Adam Lindquist
The Washington Department of Fish and Wildlife (WDFW) has operated an eight-foot diameter rotary screw trap in the Nisqually River at river mile 12.8, near the Centralia City Light Yelm Hydro Powerhouse since 2009 to monitor outmigrating juvenile salmonids.
The primary objectives of the trap are to estimate abundance and document total catch, run timing, size, and age composition of outmigrating juvenile Chinook salmon and steelhead.
Our secondary objectives are to estimate abundance and document total catch, run timing, size, and age composition of outmigrating juvenile Coho, Chum, and Pink Salmon.
Information collected at the Nisqually River rotary screw trap monitoring project provides critical abundance and life history information for the salmon and steelhead stocks within the river. These data coupled with adult return data can be used to measure key survival and productivity metrics to assess management practices and evaluate recovery efforts.