Pay close attention to Theo's warning. New dams need time to settle. The spillway is there for a reason and shouldn't be obstructed in any way. For the most part, fish try to travel upstream. Yeah, you might lose a couple of your new babies, but it shouldn't be a real problem.

If you get some grass carp, they will try to escape downstream. They are about the only ones that could be a problem. Especially at $15 each. BTW, when do you expect to get enough rain to be a problem? Most spillways can be considered pretty low mileage and I figured the hill country was about as dry as the rest of the state.