Indicator nymphing

What it is

A nymph is a fly that imitates the underwater stage of an insect. Trout eat most of their food below the surface and near the bottom, so the nymph has to get down there and drift at the speed of the current. An indicator is a small float fixed to the leader above the fly. It holds the fly at a set depth, and it shows you the take: when a trout eats the nymph, the indicator stops, twitches or goes under.

KDFWR's December 2023 column on the Cumberland tailwater puts the whole method in three sentences: "A good technique involves suspending the nymph under a floating strike indicator." "The strike indicator serves as a bobber; it allows the nymph to drift at the same speed as the current." "If the strike indicator disappears, a trout has inhaled the nymph." The same column calls nymph fishing "an excellent way to introduce someone to fly fishing."

If you have come from spinning gear, it is a float rig with a fly instead of bait, cast with fly line. The depth is set by where the indicator sits on the leader, the same way a bobber stop sets a slip float.

Basis: official (KDFWR, Lee McClellan, 26 December 2023); editorial on the float comparison

The words on this page

• Indicator, strike indicator, bobber. The same thing: a float on the leader. Types are in "The indicator" below.
• Leader and tippet. The leader is the clear tapered line between the fly line and the fly. Tippet is the thin level line tied to its end. Our leaders and tippet page explains both and carries the X-size chart: the bigger the X number, the thinner the line.
• Dropper. A second fly tied below or off the first one, on its own short piece of tippet.
• Split shot. A small soft-metal ball pinched onto the leader to add weight. BB is a size of shot.
• Tungsten bead, jig-style nymph. A bead of tungsten at the head of a fly sinks it faster than brass or lead; a jig-style nymph rides with the hook point up.
• Dead drift. The fly moving at exactly the speed of the current, with nothing pulling it.
• Drag. The line or leader pulling the fly or indicator faster or slower than the current. Not the reel's drag.
• Mend. A flip of the line upstream or downstream with the rod tip, after the cast, to take the pull of the current off the drift.
• Seam, run, riffle, drop-off. A seam is where fast and slow water meet; a run is a deeper, smoother stretch; a riffle is shallow broken water; the drop-off is where a riffle falls into deeper water.
• Tight-line or Euro nymphing. Nymphing with no float, the line held taut from rod tip to flies, reading the take through the line.
• Generation. On a tailwater, the dam releasing water through its turbines. The river rises when it starts.

Basis: editorial definitions of standard terms

When it wins

• Tailwater trout feeding near the bottom. KDFWR's John Hast fishes nymphs under small foam indicators on the Cumberland tailwater, and his rule is plain: "Your fly needs to be near the bottom to have any luck on the Cumberland River" (KDFWR, 2023).
• Flowing holes with cover. The same column: "The flowing holes with hides in the form of rocks or undercut banks make the best places to fish nymphs and Woolly Buggers in winter."
• Fall on the smaller tailwaters. Hast, in KDFWR's October 2020 column: "We've done well on the Dix River in October and into November running a zebra midge beneath a strike indicator." That is the river below Herrington Dam.
• A long, slow pool below a riffle. Orvis's article on nymphing a slow pool builds an indicator rig for exactly that water and gives the depth and mending steps used below.
• New anglers. Orvis's Euro-nymphing lesson concedes the indicator's one big advantage in plain words: "The bobber does all the work for you." KDFWR's 2023 column calls the method a good introduction to fly fishing.

Where it loses, the sources are specific: water with fast current on top and slow current at the bottom, where the indicator runs ahead of the flies and drags them up (Orvis), and the shallow riffles and small streams where our dry-dropper page's sources put a dry fly to work as the indicator. Both are in "When something else is better."

