Over the last 20 years of streamer fishing I’ve encountered many different situations.
I’ve fished fast Western rivers, Southern tailwaters with variations of speed based on dam flows, and slow Midwestern streams and lakes.
One of the most important factors I have found to maximize fly action is having the correct weight for each situation.
Flies swim differently depending on the amount of weight added and the materials used to counteract that weight.
I frequently tie a fly pattern in a variety of weights.
The general rule is the less the speed of current, the less weight is needed on your fly.
Flymen Fishing Company
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https://flyfishing-blog.com/flyfishing-blog.com/2021/12/09/flymen-fly-outpost-free-guide-four-reasons-to-ditch-the-indicator/
https://flyfishing-blog.com/flyfishing-blog.com/2021/12/02/flymen-fishing-co-robin-phillips-golden-nugget-2/