Gravel shelves are a very common trout stream feature but can vary in location in the stream, size, depth, and angle. These factors influence how attractive a lie it is for stream trout. We look at gravel shelves as a trout lie in this video.
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https://flyfishingvid.com/flyfishing-tips/six-basic-things-to-get-going-in-fly-fishing-getting-started-in-fly-fishing-episode-1