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Steelhead trout (Oncorhynchus mykiss) are among the most iconic fish of Washington’s rivers. Sleek and silvery, these remarkable salmonids are born in freshwater streams, migrate to the ocean to grow, and return years later to their natal rivers to spawn. Unlike most Pacific salmon, steelhead can survive spawning and return to the ocean to repeat the cycle (National Marine Fisheries Service, 2026).

“The charm of the trout is that he is the only fish that fights for his life in our streams; he leaps, he struggles, he lives.”

–Thoreau (1817–1862)

Description

Steelhead are the migratory, or anadromous, form of rainbow trout (Oncorhynchus mykiss). “Anadromous” means they hatch in freshwater streams, migrate to the ocean to grow and mature, and then return to freshwater rivers to spawn. Rainbow trout that remain in freshwater their entire lives are the same species; the difference lies in whether the fish migrates to the ocean (Behnke, 2002).

Steelhead coloration and spotting vary with life stage and environment. Ocean-going fish are typically silvery, while freshwater residents or spawning individuals may develop darker or reddish tones (Behnke, 2002).

Sexual dimorphism is subtle but noticeable: males often develop hooked jaws (“kypes”) and brighter colors during spawning, whereas females are generally more streamlined and silvery. Despite differences in life stage or migration pattern, all individuals remain Oncorhynchus mykiss (Behnke, 2002).

Distinguishing Features

Steelhead are recognized for their streamlined shape, silvery sides, and spots along their back and fins. Historical illustrations show natural variation in color and spotting: some depict greenish hues, others silvery-pink; some show dense spotting, others more delicate patterns (Cobb, 1917; Denton, 1896; Evermann & Goldsborough, 1907; National Park Service, n.d.; New York State Commissioners of Fisheries, Game and Forests, 1898). These differences reflect both artistic interpretation and natural diversity, influenced by habitat, life stage, or spawning condition.

Feature	Rainbow Trout (Oncorhynchus mykiss)	Steelhead Trout (Oncorhynchus mykiss, anadromous)
Adult Length	12–30 in (30–75 cm)	20–40 in (50–100 cm), can reach 45+ in (115+ cm)
Adult Weight	2–8 lbs (0.9–3.6 kg)	8–20 lbs (3.6–9 kg), can reach 30+ lbs (13+ kg)
Color	Olive to bluish-green back, silvery sides, pink lateral stripe	Silvery body with blue-green back while in ocean; may develop reddish or darker tones when spawning in freshwater
Stripes / Spots	Pink lateral stripe; scattered black spots on back, dorsal fin, and tail	Similar lateral stripe; often more pronounced black spots along back, dorsal fin, and tail; color varies with life stage
Eye Color	Golden to amber with dark pupil	Golden to amber with dark pupil; slightly darker during spawning
Mouth Shape	Terminal, slightly pointed; jaw straight	Terminal, slightly more robust; males may develop hooked jaw (“kype”) during spawning
Life History / Behavior	Lives entirely in freshwater	Anadromous: migrates to ocean to grow, returns to freshwater to spawn

Why They Matter

Steelhead aren’t just pretty fish—they’re vital players in our rivers. When they spawn, they bring nutrients from the ocean back into freshwater streams, feeding insects, plants, and other animals. Young steelhead are an important food source for birds, mammals, and larger fish.

They can also provide clues about river health. Steelhead depend on connected, cold, clean waterways for spawning, rearing, and migration, so population declines can signal problems with habitat, water quality, fish passage, or other parts of the river system.

Steelhead also hold deep cultural meaning. For many Indigenous peoples and Tribal Nations in Washington, these fish are connected to traditional foods, cultural practices, ceremonies, and stewardship of rivers. The Yakama Nation, Muckleshoot Tribe, and Swinomish Indian Tribal Community, among others, have long-standing relationships with fish and aquatic resources (Muckleshoot, n.d.; Swinomish, n.d.; Yakama Nation Fisheries, n.d.).

Healthy steelhead populations mean healthy rivers, thriving wildlife, and communities that stay connected to the natural world.

