Salmon Snapshots

Trinity River

2015/16 Population

Estimate of naturally spawning fish


Oncorhynchus kisutch


Oncorhynchus tshawytscha


Oncorhynchus mykiss

  What We Have Natural Born: Hatchery Born:     Natural Born: Hatchery Born:
  9,629 917 8,712
Fall Run 30,890 18,202 12,688 Spring Run 2,328
  7,513 5,691 1,822
  What We Need Natural Born:     Natural Born:
Fall Run   62,000 Spring Run   6,000

Population estimate for natural area spawners (derived from mark/recapture methods) represents both naturally born and hatchery born adult fish and jacks (age 2 fish) which return to spawn naturally in the river. Data provided by California Department of Fish and Wildlife. Data are preliminary and subject to change. The Klamath/Trinity Program document library provides the Trinity River Project and Klamath River Project annual reports, weir counts, hatchery returns, which present all the detailed data, methodologies, and assumptions.

Coho salmon in the Trinity watershed — including the sub-watersheds of the Upper Trinity, Lower Trinity and South Fork Trinity — are state and federally listed as threatened. Spawning adult fish recovery targets represents the biological conditions National Marine Fisheries Service would use to delist the species and remove them from the Federal List of Endangered and Threatened Wildlife and Plants (50 CFR 223.102)(NMFS 2014). Total spawning target for Upper Trinity River (5,700), Lower Trinity River (3,600), and South Fork Trinity River (970) populations.

Chinook salmon and steelhead in the Trinity basin are not currently listed as endangered or threatened, so there are no recovery targets. The Trinity River Restoration Program Integrated Assessment Plan does have management objectives for naturally born adult only fish that return to spawn in the Trinity River and its tributaries (TRRP, 2009). The coho management objective for naturally born adult only coho is 1,400. For 2014/15, naturally born adult only estimates are 823 coho, 11,528 fall Chinook, X spring Chinook, and 5,691 steelhead.

The 2015/16 snapshot is defined as fall 2015 to spring 2016, as per when salmon and steelhead return from the ocean to spawn. Fall Chinook spawning season is fall 2015. Coho season is fall through early January 2016. Steelhead season can start in fall 2015 but is primarily winter and spring 2016. Spring Chinook return in spring 2015 and spawn in the fall 2015.


National Marine Fisheries Service. 2014. Final Recovery Plan for the Southern Oregon Northern California Coast Evolutionarily Significant Unit of Coho Salmon (Oncorhynchus kisutch). September 2014.

National Marine Fisheries Service. 2016. Final Coastal Multispecies Recovery Plan. National Marine Fisheries Service, West Coast Region, Santa Rosa, California.


fish images © Joe Tomelleri