Boat ramps are fine. Bridges can be hit or miss just like any fishing spot. I would look at going down to the dam area and looking at the various humps , ledges , and drop offs. Lots of them in that area that have deep water around them. If your grandson is old enough , you could also try casting rat-l-traps to the lighted docks. Some hold more and better fish than others , and some do not hold any fish at all. Good luck !!!