Status

Washington has five federally listed steelhead Distinct Population Segments (DPSs): Snake River Basin, Upper Columbia River, Middle Columbia River, Lower Columbia River, and Puget Sound. All five are federally listed as Threatened under the Endangered Species Act. WDFW currently classifies these five DPSs as State Candidates for listing in Washington (WDFW, 2024; National Marine Fisheries Service, 2026).

At the species level, Oncorhynchus mykiss is considered Least Concern globally by the IUCN. This broader status does not reflect the serious conservation concerns facing individual steelhead populations in Washington and elsewhere (IUCN, 2020).

***** Status References: WA State: WDFW North America: NatureServe Global: IUCN Red List *****

Indigenous Significance

Steelhead trout hold cultural and spiritual significance for many Indigenous tribes in Washington. These fish and other native anadromous fish are connected to traditional foods, cultural practices, ceremonies, and stewardship of rivers and watersheds.

The Yakama Nation, for example, maintains extensive programs to protect and restore culturally important fish populations and their habitats. Its work includes steelhead conservation and habitat restoration projects such as the Sunnyslope Side Channel Project on the Wenatchee River (Yakama Nation Fisheries, n.d.).

For Tribal Nations, protecting fish is inseparable from protecting the rivers and landscapes that sustain them. Steelhead recovery therefore involves not only biological conservation but also cultural continuity and responsibility to future generations.

Conservation

Steelhead populations face threats from habitat loss, dams and other barriers to migration, water withdrawals, degraded water quality, hatchery interactions, and changing ocean and climate conditions. Washington and its partners are working on recovery through:

• Habitat restoration: improving stream flows, restoring riparian vegetation, reconnecting floodplains, and improving spawning and rearing habitat.
• Fish passage improvements: removing or modifying barriers such as culverts and dams so steelhead can reach spawning and rearing habitat.
• Population monitoring: tracking steelhead populations within each DPS to assess trends and recovery.
• Hatchery reform: reducing potential genetic and ecological impacts on wild populations.

These efforts complement federal protections under the Endangered Species Act. Tribes, local organizations, agencies, and volunteers also support stream restoration, habitat monitoring, and education (WDFW, 2024; National Marine Fisheries Service, 2026).

How You Can Help

You don’t need to live on a river to make a difference for steelhead. Here are practical, backyard-friendly actions anyone can take:

• Plant native vegetation along waterways – Even small riparian plantings stabilize banks, shade streams, and reduce runoff.
• Reduce chemical runoff – Limit fertilizers, herbicides, and pesticides. Rain can wash these into streams, affecting fish and aquatic insects.
• Prevent erosion – Use mulch, groundcovers, or rain gardens to prevent soil runoff into nearby streams.
• Conserve water – Reduce irrigation and household water use to help maintain healthy stream flows.
• Volunteer locally – Join stream restoration, adopt-a-stream, or watershed monitoring programs.
• Educate and advocate – Share information with neighbors, participate in community forums, and support river-friendly policies.

Even small actions in backyards, gardens, and neighborhoods can improve water quality, habitat connectivity, and ecosystem health—critical for steelhead survival.

Nature Art

These historic illustrations reveal just how changeable steelhead and rainbow trout can be—shifting colors, spots, and shapes make them surprisingly tricky to tell apart. Denton’s 1896 trout (Salmo irideus, now recognized as Oncorhynchus mykiss) glows silvery-pink, Evermann and Goldsborough’s 1907 steelhead leans green, and Cobb’s 1917 fish, in black and white, highlights form over color.

In Smith’s 2026 watercolor, the two adult phases sit side by side: the upper fish bursts with the deep, vibrant hues of a spawning steelhead, while the lower gleams bright silver, capturing the ocean-run adult—two lives, one species, dramatically transformed.

Cover photo credit: Rainbow trout (Oncorhynchus mykiss) illustration (Knepp, n.d.)

References

Behnke, R. J. (2002). Trout and salmon of North America. The Free Press.

