Right now is prime time night fishing for multispecies at a dam spillway near you. I wrote about a month and a half ago in regards to fishing lighted areas and fishing for white bass at night. This is a multi-faceted technique that is Guranteed to put you in lots of fish if you are willing to forgo a few hours sleep. What you will be dealing is fishing the dam spillway itself. Not just any part of it, but the lighted areas of it.
Most dams typically have some sort of lights that cast luminescence upon the water.
This is like throwing a spotlight on the water all night. Predatory fish get below minnows and other baitfish milling around just beneath the surface and looking up see thousands of silhouettes of easy food. The action never seems to stop for very long. The shaded areas at the fringes cast by the lights hold the most action and biggest fish. See diagram below.