Basis: official (KDFWR columns of 26 December 2023 and 28 October 2020); Orvis

The parts

Basis: Orvis; maker (RIO); official (KDFWR)

Rod, reel and line

Beginner. Our pick, editorial: a 9 foot 4- or 5-weight with a floating line. KDFWR's Hast "fishes a 4-weight fly rod for nymphs and a beefier 6-weight rod for throwing Woolly Buggers" on the Cumberland. A 5-weight is our choice for a single rod that also handles some wind and a heavier rig; that is editorial. Our fly rod, reel and line setup page explains line weights and how to match them.

Beyond the beginner setup. The rod matters less than the leader, the weight and the drift, which take up the rest of this page (editorial).

Basis: official (KDFWR) on Hast's rods; editorial on the 5-weight

Leader and tippet

The sources run from 9 to 12 feet of leader, with fine fluorocarbon tippet to the flies.

The Orvis lesson's reason for the finer, longer tippet: "this 5X cuts through the water better than a heavier diameter tippet," and he uses the lightest tippet he thinks he can get away with for the snags and the size of the fish. RIO describes its Indicator Leader as having "a powerful butt section and very short taper" that "easily turns over all manner of indicators," with "a long, level tip section" that "allows flies to sink evenly and quickly." Note that the two Orvis pieces differ on both the leader and the tippet; both are published by the same company.

Our starting point, editorial: a 9 to 12 foot leader ending in 4X, with 2 to 3 feet of 5X fluorocarbon tippet to the first fly, a double surgeon's knot at the join. Step up to 4X tippet with heavy flies or around snags, as the Orvis lesson does.

Basis: Orvis (two pages that differ); official (KDFWR); maker (RIO); editorial on the starting point

The indicator

Orvis's lesson on indicator types describes seven. What it says of each:

• Thingamabobber, a soft air-filled plastic ball. Fold the leader into a loop, pass it through the hole, take the loop around the ball and snug it. It "floats really, really well," and can be moved by loosening it.
• Airlock, harder plastic. Unscrew the top, lay the leader in the slot over a rubber grommet, screw it down. It moves easily and "doesn't put a kink in your leader."
• Hard body with a tab (cork, foam or plastic), pegged in place. Easy to move, but it tends "to catch on your leader and get tangled."
• Solid cork, attached like the Thingamabobber. It "bounces along on the current really nicely."
• Twist-on, a small hard piece held by a rubber band when twisted.
• Foam sticky-back. Light and sensitive, but it cannot be moved, and the presenter dislikes it because "they come off and they never disintegrate."
• Yarn (sheep's wool), made with a kit and a tubing tool so you can size it. "One of my favorites," because "it's biodegradable."

Two makers' products, as described for this page. Feather-Craft's listing for the New Zealand Strike Indicator kit: "The tool's hook grabs the leader, and a small piece of tubing slides into place over the leader (forming a loop)," which "fastens yarn in place when you pull the leader taut," with "easy removal or adjustments to change depth," and it "won't damage the leader." That is a retailer's description, not a maker's instruction sheet. RIO's Kahuna LT is a hollow tube: you break off the length you need and thread the leader through its tunnel, and it "grips on to a tapered leader and stays in place without any damage to the leader." RIO offers it thin for calm water and smaller flies, and thick for rougher water and lower light.

Size. Smaller is better, as long as it floats the rig. Orvis's multiple-flies article: "the smaller your indicator is the better," and "Typically, the ½" size is all you need for most trout fishing." The indicator rig lesson: "I try to get as small an indicator as I get away with." KDFWR's Hast "uses small, foam strike indicators for stealth as well as a more realistic drift," and with tungsten-head flies "attaches two small foam indicators to the fishing line instead of one large one."

Color. The Orvis rig lesson likes white where fish are spooky, "because it looks like bubbles on the water," and says fish in some streams shy from pink and orange. RIO's Kahuna comes in chartreuse, orange and white.

Our pick for a beginner, editorial: a small air-filled or foam indicator you can slide without retying, because you will move it more than any other part of the rig.

