Salmon & Steelhead Recovery Tracker

Clackamas (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 4,328 1,387 2,083
2015 3,003 1,006 2,155
2014 1,199 743 2,186
2013 2,740 751 2,247
2012 2,201 764 2,140
2011 2,035 665 2,028
2010 1,604 743 1,886
2009 967 1,799
2008 2,085 1,760
2007 1,510 1,768 258 1,616
2006 1,023 1,234 211 1,545
2005 2,295 2,729 434 1,531
2004 5,196 6,157 961 1,441
2003 3,381 4,299 918 1,125
2002 1,929 2,256 327 995
2001 1,459 946
2000 846 919
1999 342 951
1998 555 998
1997 504 1,012
1996 353 1,026
1995 652 1,087
1994 859 1,119
1993 1,217 1,144
1992 1,398 1,141
1991 1,823 1,095
1990 1,347 963
1989 1,135 864
1988 1,229 784
1987 908 696
1986 715 632
1985 674 588
1984 1,087
1983 1,033
1982 1,157
1981 1,187
1980 844
1979 235
1978 166
1977 173
1976 172
1975 144
1974 179

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 2,083
2015 2,155
2014 2,186
2013 2,247
2012 2,140
2011 2,028
2010 1,886

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 0.03
2015 0.05
2014 0.05
2013 0.04
2012 0.06
2011 0.10
2010 0.07
2009 0.08
2008 0.08
2007 0.29
2006 0.24
2005 0.38
2004 0.22
2003 0.22
2002 0.31
2001 0.67
2000 0.67
1999 0.67
1998 0.67
1997 0.67
1996 0.67
1995 0.67
1994 0.67
1993 0.67
1992 0.67
1991 0.67
1990 0.67
1989 0.67
1988 0.67
1987 0.67
1986 0.67
1985 0.67
1984 0.67
1983 0.67
1982 0.67
1981 0.67
1980 0.67
1979 0.67
1978 0.67
1977 0.67
1976 0.67
1975 0.67
1974 0.67

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 0.05 0.10
2014 0.05 0.10
2013 0.04 0.10
2012 0.06 0.10
2011 0.10 0.10
2010 0.07 0.10
2009 0.08
2008 0.08
2007 0.29
2006 0.24
2005 0.38
2004 0.22
2003 0.22
2002 0.31
2001 0.67
2000 0.67
1999 0.67
1998 0.67
1997 0.67
1996 0.67
1995 0.67
1994 0.67
1993 0.67
1992 0.67
1991 0.67
1990 0.67
1989 0.67
1988 0.67
1987 0.67
1986 0.67
1985 0.67
1984 0.67
1983 0.67
1982 0.67
1981 0.67
1980 0.67
1979 0.67
1978 0.67
1977 0.67
1976 0.67
1975 0.67
1974 0.67

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.