SWTU, P.O. Box 45555, Madison, WI 53744-5555 president@swtu.org

Swanson’s Wet Dry Fly

Rusty Dunn Swanson Wet Dry Fly

Fountains of Youth – Classic trout flies that have withstood the test of time … flies that remain “forever young”

by Rusty Dunn

Ojibwe natives called the river Wiisaakode-ziibi (“river through half-burnt woods”) due to the many for­est fires that scarred its valley. The Ojibwe traveled in birch bark canoes, carrying furs and other goods upstream from Lake Supe­rior, across headwater bogs, and down the St. Croix River to the Mis­sissippi basin. French fur trad­ers trans­lated Wiisaa­kode-ziibi as Bois Brulé (“burnt wood”) River, which re­mains the name today. Most Wis­con­sin­ites, how­ever, simply know it as “The Brule”. When the great north woods beckon Wiscon­sin anglers, the Brule is often their destination.

The Brule once held 10 pound brook trout, but the rav­ages of 19th century logging forced such trout back to Lake Superior. The river slowly re­covered, how­ever, and by the 1920s be­came a haven for sum­mer re­treats of wealthy Midwest­erners and power bro­kers of the Eastern establish­ment. Stately homes and lux­ury accommodations prospered among the Brule’s iso­la­tion and unspoiled natural beauty. Well-heeled an­glers, including at least five US presidents, fished its cold clear waters. In the words of Wisconsin au­thor Gor­don Mac­Quarrie, “The Brule, edged with ce­dar and spruce, is your artist-fish­erman conception of the way a trout stream ought to look.”

The Brule is Wisconsin’s most famous river and was home water of Sid Gordon, arguably Wisconsin’s most famous fly an­gler. Gordon (1885-1956) worked during the 1930s for the Wisconsin Conservation Department (predecessor of today’s DNR) supervising lake and stream improvement in northern Wisconsin. He designed and built hundreds of stream improvement structures on the Brule. Gordon was a nation­ally known expert on water chemistry, water quality, aquatic vege­tation, and how those factors affect in­sect and fish pop­ulations. He developed a remarkably accurate method for cal­culating a river’s carrying capacity (pounds of fish per acre foot) solely from its chemical analysis.

After leaving the Conservation Department, Gordon was a prolific writer, both regionally for Wisconsin newspa­pers and nationally for high profile outdoor magazines.

His 1955 book How to Fish from Top to Bottom was the first to discuss fly fishing from the per­spective of a pro­fessional biologist, stream ecol­ogist, and entomol­o­gist. Gordon was a tremendously successful angler, which derived from his knowing in detail the bi­ol­ogy of insects and trout. Gordon’s book is a practi­cal, no-nonsense guide to fishing the wa­ter col­umn, espe­cially the unseen and, to many, mysterious world be­low the sur­face. If you’ve ever wanted to learn how to fish nymphs, Gor­don’s book is a good place to start. Gor­don’s angling insights were well ahead of his time and influenced many later authors. For example, Pennsyl­vania’s leg­endary Char­lie Fox de­scribed Gordon’s book as the “best book on fishing I’ve ever read”. Gary Lafon­taine (of Caddisflies (1981) fame) cred­its Gordon as inspiring him to study the life cycle and behavior of cad­disflies. Even today, How to Fish from Top to Bot­tom, often appears on lists of the greatest American fly an­gling books ever pub­lished.

Sid Gordon was the first to describe in an­gling pub­lica­tions the underwater egg-laying behavior of cad­disfly fe­males. He observed that egg-laden females of many caddis species swim or crawl under­water and deposit their eggs on rocks at the bot­tom. Such egg-laying females have sparkle and move­ment like no other insects, for they are highly mobile and en­vel­oped in a bub­ble of light-reflecting air carried from the surface. The legs serve as oars and propel such egg-layers quickly through the water. These are not drowned, inert, or dead adults; they are very active and highly mobile. Such behavior had previously been de­scribed only in inaccessible sci­entific litera­ture, but Gordon brought it to the attention of everyday anglers. Gordon showed that, in addition to nymphs, wet flies, and dry flies, a fourth type of imitation is needed to imitate sub-surface winged adults actively laying eggs.

Sid Gordon designed a remarkably effective fly to imi­tate un­derwa­ter egg-laying caddis. His “Wet-Dry Fly” is “Wet” because the in­sect being imitated is underwa­ter, but it is “Dry” be­cause the insect itself is bone dry, being ensheathed in a sparkling bubble of air, which Gordon compared to “a shining ball of quicksil­ver”. Gordon named his pattern the “Swanson Wet-Dry Fly” in honor of his good friend Seegar Swanson Sr., who persuaded Gordon to write “How to Fish from Top to Bottom” and served as its editor during publication.

Copyright 2025, Rusty Dunn


Swanson’s Wet Dry Fly 

Rusty Dunn Swanson Wet Dry Fly

A body of reflective tinsel sparkles as the Wet-Dry Fly tumbles in the currents, thereby imitating egg-laying caddis encased in a bubble of air.

Hook:

Heavy nymph hook, #4 – #10

Thread:

Not specified, but black or dark gray work well

Body:

A fat body of white mercerized floss, covered completely with 1/16” silver tinsel

Wings:

Three sections of turkey tail feathers, pulled over the body with gaps showing in between

Legs:

Tip ends of the turkey tail fibers gathered and tied as a beard