Basis: Orvis; maker (RIO); retailers' descriptions of the New Zealand kit; official (KDFWR); editorial on the pick

One fly or two

The Orvis indicator rig lesson usually fishes two nymphs, where the rules allow it. The order and the attachment:

1. The heavier fly goes on first, on the end of the tippet.
2. The second, smaller fly hangs below it, tied to the bend of the first fly's hook on about 8 inches of tippet to start, the same size as the main tippet or one size finer. The lesson uses a jig-style nymph for the lower fly because its hook rides point up: "it's a lot harder to snag them on the bottom."
3. Dropper length runs about 4 to 20 inches, with no firm rule, in that lesson: shorter (6 to 8 inches) in fast, deep water where the lower fly must get to the bottom, and longer if fish take the upper fly and get foul-hooked on the lower one.

Orvis's multiple-flies article spaces them wider: 16 inches of 4X tied to the bend of the first fly. Other ways to attach the second fly, in the rig lesson: to the eye of the first fly; on the long tag of a surgeon's or blood knot above the heavier fly; or two pieces of tippet off a tippet ring.

Weight comes from the flies first. The rig lesson's examples: a size 14 beadhead over an unweighted size 16 may be enough in a small stream about three feet deep; a fast, deep river may need a size 8 weighted stonefly nymph over a size 12 beadhead. KDFWR's Hast uses tungsten "in swifter current because the tungsten bead gets the fly down in the water where you need to get."

One fly is fine, and simpler. Our dry-dropper page covers the bend, eye and tag methods in more detail, and the arguments over each.

Basis: Orvis (two pages that differ on spacing); official (KDFWR)

Knots

• Fly to tippet: the improved clinch, or the non-slip loop where you want the nymph to move freely. Neither Orvis page we read names the knot for the flies; this pairing is editorial and follows our knot pages.
• Second fly to the bend of the first: the same improved clinch, tied around the bend (editorial, as on our dry-dropper page).
• Tippet to leader: the double surgeon's. The Orvis rig lesson names the surgeon's knot and the blood knot for the tag-end dropper.
• Leader to fly line: loop-to-loop.

Basis: Orvis on the surgeon's and blood knots; editorial on the rest, labelled here

Split shot

The sources agree on two things: get the depth from the flies first, and if you must add shot, start small. The Orvis weighting lesson: "it's better to start with a small one, rather than put on a big glob of a shot." Add a second only if the first does not get you down.

Where the shot goes, the sources do not agree, and some of the disagreement is inside Orvis:

The last one is the drop-shot arrangement: weight at the end, flies above. Our drop shot page has its fly-rod version and where it came from.

Our starting point, editorial: one small shot about 8 inches above the upper fly, from the adding weight lesson, because it is the only one of the four that gives a rule for moving it.

Basis: Orvis (four pages that differ); editorial on the starting point

Setting the depth

The indicator goes above the flies at more than the water's depth. The Orvis indicator rig lesson's reason: the rig is always drifting at an angle, not straight down.

• About 1 1/2 times the depth. Orvis's nymphing article: "The general rule of thumb when fishing streams is the indicator should go above the fly about 1-1/2 times the water depth." The slow-pool article uses the same figure, measured where the riffle drops into the pool.
• 1 1/2 to 2 times. The Orvis indicator rig lesson. In about three feet of water, the presenter sets the indicator about six feet up.
• Start high and move it. KDFWR's Hast: "I attach the strike indicator just below where I tie on the tippet to the leader to start," and then "adjusts depth by moving the strike indicator up or down from there."

Measure the depth roughly. The slow-pool article: wade close and estimate, or probe gently with a wading stick or the tip of the rod; the measurement "doesn't have to be exact," but "it does have to be close."

Then check it on the water. The Orvis weighting lesson's test is the indicator itself: with the flies close to the bottom, it lags slightly behind the bubbles on the surface, which the presenter calls "very subtle." In the lesson, a rig that was not "taking bottom at all" got one small shot, then a second, which "did the trick." The nymphing article's other adjustment runs the opposite way: if you are catching only fish you do not want at one depth, take off the shot and slide the indicator down to fish the middle of the water column.

