Dear Squacks:
Normally a bit chilly this time of the year in western Pa., but as long as the water conditions are favorable, it's amazing what happens. Top water possibilities are a mite iffy, however.
Sometimes the daily movements, in streams, can put the fish in water 2 to 4 ft deep,and they are active, and they will take. Either small nymphs and wets, dead drifted, or streamers. Leadwing coachman, Zug Bug, PicKet Pin, and other Peacock type dressings, and of course Hares Ear and Pheasant Tail nymph are a good place to start. Size 12 and 14 are pretty good. Three flies spread out on the leader, each about a foot apart, covers a lot of water. Just take it easy on the cast. Since things are a bit slower now, because of the cold, soft dressing on the streamers is a good idea. Ain't nothing wrong with 2 or 3 streamers fished like wets.
Now is also the time to watch for the ice melt on lakes and ponds. If the edge of the ice can be reached from shore, this can be productive. Usually this involves pretty agressive roll casting, because of shoreline brush, so I use a single fly. While a dry might be effective in this situation, I've always used a wet.
When all else fails, use Woolly Buggers. Woodbutcher