The Steelhead Ethics Code
Steelhead with an intact adipose fin must be released, including unclipped hatchery fish. A clipped fin alone does not authorize harvest: the water must have an open harvest season and your catch must meet current limits. Keep fish in the water as much as possible, avoid the gills, and release promptly. Check IDFG steelhead rules and updates before fishing.
Understanding the Run
Generally smaller, earlier-returning fish, often after one ocean year. Common in Snake and Salmon drainages; individual fish vary.
Generally larger fish, often after two ocean years. Most return to the Clearwater, with some in Salmon tributaries.
Fish that winter in deep holes and move to spawning grounds as water warms (Feb-Apr).
Tactical Approaches
Using two-handed rods and sink tips to swing large flies across current. Low success, high reward.
Highly effective for covering deep winter holes using beads or yarn flies.
A boat-based method drifting natural or artificial bait alongside the boat's speed.
The Idaho Big Three
Regarded as the premier steelhead river in the world for large B-run fish.
The 'River of No Return' offers hundreds of miles of accessible steelhead water.
Excellent bank access near Riggins for those without boats.
Pursuing the Ghost of the Clearwater: A Masterclass in Idaho Steelhead
"Steelhead fishing in Idaho isn't just about catching a fish; it's about endurance. It's the icy spray of the Salmon River in February, the rhythmic swing of a Spey rod on the Clearwater, and the sudden, heart-stopping violence of a 15-pound buck smashing your fly in a tail-out."
The Journey to Idaho: Nature's Elite Athletes
Steelhead migrate between freshwater and the ocean, returning to Idaho to spawn. Migration distance and ocean residence vary by population and individual; not every fish travels the same 900-mile route. IDFG’s steelhead life-history overview explains their juvenile, ocean, and spawning stages.
The sheer distance of this migration means that Idaho steelhead are "summer-run" fish, regardless of when they are actually caught. They enter the Columbia River system in the heat of the summer and slowly work their way inland, reaching regional hubs like Lewiston and Riggins as the autumn temperatures begin to dip. By the time they arrive in the Clearwater or Salmon, they represent the pinnacle of freshwater game fishing.
B-Run vs. A-Run: Decoding the Idaho Giants
A-run and B-run are useful descriptions of size and migration patterns, not two rules that every fish follows. A-run fish often spend one year at sea; B-run fish commonly spend two and return larger. B-run fish are associated mainly with the Clearwater but also occur in Salmon River tributaries. IDFG explains the variation in its A-run and B-run guide.
Tactical Selection: The Evolution of the Swing
Successful steelhead angling in Idaho depends heavily on the season. During the early fall (September-October), water temperatures are still relatively warm (above 45°F), and fish are active. This is the peak window for the "swing." Using two-handed Spey rods, anglers cast across and slightly downstream, allowing the fly to pulse through the current. This method relies on the steelhead's predatory instinct to strike a moving target.
As water temperatures drop into the 30s during November and December, the steelhead's metabolism slows dramatically. They move from the active tail-outs into the deepest, slowest "winter holes" to conserve energy. During this phase, vertical presentations become essential. Nymphing with an indicator or boat-based side-drifting allows the angler to place a fly or bait right in front of the fish's nose. In sub-zero temperatures, the "bite" might be nothing more than a split-second pause in the indicator, requiring an almost supernatural level of focus.
Essential Gear: Don't Bring a Knife to a Gunfight
You cannot cut corners with steelhead gear. The combination of powerful fish and brutal environmental conditions will find the weak point in any setup. For fly anglers, an 8-weight single-hand or a 7-weight Spey rod is the baseline. Reels must have high-quality, cold-weather disc drags that won't freeze up when a fish takes a 50-yard run in 20-degree weather.
Wading safety is equally important. The Clearwater and Salmon rivers are massive, powerful bodies of water with slippery basalt or granite bottoms. Studded boots and a high-quality wading belt are literally life-saving pieces of equipment. We also recommend layering with high-tech synthetics and wool—cotton is a liability in Idaho's winter steelheading environments.
Regional Hotspots: Where the Magic Happens
The Clearwater River is the undisputed king of Idaho's steelhead waters. The section from Lewiston up to Kooskia offers hundreds of named holes and drifts. The Salmon River, specifically the section near Riggins, provides a more rugged, canyon-fishing experience. Here, you'll find the "Little Salmon" as well, which offers excellent bank access for those without a drift boat. Finally, The Snake River below Hells Canyon Dam provides a remote, wilderness experience where A-run and B-run fish converge, often giving anglers the opportunity to catch both in the same day.
The Future of the Run: Ethics and Survival
Release any steelhead with an intact adipose fin; some hatchery fish are deliberately left unclipped, so an intact fin does not prove wild origin. Follow current harvest, hook, and permit rules for the specific river section. Minimize handling and time out of water, and avoid dragging a fish onto shore. Use the IDFG fin-clip explanation and our license and permit guide before your trip.