It's a funnel, but it is not a particularly great one. It's fairly wide, and it doesn't appear to terminate into anything that is likely to hold prey fish. I've got a lot of great examples of funnels, but most are on lakes I still fish a lot. I took a second here and tried to find a decent one on Fork for you. It's not the best example, but it's a little better. Note it's fairly narrow, and it terminates into some interesting structure/cover. There is an island, a point, a road bed, a couple little bays, and likely timber in the area. Add in some cabbage and this spot could be dynamite. Big fish are creatures of habit, they have small home ranges and they do basically the same things day in and day out. Funnels are just the "trail" that they take from their "bedrooms" to their "kitchens." Fishing a funnel is just a method to improve your odds of having your bait in the right spot at the right time. Not all that different then putting a deer stand next to a known trail.
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