Best Flies for Clark Fork River (Montana)

What's hatching now

Month, insect, size, and pattern from the Clark Fork River hatch chart. August is highlighted when that month exists in the chart. We do not invent a hatch that is not on the chart.

Nymphs

Subsurface patterns matched to this river's chart and catalog. Fish them at the size the chart lists, not the size that looks good in the bin.

Midge

Zebra Midge

The Zebra Midge is the simplest and most effective midge pattern ever designed. A thread body with wire rib an

Size #16

Emerger

RS2

The RS2 (Rim's Semblance 2) is a devastatingly simple emerger pattern that hangs in the surface film imitating

Size #18

Nymph

Beadhead Caddis Pupa

This simple caddis pupa imitation features a dubbed body with a contrasting thorax and a soft hackle collar su

Sizes #12–#18

Egan's GTi Caddis

A weighted Hydropsychidae (net-builder) caddis larva with a contrasting shellback, designed around Hare-Tron d

Sizes #10–#14

Nymph

Dries

Dries and terrestrials for the Clark Fork River. If the chart says a size 18 PMD, do not start with a 12.

BWO Sparkle Dun

Craig Mathews design. Z-lon shuck, deer hair wing. Size 18-20 for spring BWOs.

Size #14

Dry

Dry

BWO Parachute

The BWO Parachute is a specific-color Adams variant tied to match the ubiquitous Blue-Winged Olive mayfly hatc

Size #16

Dry

Elk Hair Caddis

Al Troth's Elk Hair Caddis is the definitive adult caddis imitation. The palmered hackle body and tent-shaped

Sizes #12–#18

Dry

X-Caddis

Craig Mathews' X-Caddis omits the hackle of an Elk Hair Caddis, creating a lower-riding fly that hangs in the

Size #14

Dry

March Brown

The March Brown imitates Rhithrogena morrisoni, one of the first significant mayfly hatches of the season in w

Size #12

Dry

Stimulator

Randall Kaufmann's Stimulator is a large, buoyant attractor dry fly that suggests adult stoneflies, caddis, an

Size #8

Dry

Sparkle Dun

Craig Mathews' Sparkle Dun combines a deer hair fan wing with a Z-lon trailing shuck, bridging the gap between

Size #14

Terrestrial

Dave's Hopper

Dave Whitlock's Hopper is the original modern grasshopper imitation, featuring a spun deer hair head, knotted

Size #6

Terrestrial

Foam Ant

The Foam Ant creates the distinct two-hump silhouette of a real ant using closed-cell foam segments. Ant falls

Size #14

Dry

Comparadun

Developed by Al Caucci and Bob Nastasi, the Comparadun revolutionized dry fly design with its fan-shaped deer

Size #12

Dry

Goddard Caddis

John Goddard and Cliff Henry's spun deer hair caddis is the most buoyant caddis imitation ever conceived. The

Size #10

Egan's Corn-Fed Caddis

A heavy-winged CDC caddis dry with a Super Fine dubbed body, Antron shuck, Trigger Point overwing, and a CDC h

Size #12

Dry

Front End Loader Caddis

A hackle-stacker elk hair caddis with a Callibaetis Super Fine body, Glo Brite tag, and grizzly hackle wrapped

Size #10

Dry

Streamers

Streamers and wets for stained water, banks, and low light. This is not a claim that streamers are "on" today.

Wet

March Brown Wet

The wet fly version of the March Brown is a classic swing pattern for early season fishing. Its mottled brown

Size #12

Setup

4X and 5X cover most nymphing. 4X on dries until the fish get picky, then 5X. A 3.0–3.8mm tungsten on the point and a lighter dropper is a default until you see the water. Tight-line the near bank and the heads of pockets. Use an indicator only when you need to search water you cannot euro.

FAQ

What flies work on the Clark Fork River?

Start with Zebra Midge and RS2, then match size to the hatch chart for the month you are standing in. The Clark Fork River does not need a 40-pattern box. It needs the right size on the insect that is actually in the drift.

When is the best time to fly fish the Clark Fork River?

The editorial window we list is June, July, August, September, October. That is a planning month range, not a guarantee. Shoulder months can fish well if flows and water temperature cooperate.

Do I need a guide on the Clark Fork River?

Montana has walk-up wade water and, on some sections, float water. A guide is worth it for a first float or a technical tailwater. A hatch chart and a gauge are enough for a first wade if you already nymph. We list local guides and shops on this page when we have them.

Where can I see live flow for the Clark Fork River?

Open the Clark Fork River river page for the USGS gauge, access notes, and the same hatch chart this fly list is built from. We do not publish other people's spots or fish counts.

Is this a report of what's working now on the Clark Fork River?

No. Executive Angler does not publish other anglers' catches, GPS, or a crowdsourced hot fly. This page is hatch-chart patterns plus catalog flies. Presence on the river page is gauge and weather only.

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