Salmon & Steelhead Recovery Tracker

Lower Columbia (ESU)

The Lower Columbia River Coho ESU includes all populations of coho salmon in the Columbia River and its tributaries in Washington and Oregon, from the mouth of the Columbia up to and including the Big White Salmon and Hood Rivers. It also includes the Willamette River to Willamette Falls.

The State of Oregon only monitors populations occurring in Oregon. There are eight recognized populations of coho in the Lower Columbia ESU, all of which are considered to be functionally independent. Lower Columbia coho were listed as threatened on June 28, 2005.

Oncorhynchus kisutch

Abundance

Annual estimates of the abundance of naturally-produced spawners.

Spawning Year Nat. Origin Spawners 95% Confidence Interval
2016 4,897
2015 3,083
2014 22,512
2013 6,404 709
2012 4,377 940
2011 8,361 1,166
2010 7,794 1,649
2009 12,799 1,187
2008 4,992 918
2007 6,126 537
2006 6,425 665
2005 4,822 957
2004 5,627 663
2003 5,343 431
2002 4,026 982

Harvest

Fishing Year Harvest Rate
2016 0.09
2015 0.24
2014 0.16
2013 0.14
2012 0.14
2011 0.11
2010 0.11
2009 0.19
2008 0.07
2007 0.21
2006 0.15
2005 0.18
2004 0.20
2003 0.25
2002 0.18
2001 0.30
2000 0.35
1999 0.27
1998 0.16
1997 0.14
1996 0.11
1995 0.23
1994 0.07
1993 0.47
1992 0.50
1991 0.63
1990 0.80
1989 0.81
1988 0.80
1987 0.82
1986 0.64

Hatchery Proportion

Spawning Year Proportion Hatchery pHOS Comments
2016 Youngs Bay and Big Creek were not sampled in this year so it is not possible to calculate an estimate for the ESU. Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2015 Youngs Bay and Big Creek were not sampled in this year so it is not possible to calculate an estimate for the ESU. Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2014 Youngs Bay and Big Creek were not sampled in this year so it is not possible to calculate an estimate for the ESU. Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2013 Youngs Bay and Big Creek were not sampled in this year so it is not possible to calculate an estimate for the ESU. Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2012 0.22 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2011 0.18 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2010 0.34 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2009 0.26 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2008 0.26 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2007 0.18 Hatchery fish were excluded from the area above North Fork Dam which contains most of the spawning habitat for the Clackamas population.
2006 0.70 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 0.42 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 0.26 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 0.20 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 0.63 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.