How to Choose Your Flies For Wet-Fly Fishing

Choosing Wet Flies: Size, Color, and Pattern Guide

The Importance of Fly Selection

In our experience, dry-fly enthusiasts pay much more attention to the choice of flies they use than do wet-fly anglers. And the reasons are fairly evident.

The dry-fliers are working with only one single fly fished upstream on the surface of the water. It has to be the right fly, the one on which the trout are feeding, or one which may attract him to snatch.

The wet fly angler is reasonably careful about the flies he chooses, of course, but we have met some who are fairly successful consistently and they use the same three flies on their leader each time. However, understanding fly selection can significantly improve your success rate.

Understanding Wet Fly Types

Wet flies cover a broad range of subsurface tactics. Start with nymphs—they imitate late-stage nymphs roaming near the bottom.

Use heavily weighted Gold-Ribbed Hare’s Ear, Pheasant Tail, or copper John variants when confidence pool trout are tight to bottom. These patterns get down quickly and stay in the strike zone.

Soft hackles (partridge or hen feathers trailing on unweighted hooks) mimic emergers and drowned insects. Swing a partridge soft hackle in slow, clear water with twitching strips to trigger picky trout.

Streamers (woolly buggers, muddler minnows, zonkers) are larger, heavier wet flies meant to mimic baitfish and leeches. Match them to aggressive feeders or stain and move them with strips and pauses.

Traditional wets (March Browns, Blue Winged Olives, Lightning Bugs) drift in the film zone and mimic downed spinners or crippled adults. They’re ideal in riffles with modest current.

Knowing the motion and silhouette each category offers lets you choose the right rig for current speed, fish mood, and target depth. This foundational knowledge transforms your approach.

Matching Fly Size to Water Conditions

Water velocity, visibility, and season dictate size. Spring runoff calls for larger, easier-to-see patterns (number 6–8) because trout focus on bigger food and visibility is low.

As runoff subsides and light is bright, size down to number 12–16 to match delicate mayflies and midges. Warm midsummer pools with calm water often reward slender number 14–18 emerger-style wets.

High-visibility hooks with dropper knots keep these tiny flies manageable. In colder months or tannic waters, going a size bigger gives trout an easier target.

Match the size of emergers or drowned spinners to your fly spool. If local fish are taking tiny midges, don’t fight them with a number 10 bugger.

Keep a range of sizes on hand: a few number 10–12 for streamers and hemp nymphs, number 14–16 for soft hackles, and number 16–18 for small olive and caddis wets. Come down in size as the season changes from spring to summer.

Color Selection Strategies

Color choice relies on water clarity and light. In gin-clear water under bluebird skies, lean toward naturals—olive, tan, soft brown, and gray—blended with subtle flash.

When light filters through canopy or late-day low light, warmer tones (amber, copper, orange, chartreuse tipped) add contrast. Stained or tannic water favors bright or high-contrast patterns: black, purple, fire orange, and hot pink triggers from a distance.

In deep pools or on overcast days, flashabou thoraxes or beadheads reflect scarce photons. For soft hackles on cloudy afternoons, a rust body with partridge collar reads as a silhouette even when water color hides detail.

Switching the dubbing color or sparse ribbing is enough to transform the same pattern for different light. Carry two versions of favorites (olive and black buggers, for example) for quick adaptation.

Use a fly with red in it somewhere as an attractor, such as a Dunkeld or a Greenwell’s Glory, a March Brown and a Butcher as a team of flies. The red component often triggers aggressive strikes.

Building a Versatile Wet Fly Box

A versatile wet fly box is layered by depth and imitation. Start with a base of gold-ribbed hare’s ear and pheasant tail nymphs in sizes number 12–16, both beadhead and unweighted.

Add a row of soft hackles (partridge, ginger, and blue dun colorways), plus a few versions of the “hare’s ear soft hackle” for emergers. Include streamer-style wets—olive and black woolly buggers, muddler minnows in number 6–10, and a marabou leech in burgundy.

Toss in dry-dropper rigs (light dry for surface, dropper weighted wet fly) pre-rigged on tapered leaders. Don’t ignore springs or small brook-trout waters where smaller, soft hackle emergers shine.

Keep a zipped compartment with number 18–20 Lightning Bugs and size-16 emergers. Having weighted and floating rigs lets you swap depth quickly.

Double nymph setups, soft-hackle droppers, and single streamer rigs cover most species and waters. This layered approach ensures you’re prepared for any situation.

Reading Insect Hatches

Watching the air and the water pays dividends. During mayfly hatches, look for fish sipping in current seams: a soft hackle or a trailing emerger pattern behind a dry fly matches the natural.

