The Alaska Department of Fish and Game-Division of Sport Fish and the National Park Service-Katmai National Park and Preserve conducted a cooperative project to monitor the rainbow trout fishery in the upper Alagnak River. A creel census during 8-30 June 1997 documented that 159 angler-days (792.5 hours) of effort occurred at the upper Alagnak River, and that 935 rainbow trout Oncorhynchus mykiss were caught and released. Overall CPUE was 1.18 fish per hour. No sport fishing effort via trolling for lake trout Salvelinus namaycush at the outlet of Kukaklek Lake occurred during the June 1997 creel census period. The typical angler on the upper Alagnak River was guided, non-resident, and fished from shore. Continued monitoring of the fishery and changes to the sampling design are recommended to ensure that the rainbow trout population remains healthy in the Alagnak River.