Posted on Monday Apr 1, 2013 at 11:06 AM
I am not sure what the structure is below the bridge, but it is likely just some water release infrastructure or some form of water supply structure for OKC water lines. But even thought we may not know what it is, I can give you a good idea of why the fish are there. Fish actively seek moving water to feed because the food there is usually pretty easy to catch and eat. Tailwater fish (living below a dam) thrive when water is released beause the moving water also brings food right to them. The spot you are talking about might be a perfect funnel area where predators can find food moving into a confined area, which makes for an easy meal.