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Legendary Species · Idaho

Steelhead in Idaho

Oncorhynchus mykiss[1]

12 Idaho waters whose agency species list names steelhead. Each links to its water page (gauge, regulations, access map, guides and shops) and to the agency list it comes from.

  • 12waters list it
  • 0destination hubs
Two anglers in rain gear standing in a boat on a grey river, one holding a long rod
Winter steelhead fishing on the Skagit River, Washington (Doug Wilson, U.S. National Archives and Records Administration). Photo: Doug Wilson, public domain, via Wikimedia Commons

Idaho waters

Most fished first. A species missing from an agency list does not mean it is absent; this page lists only waters whose list names it (at least 5 are needed for a page).

All Idaho watersSteelhead: every state

Identification

  • Adult steelhead back from one to three years at sea are usually heavily marked with irregular dark spots, both above and below the lateral line.[2]
    What the source says
    “Adult steelhead which have spent 1 to 3 years in the ocean are generally heavily spotted with irregularly shaped dark spots both above and below the lateral line.”
  • Fresh from the ocean, steelhead can look much brighter and more silver than resident rainbow trout.[2]
    What the source says
    “Steelhead fresh from the ocean can be very bright and much more silver in color than resident rainbow.”
  • Washington describes steelhead as having dark spots over the whole fish, tail included, with slight to strong rainbow colouring.[3]
    What the source says
    “Steelhead also have dark spots scattered over the entire fish, including the tail, with slight to pronounced rainbow coloring.”

More on identifying steelhead

Status, protections and rules

As each agency stated them on the date read; a rule applies only where its agency says so. Check the current regulations for the water before you fish.

  • Under the US Endangered Species Act, NOAA Fisheries lists one steelhead DPS as endangered and 10 DPSs plus one experimental population as threatened.[1]
    What the source says
    “Under the Endangered Species Act, one distinct population segment (DPS) is listed as endangered, while 10 DPSs and one experimental non-essential population are listed as threatened.”
  • NOAA's threatened steelhead units are California Central Valley, Central California Coast, Lower Columbia River, Middle Columbia River, Northern California, Puget Sound, Snake River Basin, South-Central California Coast, Upper Columbia River and Upper Willamette River; Southern California is endangered.[1]
    What the source says
    “ESA Endangered Southern California DPS ESA Threatened California Central Valley DPS Central California Coast DPS Lower Columbia River DPS Middle Columbia River Northern California DPS Puget Sound DPS Snake River Basin DPS South-Central California Coast DPS Upper Columbia River DPS Upper Willamette River DPS”
  • Oregon's March 2024 notice for the Santiam River said anglers cannot keep wild winter steelhead but may keep hatchery steelhead, which have the adipose fin removed; wild fish have it intact. Rules vary by river and year, so check current regulations.[4]
    What the source says
    “While anglers cannot keep wild winter steelhead, they can still fish for and retain hatchery steelhead or hatchery spring Chinook. The peak run timing for these fish in the Santiam basin is usually in May and June, though some early fish do arrive in April. Hatchery summer steelhead have their adipose fin removed while wild steelhead have theirs intact.”

Water temperature in Idaho

  • Under 66°FIn the study Idaho Fish and Game cites, trout landed in water under 66°F survived best: mortality “was 69% higher for trout landed at 73°F water temperatures than for those landed when waters were less than 66°F.” In summer, “early-mornings are typically best while the water is still cool.”
  • WarmingIdaho Fish and Game cites a study in which mortality “was 69% higher for trout landed at 73°F water temperatures than for those landed when waters were less than 66°F.” Fish early: “early-mornings are typically best while the water is still cool.”
  • 73°FIdaho Fish and Game: “On those occasions where trout streams do get above 73°F, anglers may want to pause fishing because catch rates are noticeably lower.” Idaho sets no temperature closure: “Idaho Fish and Game is hesitant to close fishing in wild trout waters based on warm water temperatures.”

Sources: Perspective: Trout fishing during low water and high temperatures (25 July 2024; archived copy) (Idaho Department of Fish and Game); The heat is on, but trout and other coldwater fish have been around the block a time or two (9 Aug 2022; archived copy) (Idaho Department of Fish and Game).

Hatch & season charts

Sources

Every fact on this page is our paraphrase of the page cited beside it, read on the date shown. Rules and seasons change: check the agency's current regulations before you fish.

  1. Steelhead | NOAA Fisheries NOAA Fisheries, read Oct 24, 2026.
  2. Steelhead / Rainbow Trout Species Profile, Alaska Department of Fish and Game Alaska Department of Fish and Game, read Oct 24, 2026.
  3. Rainbow trout | Washington Department of Fish & Wildlife Washington Department of Fish and Wildlife, read Oct 24, 2026.
  4. Santiam River anglers reminded of regulations to protect threatened winter steelhead (ODFW news, March 7, 2024) Oregon Department of Fish and Wildlife, read Oct 24, 2026.