CI written exam practice questions · a card
What are at least three reasons we do a roll cast?
Five from the guide: no room for an aerial back cast, to clear slack, to raise a sunk line, to free a snagged fly, and to lift a bulky fly with minimal disturbance.
The guide names five uses, among others:
- When an aerialized back cast cannot be made because of obstructions.
- To remove slack from the line — the D Loop sweep takes it out before the delivery.
- To raise a sunk line to the surface, so it can be picked up and cast again.
- When the fly is stuck on an obstacle, such as a rock, and has to be pulled free.
- To get a large blunt-faced fly airborne with minimal water disturbance — the gentlest way to lift a big dry fly or streamer off the surface.
Know the trade-off: a roll cast needs more force than an aerialized cast of the same distance, because only the line in the D Loop can be effectively energized, and it must also overcome the water “stick” of the line and leader. Cast well within your range — a roll cast is not a change-of-direction cast, and the longer the line the harder it gets.
Source
From the CI Study Guide (2025) (PDF), Task 18; see Teach a beginner the roll cast and the definition of Roll Cast.