When most rivers start raging chocolate milk from runoff, the best place to fish is Warm River. Since it is mostly spring fed and a shorter river, it doesn't get hammered with the dirty water like almost every other river and stream in the Ashton area. Having said that, the 2012 winter was wimpy and runoff may be earlier and more mild than last year.
Fishing Warm River this time of year is what you would expect for spring time. Until the Stone Flies start hatching, which will most likely be a week or two earlier this year, but don't quote me, fishing deep is your best bet. Use a black rubberleg with small beadhead dropper. Of course I have heard reports of a caddis hatch in the evening, so be prepared for any situation.