Basis: Orvis (three pages agree on 1 1/2 times; one extends it to 2); official (KDFWR)

The cast

An indicator rig with two flies and shot does not cast like a dry fly. Orvis's multiple-flies article describes a water-loaded lob: let the current straighten the rig below you at the end of the drift, lift the rod tip to bring it off the water, and "Lob your rig upstream like you're throwing a ball," pointing the rod tip where you want the flies to go. Its warning: "slack is evil when casting indicators."

Cast well above where you want the flies to be deep. The slow-pool article casts 5 to 6 feet above the drop-off, then mends so the flies are drifting drag-free by the time they reach it.

Basis: Orvis

The drift and the mend

The job is a dead drift: the indicator and the flies moving at the speed of the current with nothing pulling them. Orvis's mending lesson for nymphs: "90% of the time, dead drift is the way to go."

• Mend to the indicator, not past it. "Just be careful to mend enough that you go all the way to the indicator but without moving it." The reason: "Moving the indicator moves the flies as well."
• Mend in the direction the water tells you. "If the water next to you is faster than the water your flies are drifting in, mend upstream." When the water between you and the flies is slower, mend downstream.
• In deep water, mend early and often. The slow-pool article: "Mend like crazy so your flies sink."
• Watch the end of the drift. The mending lesson notes that takes on a dragging nymph often come at the end of the drift, when the flies rise off the bottom. Let it finish before you pick up.

When you cannot tell if it is dragging, Orvis's two-indicator system helps: two small indicators of different colors 8 to 15 inches apart, the lower one at your usual depth. While the upper one stays upstream of the lower one, the drift is decent; when the two line up, mend until the upper one is back upstream.

Basis: Orvis (mending lesson, slow-pool article, two-indicator lesson)

Reading the indicator and setting the hook

What a take looks like. KDFWR: "If the strike indicator disappears, a trout has inhaled the nymph." MidCurrent's piece on the nymphing hook set says to act if the indicator "pauses or wobbles weirdly or goes under," and not to assume it is the bottom. Its guides' maxim: "Hook sets are free."

Set early. MidCurrent: "Ideally, you should set the hook at the first sign of a take."

Set downstream and low. MidCurrent: "Always sweep to your downstream side," with the rod kept parallel to the water and the line hand pulling line at the same time. It says lifting the rod tip straight up spends the set on picking up slack.

Not too hard. MidCurrent: there is "no need to rear back and slam that hook home," because a small hook can tear out or leave a hole that will not hold.

If the set hits the bottom, you have learned the depth. If it hits nothing, fish out the drift or cast again (editorial).

Basis: official (KDFWR); MidCurrent (MidCurrent staff, 27 August 2025)

How to rig it

The order is editorial; every figure in it is from the sections above.

1. Loop a 9 to 12 foot leader to a floating line. End it in 4X.
2. Add 2 to 3 feet of 5X fluorocarbon tippet with a double surgeon's knot.
3. Tie the heavier nymph to the tippet with an improved clinch.
4. If you are fishing two flies and the rules allow it, tie about 8 inches of 5X or 6X to the bend of the first fly and the smaller nymph to its end.
5. Put a small indicator on the leader at about 1 1/2 times the depth of the water you are fishing, measured up from the upper fly. If you cannot judge the depth, start it just below the leader-to-tippet knot, as KDFWR's Hast does, and move it down from there.
6. Fish it. If the indicator rides with the bubbles and never ticks, add one small shot about 8 inches above the upper fly, then a second if needed, before you move the indicator higher.
7. Adjust one thing at a time: depth first, then weight, then the flies.

Basis: editorial sequence of sourced components

Common problems

Basis: as named in each row

When something else is better

The tight line has a cost too. The same Orvis lesson says it needs a "smooth presentation cast" to keep contact and that you are "the one responsible for reading the current." We do not have a tight-line guide yet.

