Legendary Waters · The Horn

Bighorn River Fly Fishing

A giant spring creek below Yellowtail Dam, and maybe the finest tailwater trout fishery in the country.

River typeTailwater
Put-inFort Smith, Montana
Fly intoBillings (BIL)
Best forEvery skill level

The Horn

A giant spring creek

Flowing out of Yellowtail Dam, the Bighorn may be the finest tailwater fishery in the United States.

Anglers notice the clarity first, then the thick aquatic weed beds that feed huge numbers of brown and rainbow trout. A gentle current and gravel bottom make it easy to wade. Like a spring creek, dry fly fishing can be technical, but the nymphing is consistent and can net a lot of big fish when it’s done right. It can spoil a beginner and challenge an expert on the same day.

Good to know: The Bighorn runs through the Crow Reservation, which is dry, so alcohol can’t be bought in Fort Smith. Your guide carries the National Park Service parking pass for the Afterbay and 3 Mile accesses. If you drive in on your own, passes are $5 a day or $30 a year.

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Angler with a Bighorn River rainbow troutBrown trout landed from the drift boat on the BighornSunset over Fort Smith, MontanaBaetis mayfly on the Bighorn

Through the season

When to fish the Bighorn

The Bighorn fishes year-round. Water temperatures stay steady below the dam, so there’s a good day to be had in every month.

Winter

December to February

Midges on calm afternoons and steady nymphing for anglers who don’t mind the cold. Few boats on the water.

Spring

March to May

Blue-winged olives and some of the best nymphing of the year as fish feed hard after winter.

Summer

June to August

PMDs, caddis and black caddis, with hoppers along the banks by late July.

Fall

September to November

Tricos, a second round of baetis and aggressive pre-spawn browns. Cool mornings and quiet water.

Guided floats

Full-day trips on the Bighorn River

1 Angler
$650
Full-day float, per boat
Book 1 angler
Most booked
2 Anglers
$700
Full-day float, per boat
Book 2 anglers
3 Anglers
$750
Full-day float, per boat
Book 3 anglers
All flies and terminal tackle
Streamside lunch and drinks
Transportation to the river
Casting and technique instruction
No booking fees.

Our online booking doesn’t add a single fee at checkout. The price you see is the price you pay, and every dollar stays with your guide.

Book your day on the river

Pick a date, choose your party size and reserve your boat online in minutes. No booking fees, ever. The price you see is the price you pay.