Fly Fishing Tongue River - Canyon to Dayton

Fly fishing the Tongue River in Wyoming immerses anglers in the forested canyons and high-country meadows of the Bighorn Mountains. The river begins as two branches — the North Tongue and the South Tongue — before joining to form the main Tongue River near Dayton, Wyoming. With crystal-clear flows, abundant insect life, and strong populations of wild trout, the Wyoming headwaters are a beloved destination for anglers who value both scenic solitude and productive fishing.

The Tongue River in Wyoming is a freestone fishery characterized by a mix of meadow water and steep canyon runs. The North Tongue above Dayton offers gentle meadow stretches with riffles, undercut banks, and beaver ponds, making it prime dry-fly water. The South Tongue and the main river closer to Dayton have more gradient, featuring pocket water, fast riffles, and boulder-strewn runs. Together, these branches offer a variety of angling opportunities suited to different styles and seasons.

Trout species in the Wyoming Tongue include native Yellowstone cutthroat, wild browns, and rainbows. The North Tongue in particular is renowned for its Yellowstone cutthroat population, with fish in the 10–14 inch range common and larger specimens possible. Browns and rainbows become more prevalent further downstream, particularly below Dayton, where the river widens and gains volume. While fish are not always large, they are wild, eager, and perfectly suited to light tackle and technical dry-fly fishing.

The hatch diversity makes the Tongue River a dry-fly angler’s paradise. In spring, midges and blue-winged olives dominate, followed by caddis and PMDs in early summer. July and August bring golden stoneflies, yellow sallies, and prolific terrestrial activity along grassy banks. Hoppers, beetles, and ants often produce explosive takes in meadow reaches. Fall sees another round of blue-winged olives, with streamer fishing effective for aggressive browns as they prepare for the spawn.

Flows between 50–200 CFS provide the best wading and fishing conditions. Runoff in late spring can swell the river, making it high and off-color until early summer. By July, flows stabilize and the river becomes highly accessible to wading anglers. Access is excellent along U.S. Highway 14 in the Bighorn Mountains, with numerous Forest Service campgrounds, pull-offs, and trails leading to productive stretches of the North and South Tongue. The headwaters above Dayton are managed for quality wild trout fisheries, ensuring consistent angling opportunities.

For anglers seeking a classic Wyoming small-river experience with a strong native cutthroat presence, fly fishing the Tongue River headwaters is a must. The combination of high-country scenery, abundant insect hatches, and wild trout makes this a rewarding destination for both beginners and seasoned fly fishers.