Westslope Cutthroat Trout
A native trout of the inland Northwest, originally the most widespread cutthroat subspecies in North America and the only one whose historic range crossed the Pacific, Arctic, and Atlantic drainages.
Today genetically pure populations cling to less than 3% of that historic water — mostly cold headwater creeks above barriers that keep introduced rainbows out. For dry-fly anglers willing to walk, they're a wild-country favorite.
Also known as Missouri River Cutthroat Trout, Blackspotted Cutthroat Trout, Cutthroat, Cutty
- Olive-bronze to silvery green back fading to greenish-gold sides, with red flushing on the gill covers and flanks; spawning fish can turn fiery red overall.
- Small dark spots clustered heavily on the back half of the body and tail, with almost none below the lateral line up front and virtually none near the pectoral fin — the key tell apart from rainbows and other cutthroat subspecies.
- Red, pink, or orange slash under each side of the lower jaw, plus basibranchial teeth under the tongue (rainbows lack these); presence of those teeth in a 'rainbow' usually means hybridization.
- Stream fish typically run 6–12 inches; lake-access (adfluvial) fish in larger systems reach 8–16 inches and rarely top 18, with a 24-inch Idaho lake fish standing as a notable outlier.
What to know
Habitat Distribution
- Native across the upper Columbia basin in Idaho and Montana, the Methow and Lake Chelan drainages in Washington, the John Day in Oregon, and the upper Missouri and South Saskatchewan headwaters — a range that uniquely spans three ocean drainages.
- A cold, clean-water obligate; rainbow trout tolerate water roughly 8°F warmer, which is why pure WCT have been pushed up into headwater refuges above natural or man-made barriers.
- Three life-history forms can share a basin: stream-resident fish that never leave their natal creek, fluvial fish that run rivers and migrate to spawn, and adfluvial fish that live in lakes and ascend tributaries.
- Highly sensitive to fine sediment in spawning gravels and dependent on intact riparian cover for shade and the terrestrial bug subsidy that gets them through warm late-summer flows.
Specific Spots
- Pool-rich water beats uniform riffle reaches — pool frequency, depth, and woody cover are the variables that most consistently hold fish.
- In spring and early summer, riffles, runs, and pool heads concentrate insect drift and pull fish into feeding lanes; pocket water around boulders is reliable.
- Late summer flips the script to bank-oriented feeding: undercuts, overhanging grass, and shaded cutbanks where ants, beetles, and hoppers fall in.
- In hot mid-summer or in winter, fish drop into the deepest available pools — slow water with boulders or large wood — and overwinter there or in spring-fed tributaries with steady temperature.
Westslope Cutthroat Trout FAQ
Answers from onWater's species guide.
What are the best lures and bait for Westslope Cutthroat Trout?
Small inline spinners (Panther Martin, Mepps, Blue Fox) in 1/16 to 1/8 oz are the do-everything lure across creeks, rivers, and lakes. Small wobbling spoons cover lake fish well, especially trolled behind cowbell or Davis-rig flashers when adfluvial fish are deeper.
What flies work for Westslope Cutthroat Trout?
Dry flies are the heart of WCT fishing: Elk Hair Caddis, Stimulators (great during stonefly activity), Royal Wulffs, Parachute Adams, PMD patterns, and foam ants and beetles. Attractors work because these fish aren't usually picky.
What do Westslope Cutthroat Trout eat?
Caddis, stoneflies, mayflies, and midges in every stage make up the core diet, exactly what Elk Hair Caddis, Stimulators, Parachute Adams, PMD patterns, Pheasant Tails, and Hare's Ears imitate. Nymph or dry, you're matching this short list.
Where do Westslope Cutthroat Trout live?
Native across the upper Columbia basin in Idaho and Montana, the Methow and Lake Chelan drainages in Washington, the John Day in Oregon, and the upper Missouri and South Saskatchewan headwaters, a range that uniquely spans three ocean drainages.
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