By Spencer HollisFly fishing relies on the weight of the line, not a lure, to carry the fly to the fish. The Orvis glossary describes fly line as a tapered plastic coating over a braided Dacron or nylon core, available in floating, sinking and sink-tip styles. The Minnesota Department of Natural Resources adds that a clear monofilament leader connects the line to the fly; it is less visible to fish than the fly line and, because it is lighter, splashes less on the water.
How Fly Line Weight Works
Fly lines are rated by weight, not by breaking strength. The Orvis fly fishing glossary defines line weight as the weight, measured in grains, of the first 30 feet of a fly line. This standard lets anglers match a line to a fly rod’s stiffness. A 5-weight rod, for example, is designed to cast a 5-weight line. Orvis calls the bend that the line’s weight puts in the rod during the cast “loading the rod.”
Matching Line Weight to Your Rod
Orvis’s guide to choosing a fly line states that the best starting point is to know the line weight the rod was designed to cast. A 5WT rod pairs with a 5WT line. However, the guide also notes that you can cast a 6WT line on a 5WT rod if it matches your casting stroke better. Trying different lines on your rod can help you find what feels most accurate and effortless. The Minnesota DNR’s fly-fishing basics publication recommends starting with a mid-weight rod (5 or 6 weight) and a fly line of the same weight. A properly matched rod, reel, and line makes casting easier and more enjoyable.
Fly Line Tapers: Weight Forward and Double Taper
The taper describes how the line’s thickness changes along its length. According to the Orvis glossary, a weight-forward (WF) line carries most of its weight in the forward section. It quickly tapers down to a fine-diameter running line that shoots through the rod guides with less resistance for added distance. The glossary calls WF the most versatile fly line. A double-taper (DT) line has both ends tapered, with a level belly in the middle. The glossary says DT lines are excellent for short or moderate-length casts and for roll casting, but they are not as well suited for distance casts. Both tapers are available in floating and sinking styles.
Floating, Sinking, and Sink-Tip Lines
Orvis’s fly line guide breaks down the three main line types. The table below summarizes how each behaves and where it is typically used.
| Line Type | How It Behaves | Typical Use |
|---|---|---|
| Floating | Designed to float on the water, keeping flies on the surface or high in the water column and reducing drag. | Dry flies, emergers, and nymphs; extremely versatile for many situations. |
| Sinking | The entire length sinks at a specific rate, rated in inches per second (IPS). | Still water like lakes; getting flies down deep when fish are not near the surface. |
| Sink-Tip | A floating running line with a weighted sinking section at the leader end. The tip sinks while the rest stays on the surface. | River fishing with streamers, especially in fast, heavy water where you need to get the fly down while avoiding snags. |
The Orvis guide adds that other subtypes exist, such as Skagit or Spey lines built for two-handed casting, and tactical or Euro nymph lines that are thin to reduce snags and improve sensitivity. For most beginners, a floating weight-forward line matched to the rod weight handles nearly all fishing.
Backing, Leaders, and Tippets
A complete fly line system includes backing, the fly line itself, a leader, and tippet. The Orvis glossary describes backing as braided Dacron line that fills the spool before the fly line is attached. On larger reels for salmon, steelhead, or saltwater species, backing also plays a role in fighting fish. The Minnesota DNR publication explains that a clear monofilament leader connects the fly line to the fly. The leader is tapered: thicker where it attaches to the fly line and thinner at the fly end. The thinnest section is called the tippet. As you change flies and the tippet gets shorter, you can tie on fresh tippet material. A proper leader and tippet setup helps present the fly naturally and reduces splash.
Choosing a First Line for Trout or Bass
The Minnesota DNR suggests starting with a mid-weight (5 or 6 weight) fly rod, a matching weight-forward floating line, and a leader. Orvis’s guide confirms that a floating WF5 line on a 5WT rod will handle almost all the fishing you do. For trout in streams and lakes, a floating line lets you fish dry flies, nymphs, and even small streamers with added weight. If you plan to fish streamers deep in rivers, a sink-tip line can help get the fly down while keeping the running line on the surface. For bass, the DNR notes that smallmouth feed on crayfish and small fish, so streamers or crayfish flies fished on a floating line or a sink-tip can be effective. A trout fly setup and a bass fly setup share many basics, but the line choice may shift depending on water depth and fly type.
Fishing regulations, including license requirements, gear restrictions, and size and bag limits, vary by state and body of water. Always check your state wildlife agency’s rules before heading out.
Frequently asked questions
What weight fly line should a beginner start with?
The Minnesota DNR recommends a 5 or 6 weight line matched to a rod of the same weight. Orvis’s guide says a floating, weight-forward 5-weight line on a 5WT rod handles almost all fishing situations a beginner will encounter.
What is the difference between weight-forward and double-taper fly lines?
According to the Orvis glossary, a weight-forward line concentrates its mass in the front section, making it easier to cast for distance and very versatile. A double-taper line has both ends tapered and a level belly, which excels at short to moderate casts and roll casting but is less suited for long-distance work.
Do I need a sinking line for trout fishing?
Orvis’s guide states that a floating line is the most common choice and works for dry flies, emergers, and nymphs. A sink-tip line can be useful when fishing streamers in rivers, especially in fast, heavy water, because it gets the fly down while the floating running line stays on the surface and avoids snags.
Explore more fly line options and guides to find the right setup for your fishing.
Sources
- Orvis: How Do I Choose a Fly Fishing Line?
- Orvis Fly Fishing Glossary
- Minnesota DNR: Minnesota Fly-Fishing Basics
About Spencer Hollis
Spencer puts together our beginner & family fishing guides, digging through specifications, manufacturer details and owner reviews so you don't have to.
