Steelhead and salmon distinct population segments

The National Oceanic and Atmospheric Administration, in cooperation with the U.S. Fish and Wildlife Service and Environmental Protection Agency, groups steelhead and salmon into distinct population segments (DPS). There are currently 15 DPS for steelhead (Oncorhynchus mykiss) and 31 evolutionarily significant units (ESU) for five species of Pacific salmon Oncorhynchus. The boundaries of these areas are used to determine whether specific populations of a species should be designated threatened or endangered species under the Endangered Species Act.

Endangered and Threatened Species DPS and ESU U.S. range for Steelhead and Salmon

Steelhead distinct population segment

Steelhead Oncorhynchus mykiss
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Southern California DPS	Endangered (1997), (2006)[2]	Endangered (2011)
South-Central California Coast DPS	Endangered (1997), Threatened (2006)[3]	Threatened (2011)
California Central Valley DPS	Threatened (1998), (2006)[4]	Threatened (2011)
Central California Coast DPS	Threatened (1998), (2006)[5]	Threatened (2011)
Northern California DPS	Threatened (1998), (2006)[5]	Threatened (2011)
Klamath Mountains Province DPS
Lower Columbia River DPS	Threatened (1998), (2006)[6]	Threatened (2011)
Middle Columbia River DPS	Threatened (1999), (2006)[7]	Threatened (2011)
Oregon Coast DPS
Puget Sound DPS	Threatened (1997)[8]	Threatened (2011)
Olympic Peninsula DPS
Snake River Basin DPS	Threatened (1997), (2006) [9]	Threatened (2011)
Southwest Washington DPS
Upper Columbia River DPS	Endangered (1997), Threatened (2006), Endangered (2007), Threatened (2009)[10]	Threatened (2011)
Upper Willamette River DPS	Threatened (1999), (2006)[11]	Threatened (2011)

Pacific salmon evolutionarily significant unit

Chinook salmon Oncorhynchus tshawytscha
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Central Valley Spring-run ESU	Threatened (1995), (2005)[12]	Threatened (2011)
Central Valley Fall-run and Late Fall-run ESU
California Coast ESU	Threatened (1999), (2005) including hatchery stocks[13]	Threatened (2011)
Oregon Coast ESU
Mid-Columbia River Spring-run ESU
Lower Columbia River ESU	Threatened (1999), (2005)[6]	Threatened (2011)
Deschutes River Summer/Fall-run ESU
Southern Oregon & Northern California Coastal ESU
Snake River Spring/Summer-run ESU	Threatened (1992), (2005)[9]	Threatened (2011)
Snake River Fall-run ESU	Threatened (1992), (2005)[9]	Threatened (2011)
Sacramento River Winter-run ESU	Threatened (1989), (1990), Endangered (1992), Threatened (2004), Endangered (2005)[14]	Endangered (2011)
Puget Sound ESU	Threatened (1995), (2005)[8]	Threatened (2001)
Washington Coast ESU
Upper Willamette River ESU	Threatened (1999), (2005)[11]	Threatened (2011)
Upper Klamath-Trinity Rivers ESU
Upper Columbia River Summer/Fall-run ESU
Upper Columbia River Spring-run ESU	Endangered (1999), (2005)[10]	Endangered (2011)
Coho salmon Oncorhynchus kisutch
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Central California Coast ESU	Endangered (1996), (2005) including hatchery stocks[13]	Endangered (2011)
Lower Columbia River ESU	Threatened (2005)[6]	Threatened (2011)
Olympic Peninsula ESU
Oregon Coast ESU
Puget Sound/Strait of Georgia ESU
Southern Oregon/Northern California ESU	Threatened (1997), (2005)[15]	Threatened (2011)
Southwest Washington ESU
Sockeye salmon Oncorhynchus nerka
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Baker River ESU
Lake Pleasant ESU
Lake Wenatchee ESU
Okanogan River ESU
Ozette Lake ESU	Threatened (1999), (2005)[16]	Threatened (2011)
Quniault Lake ESU
Snake River ESU	Endangered (1991), (2005)[9]	Endangered (2011)
Chum salmon Oncorhynchus keta
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Columbia River ESU	Threatened (1999), (2005)[6]	Threatened (2011)
Hood Canal Summer-run ESU	Threatened (1995), (2005)[8]	Threatened (2001)
Pacific Coast ESU
Puget Sound/Strait of Georgia ESU
Pink salmon Oncorhynchus gorbuscha
DPS/ESU Name	Initial/Revised status	Current status	Boundary Map[1]
Even-year ESU
Odd-year ESU