IUCN. (2020). Oncorhynchus mykiss. The IUCN Red List of Threatened Species. Retrieved October 5, 2026, from https://www.iucnredlist.org/

Muckleshoot. (n.d.). History. Retrieved October 5, 2026, from https://www.muckleshoot.nsn.us/history

National Marine Fisheries Service. (2026, September 24). Steelhead. NOAA Fisheries. Retrieved October 5, 2026, from https://www.fisheries.noaa.gov/species/steelhead

Swinomish. (n.d.). Environmental policy. Retrieved October 5, 2026, from https://www.swinomish-nsn.gov/natural-resources/page/environmental-policy

WDFW. (2024). Washington state listed and candidate species. Washington Department of Fish & Wildlife. Retrieved October 5, 2026, from https://wdfw.wa.gov/sites/default/files/2024-03/wa-state-listed-and-candidate-species-list.pdf

Yakama Nation Fisheries. (n.d.). Sunnyslope Side Channel project. Retrieved October 5, 2026, from https://yakamafish-nsn.gov/restore/projects/targeted-population/steelhead

Image Credits

Cobb, J. N. (1917). Steelhead trout (Oncorhynchus mykiss; historically referred to as Salmo gairdneri) [Illustration]. In Pacific salmon fisheries. Annual report of the Commissioner of Fisheries to the Secretary of Commerce, 1915–1916. Government Printing Office. Wikimedia Commons. Public domain. Retrieved October 5, 2026, from https://commons.wikimedia.org/wiki/File:FMIB_34518_Steelhead_Trout.jpeg

Denton, S. F. (1896). Rainbow trout (Salmo irideus; now recognized as Oncorhynchus mykiss) [Illustration]. In First annual report of the Commissioners of Fisheries, Game and Forests of the State of New York, 1895. Wynkoop Hallenbeck Crawford Co., Printers. Freshwater and Marine Image Bank, University of Washington. Wikimedia Commons. Public domain. Retrieved October 5, 2026, from https://commons.wikimedia.org/wiki/File:FMIB_43023_Rainbow_Trout_%28Salmo_irideus%29.jpeg

Evermann, B. W., & Goldsborough, E. L. (1907). Steelhead (Oncorhynchus mykiss; historically referred to as Salmo gairdneri) [Illustration]. In The fishes of Alaska. Department of Commerce and Labor, Bureau of Fisheries. Wikimedia Commons. Public domain. Retrieved October 5, 2026, from https://commons.wikimedia.org/wiki/File:Steelhead_Oncorhynchus_mykiss.jpg

Knepp, T. (n.d.). Rainbow trout (Oncorhynchus mykiss) [Illustration]. U.S. Fish and Wildlife Service. Wikimedia Commons. Public domain. Retrieved 10/26/2026 from https://commons.wikimedia.org/wiki/File:Rainbow_trout_FWS_1.jpg

National Park Service. (n.d.). Rainbow trout/steelhead [Illustration]. PICRYL. Public domain. Retrieved October 5, 2026, from https://picryl.com/media/rainbow-troutsteelhead-c73447

New York State Commissioners of Fisheries, Game and Forests. (1898). Steelhead or salmon trout (Salmo gairdneri Richardson; now recognized as Oncorhynchus mykiss) [Illustration]. In Third annual report of the Commissioners of Fisheries, Game and Forests of the State of New York, 1897. Wynkoop Hallenbeck Crawford Co., Printers. Wikimedia Commons. Public domain. Retrieved October 5, 2026, from https://commons.wikimedia.org/wiki/File:FMIB_43127_Steelhead_or_Salmon_Trout_%28Salmo_gairdneri_Richardson%29.jpeg

Oregon State University. (2016, February 12). Steelhead trout drifting in an Oregon stream [Photograph]. Wikimedia Commons. Public domain. Retrieved October 5, 2026, from https://commons.wikimedia.org/wiki/File:Steelhead_%2824354769644%29.jpg

Smith, I. (2026). Steelhead [Illustration]. Uploaded with permission..