Salmon & Steelhead Recovery Tracker

Sandy (Independent Population)

Oncorhynchus kisutch

Abundance

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

Spawning Year Nat. Origin Spawners 95% Confidence Interval Abundance Goal
2016 939 312 1,225
2015 443 193 3,056
2014 5,942 2,939 5,343
2013 667 245 4,662
2012 1,165 885 4,783
2011 3,494 1,009 4,675
2010 901 511 3,001
2009 1,493 637
2008 1,277 340
2007 687 348
2006 923
2005 856 0
2004 1,213 8
2003 1,348 0
2002 382 24
2001 1,176
2000 730
1999 162
1998 261
1997 116
1996 180
1995 697
1994 601
1993 193
1992 790
1991 1,491
1990 376
1989 2,182
1988 1,507
1987 1,204
1986 1,558
1985 1,463
1984 768
1983 745
1982 722
1981 646
1980 922
1979 367
1978 407
1977 91
1976 642
1975 619
1974 548

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 Average Abundance Avg. of Ab.Goal
2016 1,566
2015 1,588
2014 1,664
2013 1,201

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.

Occupancy

The occupancy of spawning adults or juveniles at spatially balanced, random survey sites.

Spawning Year Total Sites Visited Occupied Sites Percent Occupied Delisting Goal Broadsense Goal
2016 30 13 43% 75% 85%
2015 25 6 24% 75% 85%
2014 21 12 57% 75% 85%
2013 28 9 32% 75% 85%
2012 28 14 50% 75% 85%
2011 23 10 43% 75% 85%
2010 23 9 39% 75% 85%
2009 30 16 53%
2008 29 18 62%
2007 26 12 46%
2006 12 0 0%
2005 15 3 20%
2004 21 5 24%
2003 18 3 17%
2002 4 0 0%

Evaluation Thresholds

Pass - The percentage of sites not occupied by spawning adults or rearing juvenile salmon is less than or equal to the threshold at least six times during a 12-year period and the overall average percentage of sites not occupied during that same time period is less than or equal to to threshold.

Fail- The percentage of sites not occupied by spawning adults or rearing juvenile salmon is greater than the threshold at least six times during a 12-year period and the overall average percentage of sites not occupied during that same time period is greater than the threshold.

Habitat
  • 2013
    fail

The amount of available high quality habitat for all freshwater life stages in each population. Habitat condition is evaluated using population specific winter habitat surveys in the range of coho salmon. These surveys began in 2007 with the goal of surveying each independent population or dependent population group once every 5 years. Not all populations in the Lower Columbia Coho ESU have been surveyed for habitat at this time therefore some populations will display no habitat data.

Survey Year Sites Sampled Mi. HQ Hab 95% C.I. Delisting Goal Broadsense Goal
2013 43 8.9 9.1 41.5 41.5

Evaluation Thresholds

For a population to pass this criterion, the miles of high quality habitat (i.e. capable of producing > 2,800 smolts/mile) for independent populations (excluding lakes populations) equals or exceeds the population-specific goals.

Time Period Category Comment
2013 fail Goal met 0 of 1 years

Hatchery Proportion

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

Spawning Year H proportion (whole basin) H proportion (above dam) Proportion Hatchery
2016 0.03 0.00 0.03
2015 0.05 0.00 0.04
2014 0.03 0.00 0.03
2013 0.12 0.00 0.12
2012 0.03 0.00 0.03
2011 0.08 0.00 0.08
2010 0.12 0.00 0.12
2009 0.10 0.00 0.10
2008 0.00 0.00 0.00
2007 0.09 0.00 0.09
2006
2005 0.00 0.00 0.00
2004 0.09 0.00 0.10
2003 0.00 0.00 0.00
2002 0.57 0.00 0.57
2001 0.00 0.00
2000 0.00 0.00
1999 0.00 0.00
1998 0.00 0.00
1997 0.00 0.00
1996 0.00 0.00
1995 0.00 0.00
1994 0.00 0.00
1993 0.00 0.00
1992 0.00 0.00
1991 0.00 0.00
1990 0.00 0.00
1989 0.00 0.00
1988 0.00 0.00
1987 0.00 0.00
1986 0.39 0.39
1985 0.29 0.29
1984 0.51 0.51
1983 0.00 0.00
1982 0.56 0.56
1981 0.35 0.35
1980 0.57 0.57
1979 0.00 0.00
1978 0.00 0.00
1977 0.00 0.00
1976 0.00 0.00
1975 0.00 0.00
1974 0.00 0.00

Average Hatchery Proportion

Average over a nine-year period of the percentage of the total number of natural spawners that are of hatchery origin.

Spawning Year Proportion Hatchery 9-yr. pHOS Avg. pHOS Limit
2016 0.03 0.06 0.09
2015 0.04 0.07 0.09
2014 0.03 0.07 0.09
2013 0.12 0.07 0.09
2012 0.03 0.07 0.09
2011 0.08 0.06 0.09
2010 0.12 0.12 0.09

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.