Basis: Orvis (Euro nymphing compared to indicator fishing); our dry-dropper and streamer pages; editorial where marked

In Kentucky

• Cumberland River tailwater. The best-documented indicator water in the state. KDFWR's John Hast, in the 2023 column: "A good nymph selection, including Copper Johns, Prince Nymphs and Hare's Ears in sizes 16 to 18, serves you well," with tungsten-head Prince Nymphs and the Dally's tailwater jig "in the same sizes" for swifter current, under small foam indicators, two of them with tungsten flies. In 2020 he called the Hare's Ear and the Copper John "the gold standard" there, and said "Some anglers run a zebra midge off those under a strike indicator." His leader is a 12 foot 5X with about 3 feet of tippet, on a 4-weight. That is one angler's rig on one river, printed as he gave it.
• Generation on the Cumberland. KDFWR: "One must know the electrical generation schedule from Wolf Creek Dam before fishing the Cumberland River," the schedule "is subject to change due to power demands or weather conditions," and anglers should watch for "sudden current surges that indicate unexpected generation." Hast: "One generator running is great for catching fish," because it "allows for wading while providing current that can make the fish feed a bit more." Read the current schedule and its own key for what each figure means. In winter, KDFWR says to wear neoprene waders and to avoid "wading beyond their capabilities."
• Herrington Lake tailwater, the Dix River. Hast's fall water in the 2020 column: a zebra midge under a strike indicator "in October and into November."
• Permits and limits. The trout rules on these rivers are their own, and this page states none of them. Read the water page and our rainbow trout guide before you keep a fish.

Basis: official (KDFWR columns of 26 December 2023 and 28 October 2020)

Regulations

Two nymphs under one indicator is two flies and two hooks on one line. Some waters limit the number of flies or hooks, and those rules differ by state and by water. The Orvis rig lesson's own qualifier is that it fishes two nymphs where legal. This page states no rule. For Kentucky, read the KDFWR Fishing and Boating Guide and the entry for the water you are fishing; for other states, the managing agency's page for the exact water.

Basis: Orvis on "where legal"; no regulation is stated

Kayak notes

No source we read covers indicator nymphing from a kayak, so this section is editorial.

• Watch the boat against the indicator. Drifting with the current, keep the kayak from running down onto the indicator, and mend as you would wading.
• Anchoring in current is a hazard. Hold with a stake-out pole in shallow water or tuck into an eddy; our kayak boat control page covers it.
• Two flies and shot beside the boat. Keep the rig in the water or hooked to the keeper while you handle a fish; the lob cast is easier sidearm, away from the paddle.
• Tailwaters. On the Cumberland, KDFWR's 2023 column says wade fishing is the safest option "Unless you are experienced with boating on this tricky river." Check the generation schedule before launching.

Basis: editorial; official (KDFWR) on the Cumberland

Skill level

Beginner to rig and cast, intermediate to fish well. KDFWR calls nymph fishing a good introduction to fly fishing, and Orvis says the bobber does the reading for you. What takes time is judging depth, mending without moving the indicator, and setting on a pause that looks like nothing.

Basis: official (KDFWR); Orvis; editorial on the level

What we don't know yet

• Indicator makers' own instructions. We read RIO's description of its Kahuna LT and retailers' copies of the New Zealand Strike Indicator kit description. We did not find an instruction sheet from the maker of the Thingamabobber; its attachment steps here are from the Orvis lesson. Status pending.
• A maker's depth rule. No maker page we read gives a depth rule for setting an indicator. The 1 1/2 and 2 times figures are Orvis's.
• Split shot. Four Orvis pages give four placements. We print all four; no source we read tested them against each other.
• Kentucky depths and flows. No KDFWR page we read gives indicator depths for the Cumberland or the Dix, or says how nymphing changes with one generator against two. Status pending.
• Hook-count rules. We have not stated any rule on flies or hooks per line for any water, and did not read the KDFWR guide for this page.
• Turbine numbers. KDFWR's 2023 column says "Each reading of 40 represents one turbine running"; our streamer page records a different figure in an older KDFWR column. We print neither as a rule; read the schedule's own key.

