D-loop
Also called D loop, Dloop
The D-loop is the loop of fly line that forms behind the rod during a Spey-style cast. It loads the rod and sets the direction and safety of the forward stroke.
- Group
- Spey & two-handed casts
- Category
- Casting
- Level
- Advanced
- Water
- Freshwater
Last updated
What D-loop means
Behind the caster, the line and leader hang in a curved shape that looks like a capital D. That shape is the D-loop. It forms at the end of the sweep, as the rod tip climbs into position for the forward stroke.
In Spey and other two-handed casts, the D-loop is effectively the Spey version of a backcast. The line stays under tension, with the rod tip leading the line into a smooth, open loop behind you.
D-loop size and shape depend on rod tip path, anchor placement, line length outside the tip, and how much the line sticks to the water. A clean D-loop stays off the ground and off brush, and it lines up with the target so the forward stroke tracks straight.
Why it matters on the water
A good D-loop gives predictable rod load. Too small and the rod feels dead, the cast collapses, or the line piles. Too big and the loop drags in the grass or trees, or it swings into a place it should not be.
D-loop alignment drives accuracy and safety. If the D-loop points off to the side, the forward cast follows it and the fly tracks wide. If it forms too close to the body or crosses the casting shoulder, the fly and leader end up in the wrong place during the sweep and delivery.
Read next
- Roll castA roll cast is a fly cast made without a backcast, using the line on the water to load the rod and roll the loop forward.
- Spey rodA Spey rod is a two-handed fly rod built for Spey casting, using a long rod and a water-anchored cast to deliver flies with less backcast room.
- Switch castA Spey-style cast that sweeps the line into a D-loop with a brief touch-and-go anchor, then delivers the forward cast without an aerial backcast.
- Switch rodA switch rod is a short two-handed fly rod meant to be cast with one or two hands, often using Spey-style casts in tight quarters.