 58 cutthroat trout fitted with radio transmitters; 25 were tagged with external tags and another 25 were fitted with esophageal, stomach-implant tags in order to compare retention rates between tag types. Results from the differently tagged groups indicated that 28% of the internally equipped fish regurgitated the tags, whereas only one fish in the externally tagged group was lost to mortality. A mark-recapture experiment conducted in-season to estimate the abundance of resident trout in Windfall Lake was attempted after emigrating fish had departed, but catches were not sufficient to provide an accurate estimate.