A piled or crashed anchor is an anchor that lands on the water creating slack in the fly line or leader. The line does not lie straight and taut from the rod tip to the fly; it arrives with extra line and the anchor collapses into a heap.

The definition names a layout fault, and that is how to use it. The anchor is the fly and the line or leader in contact with the water at the bottom of the D loop, and its layout is what the delivery has to work with. When the anchor is piled, the problem is in how it landed, not in how hard you are throwing the forward cast.

That order matters in diagnosis. Identify the anchor layout first, then decide about delivery force. Adding force to a piled anchor treats the wrong end of the fault.

In a lesson, have the student watch the anchor land before the forward cast, not the loop in the air. A pile is visible as a heap of line, and it tells you to look at the sweep and the placement that produced it rather than at the delivery.

Source

From the FFI Fly Casting Definitions (August 2025); terms follow the FFI Fly Casting Definitions (Piled/Crashed Anchor).