Troutline

Lochsa River

Idaho·North-Central Idaho·46.33° N, 115.35° W
Flow
1,360 CFS
Lochsa River near Lowell
Water Temp
—
Condition
Below Normal
Weather
76°F
Mostly Clear
near Pierce

Insights

Wind
Wind 3 mph — calm
Easy casting and clean surface presentations.
Flow
Low flows at 1,360 CFS
Fish are spooky. Lighten tippet and lengthen leaders.
Snowpack
Snowpack snowpack update
Snowpack data for Lochsa River basin is limited right now. The June–July runoff forecast for Lochsa R nr Lowell is 55% of average.

The Lochsa is a 70-mile wild freestone that runs right beside U.S. Highway 12 for nearly its entire length, from the Crooked Fork and Colt Killed Creek confluence at Powell down to Lowell, where it joins the Selway to form the Middle Fork Clearwater. Idaho Fish and Game doesn't stock a single fish here, so everything you catch is native and wild — mostly westslope cutthroat, 10 to 15 inches and eager to eat off the top. The draw isn't size; it's clear-water pocket water full of trout that look up, in a roadless canyon of old-growth cedar where you're rarely more than a few steps from the truck. Bull trout to double digits hold in the deep cold holes, mountain whitefish are everywhere, and the whole drainage is a managed wild steelhead refuge.

Practically, this is a wade-and-walk river, not a trout float. The whitewater outfitters running the corridor are here for the Class III-IV rapids, not the fishing, and the wading is genuinely treacherous — bowling-ball boulders, deceptively deep pools, and heavy canyon current that make a wading staff earn its keep. The river is pure snowmelt, so it blows out hard and stays off-color through spring; most years it doesn't drop into shape until mid-July, and the prime window runs late July through October. A 5-weight covers most of it; step up to a 7- or 8-weight if you're swinging streamers for bull trout in the deep holes. Dry-dropper rigs and short, controlled drifts against fast water are the bread and butter, and the salmonfly-to-golden-stone progression from June into August is the marquee dry-fly event once flows drop.

Access is the easy part — dozens of Forest Service pullouts and campgrounds line US-12, and roadside fishing is free with a standard Idaho license. The trade-offs are remoteness and homework. There's no fly shop on the river; the nearest full-service shops are two hours east in Missoula, Montana, or down the Clearwater near Kooskia, and none guide or report on the Lochsa. Regulations reward reading the rule book: cutthroat are catch-and-release, bait is prohibited above the Wilderness Gateway bridge, bull trout are fully protected, and steelhead may not be targeted. The headwater tributaries — Crooked Fork and Colt Killed (White Sand) Creek — hold less-pressured, sometimes larger fish for anyone willing to hike in.

Species

  • Westslope Cutthroat Trout
    Primary · Jul-Oct · 10-15"

    The defining fishery — native, wild, and never stocked. Catch-and-release under Clearwater Region management. Eager dry-fly risers that will eat an attractor off the top in the pockets; identify by the red-orange slash below the jaw.

  • Rainbow Trout
    Common · Jul-Oct · 8-14"

    Native and naturalized, resident and secondary to the cutthroat, with some hybridization. Mixed in throughout the pocket water.

  • Bull Trout
    Present · Protected · to 10 lb

    Native char and fully ESA-protected — no targeting or harvest, immediate release if hooked incidentally. The big fish of the river, holding in the deep cold holes; a streamer swing in the deep runs is where you might connect.

  • Mountain Whitefish
    Abundant · Year-round · 8-16"

    Native and everywhere, readily taking nymphs. Often overlooked, but a good sign of healthy water and something to keep a slow day interesting.

  • Brook Trout
    Present · Jul-Sep · 6-10"

    Introduced and holding in the alpine headwater tributaries (Swamp and Hoodoo Creeks off Elk Summit Road), not the mainstem. Small but willing on attractor dries.

  • Steelhead
    Present · Protected · to 30"+

    Wild steelhead refuge — no hatchery fish, and targeting is prohibited unless a season is specifically opened. Anadromous run in fall and winter; part of what makes this a managed wild fishery.

  • Chinook Salmon (spring run)
    Present · Protected · large

    Anadromous spring chinook spawn in the system in summer. Protected — no fishing. Their presence underscores the wild, intact character of the drainage.

