2021 Columbia River Steelhead Crisis (rev. 9-7-21) Current Summer Steelhead returning to the Columbia River above Bonneville Dam1: April 1 thru September 6 ➢ 45,938 total hatchery and wild steelhead (H + W) have passed Bonneville Dam o The pre-season estimate was 96,800 steelhead, half of which (48,400) were expected to pass Bonneville by August 20 – 2021 passage on August 20 was half of expected passage of the second lowest steelhead run since 1975. The updated run is now 42,600 total hatchery and wild steelhead. ➢ 19,058 total wild, unclipped steelhead have passed Bonneville Dam • •
The current 10-year average steelhead passage is 152,459 combined hatchery & wild steelhead The current 10-year average wild fish passage is 60,672 wild summer steelhead.
Comparing current passage with the Current Ten-year Average (CTYA) (2011-2020): ❖ The current 2021 return of combined wild and hatchery steelhead is 30.1% of the CTYA. ❖ The current 2021 return of wild (or unclipped) summer steelhead is 31.4% of the CTYA. Hatchery fish outnumber wild fish 26,880 to 19,058 (some adipose-intact fish are hatchery-origin). What we have lost: Avoid the declining baseline syndrome, compare current run with a longer data set The “best” 10-year average for H+W steelhead since 1984 was between 2001-2010 (321,618 steelhead). The “best” 10-year average for wild steelhead since 1984 was from 2001-2010 (100,722 wild steelhead) ➢ The 2021 combined run is 14.3% of the best 10-year average (321,618 H+W fish during 2001-2010) ➢ The 2021 wild run is 19% of the best 10-year average (100,722 wild fish during 2001-2010) Current Summer Steelhead returning to the Columbia River above Lower Granite Dam2: June 1 thru Sept. 6 ➢ 2,491 combined hatchery and wild steelhead have passed Lower Granite Dam ➢ 1,629 total wild steelhead have passed Lower Granite Dam The current 10-year average steelhead passage is 12,004 combined hatchery & wild steelhead. The current 10-year average unclipped/wild fish passage is 5,386 wild summer steelhead. Comparing current Steelhead passage with the Current Ten-year Average at LGD (CTYA) (2011-2020): ❖ The current 2021 return of combined wild and hatchery steelhead is 21% of the CTYA. ❖ The current 2021 return of wild (or unclipped) summer steelhead is 30.3% of the CTYA. What we have lost: Avoid the declining baseline syndrome, compare current run with a longer data set The “best” 10-year average for H+W steelhead since 1984 was between 2001-2010 (22,317 steelhead). The “best” 10-year average for wild steelhead since 1984 was from 2001-2010 (7,853 wild steelhead) ➢ The 2021 combined run is 11.2% of the best 10-year average (22,317 H+W fish during 2001-2010) ➢ The 2021 wild run is 21% of the best 10-year average (7,853 wild fish during 2001-2010)
1
Numeric Data is from the UW Columbia River DART website: http://www.cbr.washington.edu/dart/query/adult_graph_text
2
Numeric Data is from the UW Columbia River DART website: http://www.cbr.washington.edu/dart/query/adult_graph_text