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thank you for the replies.
Going for trout.
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There are several different ways/types of trout fishing that can/will dictate the right rod weight, line, fly, etc.
For instance, larger dam tailwater rivers generally have larger fish and larger water dictating a heavier rod weight. The type of fly you throw will also dictate this as well. Large streamers and nymphs demand heavier lines to turn them over properly. Lighter, smaller flies such as most dry flies do not need such a heavy line. On the other hand, smaller blueline streams demand sometimes shorter and lighter rods. In other words, it all depends.
Being as descriptive as you can as to the type and size of water and type and size of fish and type and size of your fly will greatly help.
As an example, I fish primarily for trout, but I have rods from a 2 weight to a 7 weight and 7'6" to 10'. All depending on where I go and what conditions and fish size is along with fly used.