Adult Salmon Runs and Streamflow Data at a Resistance Board Weir on Beaver Creek, Alaska 1998-2000

From July 6 to July 7, 1998, July 9 to August 8, 1999, and July 3 to August 14, 2000, a resistance board weir was operated on Beaver Creek, a tributary to the Yukon River. In 1998 high water washed out the weir trap within 18 hours of its installation, and as a result no data were collected. In 1999, 75 summer chum salmon (Oncorhynchus keta) and 128 chinook salmon (Onchorhynchus tshawytscha) were counted through the weir. In 2000, 11 summer chum salmon and 114 chinook salmon were counted through the weir. In all years when data were collected there was a disparity between numbers of male and female fish, with males outnumbering females. Mean monthly discharges in Beaver Creek ranged from 22 cms in June 1999 to 98 cms in August 1998. Monthly discharges were generally above the 13-year mean in 1998 and 2000, and below the 13-year mean in 1999. Salmon counts were highest in July following daily discharges that exceeded the mean.