Sources and how confident we are

Section	Basis	Confidence
Leader and tippet	Orvis (two pages); KDFWR; RIO	High on the range; Orvis pages differ
Indicator types and size	Orvis; RIO; retailers	High
Two flies	Orvis	High on order; spacing differs
Split shot	Orvis (four pages)	Low: sources disagree
Depth	Orvis (three pages); KDFWR	High on 1 1/2 times
Mending and drift	Orvis	High
Hook set	MidCurrent; KDFWR	Medium: one instructional source
Kentucky waters	KDFWR	High; one angler's rig
Kayak notes	Editorial	Not tested by us

Sources

• 11. How to set up an indicator rig - Orvis Learning Center - 12 ft 4X leader, 5X fluorocarbon tippet, smallest indicator, white indicators, 1 1/2 to 2 times depth, two nymphs where legal, heavier fly first, 8 in dropper to the bend, 4 to 20 in range, jig-style lower fly, attachment alternatives, surgeon's and blood knots, shot below the lower fly, weight from the flies first.
• 12. Adding weight to your leader - Orvis Learning Center - start with small shot and add, 8 in above the upper fly, closer in fast water, up to 18 in in slow water, the indicator lagging behind the bubbles.
• 5. Types of indicators - Orvis Learning Center - the seven indicator types, how each attaches, and the presenter's view of each.
• 16. How to mend line when fishing nymphs - Orvis Learning Center - mend to the indicator without moving it, upstream and downstream mends, takes at the end of the drift, dead drift 90% of the time.
• 19. The two indicator system - Orvis Learning Center - two colors, 8 to 15 in apart, reading and mending by them.
• Euro nymphing compared to indicator fishing - Orvis Learning Center - where the indicator drags the flies up, weight and tippet, strike feel, the cast and current reading tight-line needs.
• How Do I Nymph With An Indicator, Split Shot and Multiple Flies? - Orvis - 9 ft 3X leader, 16 in of 3X and 4X to two flies, 1/2 in indicator, spreading the shot, the lob cast, "slack is evil."
• How Do I Nymph A Long, Slow Pool With An Indicator? - Orvis - 1 1/2 times depth at the drop-off, measuring depth, shot 8 to 12 in above the nymph or between flies, cast 5 to 6 ft above the drop-off, mend.
• What Is Nymph Fishing? - Orvis - the 1 1/2 times rule of thumb, sliding the indicator down to fish mid-column.
• Indicator Leader - RIO (Far Bank) - 10 ft, 6X to 2X, powerful butt and short taper for indicators, long level tip.
• Kahuna LT Strike Indicator - RIO (Far Bank) - hollow floating tube threaded on the leader, grips without damage, thin and thick, three colors.
• New Zealand Strike Indicator Wool Strike Indicator/Tool System - Feather-Craft (retailer) - the tool, tubing and wool, adjustment and removal without damage to the leader, as the retailer describes it.
• Ask MidCurrent: How Should I Set the Hook When Nymphing? - MidCurrent (27 August 2025) - set at the first sign, "hook sets are free," the downstream sweep, not too hard, what counts as a take.
• Fall Fishing Festival: Fly fishing the Cumberland tailwater - KDFWR (Lee McClellan, 26 December 2023) - the indicator described, Hast's flies and sizes, tungsten, two small foam indicators, depth from the tippet knot, 12 ft 5X leader and 3 ft tippet, 4-weight, fish near the bottom, flowing holes with cover, generation, wading, waders.
• Fall for trout all over again - KDFWR (Lee McClellan, 28 October 2020) - zebra midge under an indicator on the Dix River in October and November; Hare's Ear and Copper John on the Cumberland.
• Fishing and Boating Guide - KDFWR - where to read Kentucky's rules; not read for this page and no rule from it is stated.