Salmon & Steelhead Recovery Tracker

Clackamas (Independent Population)

Oncorhynchus mykiss

Abundance

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

Spawning Year Nat. Origin Spawners 95% Confidence Interval Abundance Goal
2017 2,531
2016 4,144 6,556
2015 3,740 865 6,260
2014 3,404 917 3,977
2013 2,427 509 1,338
2012 2,733
2011 1,242
2010 2,175
2009 622
2008 472
2007 1,208 174
2006 1,164 279
2005 913
2004 2,083
2003 1,198
2002 2,324
2001 1,489
2000 745
1999 295
1998 473
1997 483
1996 267
1995 1,514
1994 1,940
1993 1,916
1992 2,372
1991 768
1990 1,519
1989 1,535
1988 2,824
1987 1,814
1986 1,903
1985 1,636
1984 1,572
1983 1,642
1982 1,836
1981 2,866
1980 2,698
1979 1,515
1978 1,700
1977 1,842
1976 1,633
1975 2,281
1974 1,021

Analysis

A population with a non-negative growth rate and an average abundance approximately equivalent to estimated historical average abundance should be considered to be in the highest persistence category. The estimate of historical abundance should be credible, the estimate of current abundance should be averaged over several generations, and the growth rate should be estimated with an adequate level of statistical confidence.

Evaluation Thresholds

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 Abundance Goal Average Abundance Avg. of Ab.Goal
2017 2,155
2016 6,556 2,020
2015 6,260 1,849
2014 3,977 1,637
2013 1,338 1,547

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
2017 0.01
2016 0.08
2015 0.07
2014 0.00
2013 0.10
2012 0.02
2011
2010
2009
2008
2007 0.17
2006 0.34
2005
2004
2003
2002 0.30
2001 0.27
2000 0.15
1999 0.24
1998 0.45
1997 0.46
1996 0.29
1995 0.20
1994 0.06
1993 0.14
1992 0.31
1991 0.42
1990 0.36
1989 0.23
1988 0.16
1987 0.14
1986 0.17
1985 0.16
1984 0.20
1983 0.06
1982 0.20
1981 0.33
1980 0.18
1979 0.37
1978 0.46
1977 0.24
1976 0.13
1975 0.06
1974 0.04

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 9-yr. pHOS Avg. pHOS Limit

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.