Principally a channel catfish river. Small guys but lots of them. I believe there is a mercury warning for them so limit consumption to recommended quantities (5 8 ounce servings a month). Rock Creek is known to hold trout but not sure of other side streams.
If you lived in state and already had a license its well worth bringing a rod and some chicken liver for a night of blackened catfish tacos. $40 for a week (non-resident) of fishing small catfish and a couple hours, at most, of trout fishing seems kind of expensive for my taste.