2009 report submitted to Bonneville Power Administration (BPA)

The Columbia River study, continued now for four years, shows no significant difference in survival between Chinook smolts travelling through either 4 or 8 Columbia River dams.  The addition of an early release group of barged smolts in 2009 indicated no difference in survival despite the length of time between the first and last release groups (approximately 1 month), but some behavioral variations were observed.

Read the report here.