Ideal wading flow1,000–2,500 CFS
Blow-out>5,000 CFS
Ideal water temp48–62°F

Late July through September is the heart of it — clear, dropping water with stonefly and terrestrial dry-fly fishing at its best. October adds October caddis and fall BWOs on an emptier river, sometimes into Thanksgiving. June can produce salmonflies if the flows cooperate, but the river is often still high and pushy that early. Spring is largely a write-off to runoff. At the Lowell gauge (13337000) the river fishes well from roughly 1,000 to 2,500 CFS, clear and dropping; peak snowmelt runs well into five figures and is unfishable. Watch water temps on hot late-August afternoons and fish mornings and evenings in a heat wave.

Sections

5 sections on this river

Crooked Fork Creek (Tributary)

WadeCutthroat · Rainbow Trout

A hike-and-wade headwater tributary entering the Lochsa at Powell and running northeast along US-12 toward Lolo Pass. Less pressure and surprisingly good-sized wild westslope cutthroat trout for anglers willing to walk in.

Best for: Small-stream westslope cutthroat trout on attractor dries; solitude.

Upper Lochsa — Powell to Wilderness Gateway (C&R)

WadeSalmon · Cutthroat · Rainbow Trout

Classic freestone pocket water and plunge pools through the upper canyon — colder, clearer, and higher-gradient, the reach anglers most associate with wild westslope cutthroat trout. US-12 pullouts and Forest Service campgrounds line it from Powell down to Wilderness Gateway. Catch-and-release, with bait prohibited above the Wilderness Gateway bridge.

Best for: Wild westslope cutthroat trout on dries and dry-droppers; salmonflies and golden stones early in the season.

Colt Killed / White Sand Creek (Tributary)

WadeCutthroat · Rainbow Trout

The south headwater fork at Powell, a hike-in creek where juvenile rainbow trout hold near the trailhead and larger wild cutthroat trout come the deeper you walk. Part of the roadless upper drainage.

Best for: Hike-in westslope cutthroat trout and rainbow trout on dries.

Lower Lochsa — Wilderness Gateway to Lowell

WadeCutthroat · Bull Trout · Rainbow Trout · Whitefish

Larger-volume pocket water and longer runs as tributaries add flow — the most accessible, most-fished water, and the reach the primary USGS gauge near Lowell sits on. Continuous US-12 pullouts run down to the Selway confluence at Lowell. General trout regulations apply below the Wilderness Gateway bridge.

Best for: Westslope cutthroat trout and mountain whitefish; bull trout on streamers in the deep holes; hopper-dropper in late summer.

Fish Creek (Tributary)

WadeSteelhead · Cutthroat · Rainbow Trout

A major tributary entering the lower river, part of the wild steelhead refuge. Hike-in wild westslope cutthroat trout water away from the US-12 crowds.

Best for: Wild westslope cutthroat trout in a low-pressure tributary setting.

Regulations

Current fishing rules and restrictions

The Lochsa and its tributaries are a managed wild steelhead refuge with no hatchery fish — steelhead may not be targeted unless a season is specifically opened. Cutthroat trout are catch-and-release under Clearwater Region management, and bait is prohibited above the Wilderness Gateway bridge, where the upper reach fishes as catch-and-release. Bull trout are fully ESA-protected.

  • Cutthroat trout: catch-and-release (0 harvest) under Clearwater Region rules — release any trout with a red-orange slash below the jaw
  • Bait prohibited above the Wilderness Gateway bridge; that upper reach is catch-and-release
  • Bull trout: fully ESA-protected — no targeting, no harvest, immediate release if hooked incidentally
  • Steelhead: wild steelhead refuge — targeting prohibited unless a season is specifically opened
  • Chinook salmon: protected, no fishing
  • Valid Idaho fishing license required (nonresident daily and season options available)

Regulations here are researched for the 2026 general season — always confirm the current-year Idaho Fish and Game rule book before your trip, as cutthroat, bull trout, and steelhead rules and zone boundaries change annually. The general trout season typically opens the last Saturday in May and runs through November 30.

Source: Idaho Department of Fish and Game — Fishing Planner. Regulations change annually — verify before fishing.

