What Is a Steelhead? How Washington and New York Stock Sea-Run Rainbow Trout
Washington has stocked over 224 million steelhead across 388 waters. Here's what a steelhead actually is, and how Washington's ocean-run program compares to New York's Great Lakes program.
A steelhead isn't a separate species — it's a rainbow trout that migrates to open water and comes back bigger. Washington has recorded over 224 million steelhead stocked across 388 waters, the largest steelhead program in this dataset; New York stocks a smaller, biologically different version that runs to the Great Lakes instead of the ocean.
Key takeaways
- Steelhead are Oncorhynchus mykiss — the exact same species as rainbow trout — just a migratory life-history form, not a separate species.
- Washington has recorded 8,330 steelhead stocking events across 388 waters, totaling over 224 million fish.
- New York has recorded 574 steelhead events across 35 waters, totaling nearly 12.8 million fish — a Great Lakes program, not an ocean-run one.
- Montana and Utah are landlocked and record no steelhead stocking at all; California's records don't break trout out by species, so this dataset can't confirm steelhead there specifically.
What makes a trout a "steelhead"?
Steelhead and rainbow trout are genetically the same species, Oncorhynchus mykiss. The difference is life history, not biology: a "resident" rainbow trout spends its whole life in the same river or lake, while a steelhead migrates out to open water, grows much larger on a richer food supply, and returns to fresh water to spawn — like a salmon, but the fish can survive spawning and repeat the migration in later years, which most Pacific salmon cannot.
For general rainbow trout biology and stocking, see our guide to rainbow, brown, and brook trout stocking and the steelhead species profile.
Washington's steelhead program: numbers and scale
Washington's Department of Fish and Wildlife has recorded 8,330 steelhead stocking events across 388 waters, totaling over 224 million fish — more distinct waters than any other single species in Washington's dataset. Steelhead are stocked as smolts into coastal and Puget Sound tributaries that connect to the Pacific, supporting both a major sport fishery and hatchery supplementation for wild steelhead runs, several of which are federally protected.
Full state-level detail is on the Washington steelhead stocking records page.
New York's steelhead: Great Lakes, not ocean
New York has recorded 574 steelhead events across 35 waters, totaling nearly 12.8 million fish — a program built entirely around Lake Ontario and its tributaries, not the Atlantic Ocean. Great Lakes steelhead follow the same migratory pattern as their ocean-run cousins — they just treat the lake as their "ocean," growing large in open water before returning up rivers like the Salmon River to spawn.
See the New York steelhead stocking records for the full water-by-water breakdown.
Where steelhead aren't stocked
Montana and Utah are both landlocked, with no route to the ocean or the Great Lakes, so neither state records any steelhead stocking — their rainbow trout stay resident by necessity. California's stocking records in this dataset log trout as "Trout (unspecified)" rather than broken out by species, so while California does stock rainbow trout broadly, this dataset can't confirm whether any of it is managed as a distinct steelhead program.
Steelhead vs. stocked rainbow trout: what changes for anglers
A stocked "catchable" rainbow trout is typically 8–11 inches and caught within days or weeks of release. A steelhead is stocked much smaller (as a smolt), spends one to three years growing in open water, and returns as a fish that can run well past 20 inches — which is why steelhead fishing is a completely different pursuit from fishing a freshly stocked put-and-take pond, even though the fish started life the same way.
Frequently asked
Is a steelhead a different species from a rainbow trout?
No. Steelhead and rainbow trout are the same species, Oncorhynchus mykiss. Steelhead are simply the migratory life-history form — they move to open water (ocean or Great Lakes) to grow before returning to fresh water to spawn, while resident rainbow trout stay in one river or lake their whole lives.
How many steelhead does Washington stock?
Washington's recorded stocking data shows 8,330 steelhead events across 388 waters, totaling over 224 million fish — the largest steelhead program tracked in this dataset.
Do New York's steelhead go to the ocean?
No. New York's steelhead run to Lake Ontario, not the Atlantic Ocean. They follow the same big-water migratory pattern as ocean-run steelhead, just using the Great Lakes as their open-water phase instead of the sea.
Why don't Montana or Utah stock steelhead?
Both states are landlocked, with no river connection to an ocean or the Great Lakes. Without a migratory route to open water, there's no way to run a true steelhead program — their rainbow trout stocking stays entirely resident.
Does California stock steelhead?
California's stocking records in this dataset log trout as "Trout (unspecified)" rather than by individual species, so this dataset alone can't confirm whether steelhead are stocked there as a distinct program.