When caddis flutter by, imitate the adults with a wet fly sporting a bright thorax (amber or tan) and gently twitched legs. Midge hatches, especially in cooler months or high alpine, call for tiny, dark emergers or soft hackles in number 18–22.

Keep a clip-on caddis pupa and midge at the ready. Anticipate spinners falling by tying on a size number 12–14 leech-style wet with trailing hackle.

The extra wiggle keeps the pattern in the strike zone longer than a dry. Take note of insect colors (green drakes, cream-colored caddis, black midges) and reflect those in your wet fly palette.

If ripples vanish with a soft rise, your target is likely a subsurface bug. Use a soft hackle drift or nymph to stay in the action.

Sink Rates and Weighting Options

Sink rate is everything in wet fly fishing. Weighted beadhead patterns and tungsten eyes drop quickly and hold the fly near the bottom, excellent for fast runs and heavy nymphs.

Bulky soft hackles or streamers need less additional weight. A tungsten bead and slotted tungsten cone keep them deep without needing split shot.

For delicate presentations, skip beads and opt for unweighted hooks tied with sparse materials. Allow the fly to sink naturally with a slow mend.

You can also add shot to the leader or use heavier tippet sections to control sink angle. Place a split shot 1.5 feet above the fly and keep the shot just enough to maintain contact without dragging.

In skinny water, rely on sink-tip or intermediate lines with lightly weighted wets. In deep riffles during spring runoff, fast-sinking beadheads paired with a NM or WF line soak the fly without snagging.

Match sink rate to current speed and desired depth. Experiment with one heavier and one lighter pattern to find where the fish lie.

Classic Wet Fly Patterns Every Angler Should Have

Every angler should carry a handful of proven wet flies. The soft hackle “Partridge and Orange” (partridge collar, orange silk body) flutters beautifully in slow water and is a go-to in spring creeks.

The “Hare’s Ear Soft Hackle” doubles as a nymph and emergent and is built into many strike indicators. “Gold-Ribbed Hare’s Ear” (beadhead or brassie) is a universal nymph that mimics mayflies and caddis larvae.

Tie it in sizes number 12–16 and fish it as a point fly. “Woolly Bugger” in olive, black, or brown covers leeches and baitfish.

Use a black version for night fishing or tannic water and olive for sunlit riffles. “Lightning Bug” in chartreuse/black or red/black drifts like a dipping spinner and is deadly during caddis hatches.

Add a “Muddler Minnow” when targeting bigger browns or stripers. Its spun deer hair head keeps it buoyant and activates with short strips.

“Wet March Brown” or “Little Black Stonefly” patterns with hackle and segmented bodies excel when trout refuse dries. These patterns read as drowned spinners and get noticed.

With these patterns, you can tweak color, size, or hook style to suit any river or lake. They form the foundation of a productive wet fly arsenal.

General Wet-Fly Fishing Advice

If asked to offer some very general advice on the subject of wet-fly fishing on rivers, we would say: Use lightly dressed flies. Those big lushy things you see in tackle shops may be all right in the far north of Britain or in other countries, but otherwise – not for us.

The spider-type flies do well in summer. Their sparse construction allows them to drift naturally in slower currents.

Don’t forget that as well as fishing wet-flies downstream, you can also fish them across the current and, in warm weather, even upstream. Although you have to raise the rod smartly to keep the leader from dragging.

This versatility is one of the great advantages of wet fly fishing. You can adapt your presentation to match conditions and fish behavior.

Putting It All Together

Wet flies offer so many entry points—matching type, size, color, and weight to the river’s story will keep you in the strike zone even when fish aren’t obliging on dries. Keep a blend of nymphs, soft hackles, and streamers in your box.

Learn to read the hatch, and dial in sink rate with beads and leader weight. Classic patterns give you a trusted baseline, and small variations let you mirror what the trout are chasing from beneath the surface.

Success in wet fly fishing comes from observation and adaptation. Watch the water, note what insects are present, and adjust your fly selection accordingly.

The most successful wet fly anglers are those who remain flexible. They’re willing to change flies, adjust presentations, and move to different water when the fishing slows.

Compare this guidance with your local watershed hatches so you can adapt the suggested patterns and sizes. Pack the suggested fly types and weights into a dedicated wet-fly compartment and test them on your next outing to fine-tune sink rates.

With experience, you’ll develop an intuitive sense for which flies to use in different conditions. This knowledge, combined with solid technique, will make you a consistently successful wet fly angler.