From July 8 to September 25, 1996, and June 14, to August 11, 1997, a resistance board weir was operated on Beaver Creek, a tributary of the Yukon River. In 1996 a total of 654 chum salmon Oncorhynchus keta and 192 chinook salmon Oncorhunchus tshawytscha were counted. During 1997 a total of 34 summer chum and 315 chinook salmon were counted. Other resident species observed were Arctic grayling Thymallus arcticus, northern pike Esox lucius, and longnose sucker Catostomus catostomus. Installation of the weir was later than scheduled in 1996, possibly resulting in portions of the chinook salmon run being missed. Water levels and discharge were significantly higher in 1996 than 1997, possibly affecting the timing of the runs.