Salmon & Steelhead Recovery Tracker

Gorge (Stratum)

The Gorge biogeographic stratum includes Lower Columbia watersheds in Oregon upstream of the Sandy River to the Hood River. There are a total of 3 independent populations in the stratum.

Oncorhynchus kisutch

Abundance

Annual estimates of the abundance of naturally-produced spawners for each stratum.

Spawning Year Nat. Origin Abundance 95% Confidence Interval
2016 452 419
2015 34 34
2014 404 33
2013 712 332
2012 265 161
2011 448 269
2010 1,143 809
2009 533
2008 292
2007 296
2006 599
2005 1,525
2004 126
2003 41
2002 485

Hatchery Proportion

Spawning Year Proportion Hatchery pHOS Comments
2016 0.23
2015 0.42
2014 0.56
2013 0.59 2013 wild estimate was updated in June 2016, because the mark rate was accidentally used to calculate pHOS instead of using the scale data.
2012 0.73
2011 0.63
2010 0.54
2009 0.27
2008 0.43
2007 0.57
2006 0.59
2005 0.63
2004
2003
2002 0.37