Salmon & Steelhead Recovery Tracker

Sandy (Independent Population)

Oncorhynchus tshawytscha

Abundance

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

Abundance estimates are only available for Clackamas, Sandy and Hood River Spring Chinook. Most available data are from dam counts. Marked fish were not passed above the dams.

Spawning Year Wild Adult Count Nat. Origin Spawners 95% Confidence Interval Abundance Goal Average Abundance
2016 3,490 2,032 1,917
2015 2,772 1,974 1,817
2014 1,444 1,883 1,674
2013 2,188 1,676 1,640
2012 3,070 1,683 1,540
2011 1,150 1,103 1,331
2010 1,391 1,236 1,283
2009 856 1,226
2008 2,721 1,232
2007 1,304 1,064
2006 1,209 990
2005 1,405 944
2004 2,294 907
2003 1,053 821
2002 1,035 777
2001 988 739
2000 564 692
1999 581 721
1998 700 729
1997 935 691
1996 697 636
1995 418 626
1994 653 663
1993 967 637
1992 1,255 588
1991 533
1990 582
1989 415
1988 921
1987 666
1986 255
1985 267
1984 575
1983 872
1982 337
1981 373

Evaluation Thresholds

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

Delisting

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for delisting over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for delisting over that same time period.

Broadsense

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for broad sense recovery over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for broad sense recovery over that same time period.

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 1,917
2015 1,817
2014 1,674
2013 1,640
2012 1,540
2011 1,331
2010 1,283

Evaluation Thresholds

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

Delisting

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for delisting over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for delisting over that same time period.

Broadsense

Pass - The observed spawner abundance is greater than or equal to the abundance modeled for delisting at least six times in any 12-year period and the average observed spawner abundance is greater than or equal to the average modeled abundance for broad sense recovery over that same time period.

Fail - The observed spawner abundance is greater than or equal to the abundance modeled for delisting less than six times in any 12-year period or the average observed spawner abundance is less than the average modeled abundance for broad sense recovery over that same time period.

Hatchery Proportion

The proportion of spawning fish that are of hatchery origin in each lower Columbia River population.

Spawning Year Proportion Hatchery
2016 0.05
2015 0.08
2014 0.13
2013 0.09
2012 0.24
2011 0.67
2010 0.77
2009 0.53
2008 0.45
2007 0.07
2006 0.10
2005 0.15
2004 0.15
2003 0.12
2002 0.18
2001 0.60
2000 0.72
1999 0.71
1998 0.73
1997 0.72
1996 0.73
1995 0.72
1994 0.72
1993 0.72
1992 0.72
1991 0.72
1990 0.63
1989 0.70
1988 0.53
1987 0.52
1986 0.64
1985 0.52
1984 0.53
1983 0.53
1982 0.35
1981 0.66

Average Hatchery Proportion

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

Spawning Year Proportion Hatchery 9-yr. pHOS Avg. pHOS Limit
2015 0.08 0.10
2014 0.13 0.10
2013 0.09 0.10
2012 0.24 0.10
2011 0.67 0.10
2010 0.77 0.10
2009 0.53
2008 0.45
2007 0.07
2006 0.10
2005 0.15
2004 0.15
2003 0.12
2002 0.18
2001 0.60
2000 0.72
1999 0.71
1998 0.73
1997 0.72
1996 0.73
1995 0.72
1994 0.72
1993 0.72
1992 0.72
1991 0.72
1990 0.63
1989 0.70
1988 0.53
1987 0.52
1986 0.64
1985 0.52
1984 0.53
1983 0.53
1982 0.35
1981 0.66

Evaluation Thresholds

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

Delisting

Pass – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average less than or equal to the population specific hatchery stray rate target.

Fail – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average greater than the population specific hatchery stray rate target.

Broadsense

Pass – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average less than or equal to 10 percent.

Fail – Over a nine-year period, the average percentage of the total number of natural spawners that are of hatchery origin is on average greater than 10 percent.