Access & Logistics

Getting there, fly shops, and lodging

Getting There

Lowell, ID

~2 hr from Missoula, MT (MSO) over Lolo Pass via US-12; ~2.5-3 hr up the Clearwater from Lewiston/Clarkston (LWS)

Camping & Lodging

No fly-fishing lodge sits on the fishing water. Anglers camp at the numerous USFS campgrounds directly on US-12 (Wilderness Gateway, Wild Goose, Whitehouse, Powell) or base out of Lochsa Lodge near the headwaters at Powell and lodging near Lowell, Kooskia, and Kamiah. Missoula, MT is the nearest city.

US-12 follows the river for its entire fishable length with dozens of pullouts and campgrounds — you're rarely more than a few steps from the water. Roadside fishing is free with a standard Idaho license; the corridor's outfitters run whitewater trips, not guided fishing, and last-stop supplies and licenses are in Kooskia and Kamiah to the west or Missoula to the east. The wading is genuinely hazardous on slick boulders in heavy current — carry a wading staff.

Conditions data is live from public monitoring networks. Regulations change annually — always verify current rules with your state fish & wildlife agency before fishing.

More in Idaho

View all 17 rivers

North-Central Idaho

Clearwater RiverID

A big, cold, low-elevation river that draws anglers from all over for one thing: B-run steelhead — the largest summer-run steelhead south of the Canadian border, ocean-going rainbows that average 10-13 pounds and push past 20. It's classic spey country, swung flies on broad even-depthed runs from Lewiston up through Peck and Lenore, with a shoulder-season dry-fly window for native westslope cutthroat and rainbows when the main stem drops and cools.

North Fork Clearwater RiverID

A big, remote freestone above Dworshak Reservoir holding one of the Northwest's best wild westslope cutthroat fisheries — 79 roadless-feeling miles of pocket water and green runs where eager natives eat attractor dries. Its tributary Kelly Creek has been catch-and-release since 1970.

Selway RiverID

A remote wilderness freestone draining the heart of the Selway-Bitterroot, home to one of the most intact native westslope cutthroat populations left in America. The lowest 21 miles below Selway Falls are the only road-accessible, DIY water; everything above is a permit-only, lottery-drawn Class III-IV float. Snowmelt-driven with a short, sharp season — it rarely drops into shape before mid-to-late June, then fishes big dries through summer.

Other regions

Big Lost RiverID

A high-desert freestone under the Pioneer and White Knob ranges that turns, below Mackay Reservoir, into a short cold tailwater growing wild rainbows past 20 inches — then spreads out below Arco and sinks into the desert at the Big Lost Sinks without ever reaching the sea.

Big Wood RiverID

The freestone that runs down the spine of the Wood River Valley past Ketchum, Sun Valley, Hailey, and Bellevue — a wild, unstocked river of heavily spotted rainbows and thick lower-river browns, best fished on foot with a dry-dropper once July runoff clears.

Boise RiverID

The rare trout tailwater you can fish on a lunch break — cold, clear water off the bottom of Lucky Peak Dam runs straight through downtown Boise, paralleled the whole way by the paved Greenbelt. Wild brown and rainbow trout (browns commonly 16-20 inches), native redband, and abundant mountain whitefish. Flood-control and irrigation releases dominate: summer often pushes 1,000-7,000+ CFS and fishes poorly, but the river turns on after irrigation season ends in fall and through winter at a wadeable 150-600 CFS.

Fall RiverID

The Fall River is the largest tributary of the Henry's Fork, a runoff-fed freestone that tumbles off the Pitchstone Plateau in southwest Yellowstone, past a string of waterfalls, and out onto the potato ground east of Ashton. It fishes late — high and off-color into June, then a July salmonfly-to-PMD dry-fly river most Henry's Fork anglers drive right past.

Henry's ForkID

The Henry's Fork is the spring-fed tailwater that runs from Henrys Lake through Island Park and on to its confluence with the South Fork Snake near Rexburg. The slow flat water of Harriman State Park (the Railroad Ranch) is the most famous technical dry-fly stretch in the West.

Middle Fork Salmon RiverID

A hundred miles of roadless westslope cutthroat water running through the heart of the Frank Church–River of No Return Wilderness. Access is a five- to six-day float on a private lottery permit or an outfitted trip; the reward is eager dry-fly cutthroat protected as catch-and-release with single barbless hooks since 1973.