Not only will you frequently find yourself with an obstacle (a tree or bush or even a cliff wall) behind you that prevents the traditional overhead fly cast, but there’s another reason it’s imperative to have a good roll cast; if the trout you’re fishing to are spooky, an overhead cast can spook the fish. Not only that, but if you’re tiring towards the end of a long fishing day, a roll cast can give you that “just one more cast” to finish out the day.
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