Salmon & Steelhead Recovery Tracker

Middle Fork Willamette River (Independent Population)

Middle Fork Willamette River Independent Population

Oncorhynchus tshawytscha

Abundance

Annual estimates of the abundance of naturally-produced spawners for Upper Willamette River populations.

Spawning Year Wild Adult Count Nat. Origin Spawners 95% Confidence Interval Abundance Goal Average Abundance
2016 226 176
2015 139 178
2014 91 178
2013 59 190
2012 175
2011 181
2010 188
2009 110
2008 344
2007 59
2006 417
2005 118
2004 257
2003 141
2002 235

Average Abundance

Twelve years of data are necessary to evaluate this metric. Data will become available after a suitable number of years of monitoring have occurred.

Spawning Year Average Abundance Avg. of Ab.Goal
2016 176
2015 178
2014 178
2013 190

Hatchery Proportion

The proportion of spawning fish that are of hatchery origin in Upper Willamette River populations.

Spawning Year Proportion Hatchery
2016 0.14
2015 0.88
2014 0.87
2013 0.94
2012 0.93
2011 0.65
2010 0.65
2009 0.83
2008 0.59
2007 0.85
2006 0.76
2005 0.74
2004 0.61
2003 0.51
2002 0.77

Average Hatchery Proportion

Nine years of data are necessary to evaluate this metric. Data will become available after a suitable number of years of monitoring have occurred.

Spawning Year Proportion Hatchery 9-yr. pHOS Avg. pHOS Limit
2016 0.14 0.72 0.10
2015 0.88 0.80 0.10
2014 0.87 0.79 0.10
2013 0.94 0.77 0.10
2012 0.93 0.73 0.10
2011 0.65 0.69 0.10