Salmon & Steelhead Recovery Tracker

Cascade (Stratum)

The Cascade biogeographic stratum includes Lower Columbia watersheds in Oregon from the Clackamas River to the Sandy River. There are a total of 2 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 2,567 377
2015 2,227 3,033
2014 16,612 3,032
2013 3,869 441
2012 2,745 891
2011 5,748 1,024
2010 2,658 538
2009 9,475 1,018
2008 2,971
2007 4,295
2006 4,387
2005 2,157
2004 4,087
2003 3,855
2002 2,363

Hatchery Proportion

Spawning Year Proportion Hatchery pHOS Comments
2016 0.07
2015 0.10 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2014 0.10 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2013 0.04 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2012 0.07 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2011 0.09 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2010 0.48 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2009 0.25 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2008 0.32 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2007 0.13 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2006 0.76 Hatchery fish were excluded from the areas above North Fork Dam and Marmot Dam which contain most of the spawning habitat for the Clackamas and Sandy populations.
2005 0.19 Hatchery fish were excluded from the areas above North Fork Dam and Marmot Dam which contain most of the spawning habitat for the Clackamas and Sandy populations.
2004 0.14 Hatchery fish were excluded from the areas above North Fork Dam and Marmot Dam which contain most of the spawning habitat for the Clackamas and Sandy populations.
2003 0.07 Hatchery fish were excluded from the areas above North Fork Dam and Marmot Dam which contain most of the spawning habitat for the Clackamas and Sandy populations.
2002 0.57 Hatchery fish were excluded from the areas above North Fork Dam and Marmot Dam which contain most of the spawning habitat for the Clackamas and Sandy populations.