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Sulphur DunDry Flyintermediate

Midwest & Driftless

Sulphur Dun

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Available Sizes#14 - #18
Color Variations
Pale YellowCream

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Regional source directory

Regional shop

Driftless Angler

Matched on Midwest & Driftless, dry flies, trout. Driftless-specific trout source for spring creek nymphs, dries, and local bug windows.

Midwest & Driftlessdry flies
Broad catalog

Fly Fish Food

Matched on dry flies, trout, mayfly. Strong technical tying and trout catalog coverage, especially nymphs, dries, and stillwater flies.

dry fliestrout
Broad catalog

Fulling Mill Flies

Matched on dry flies, trout, emerger. Large pattern house with broad freshwater and saltwater fly categories.

dry fliestrout
Regional shop

Dette Flies

Matched on dry flies, trout, mayfly. Catskill lineage fly shop with deep dry-fly, wet-fly, and Northeast trout relevance.

dry fliestrout

These are independent businesses. A listing does not imply endorsement or partnership. TWG currently receives no purchase commission from these links. Any future paid or affiliate relationship will be labeled beside the relevant link.

When sulphurs start popping off on a Driftless spring creek in late May, the fishing goes from good to unreasonable. These pale yellow mayflies drift down the current like tiny lanterns at dusk, and every trout in the river decides simultaneously that dinner is served. The hatch lasts about an hour, which is exactly long enough to make you late for everything you had planned that evening.

Quick Facts

TypeDry Fly
Difficultyintermediate
SeasonsSpring, Summer
Target SpeciesBrown Trout, Rainbow Trout
Sizes#14 - #18
Best LocationsWhitewater River, MN; Roaring River, MO; Bennett Spring, MO

Where to Fish It

Whitewater River

MN · Spring Creek

Roaring River

MO · Spring Creek

Bennett Spring

MO · Spring Creek

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Related Reading

region guide

Driftless Area: Spring Creek Paradise

Tucked into the unglaciated hills of southwestern Wisconsin, southeastern Minnesota, and northeastern Iowa lies the Driftless Area — a landscape of cold spring creeks, limestone bluffs, and wild trout that rivals any destination in the country. This is the complete guide to fishing the Driftless.

hatch guide

The Complete Guide to Mayfly Hatches

Mayflies are the foundation of trout-stream entomology. This guide covers every major hatch — BWOs, PMDs, Green Drakes, Sulphurs, Tricos, and Hendricksons — with the biology, timing, and fly selections you need to fish them effectively across the country.

hatch guide

The Hex Hatch: After Dark on the Great Lakes

The Hex hatch is the defining event of Great Lakes fly fishing — a massive emergence of North America's largest mayfly that happens after dark and brings the biggest brown trout of the year to the surface. This is how to prepare for, find, and fish the most anticipated hatch in the Midwest.

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