Adult fall chinook salmon passage through fishways at lower Columbia River dams, 2002-2005

Radiotelemetry tags were gastrically implanted in fall Chinook salmon Oncorhynchus tshciwytscha to examine behavior trends at hydropower dams from 2002 to 2005. Movements were monitored as fish migrated upstream using radiotelemetry receivers placed along the Columbia River, at the mouths of most tributaries, and throughout fishways at four lower Columbia River dams (Bonneville, The Dalles, John Day, and McNary Dams). Results were examined for interannual and interdam differences, and compared to fall Chinook salmon movements from previous years (Burke et al. 2005). Striking consistencies in fish behavior at individual dams were observed between years.