The water temp is around 35 degrees right now and will probably just get colder as the winter progresses. Maybe if you can find some deeep water you might catch something but Ft. Armistead is very shallow. I tried fishing there in March a few years and once I caught a small brown catfish. It didn't even fight at all it was so cold. I hear people catch yellow perch in the winter though. Wish I knew where to tell you to try because I'd go there myself.
The Outdoor Channel is playing fishing shows on Saturdays again. That's how I got my fix last weekend