Elderberries are edible, & can be made into jam, pies, & wine. Raw elderberries can slightly bother some people's stomachs. I have no problem with them. There weren't very many of them left in Government Canyon.
Try a higher elevation, like up on Blue Ridge.
Currants are edible raw & are used in baked goods, chutney, salads, jam, juice, jelly, & as glazes. I haven't seen weren't too many of them where I have looked.
Chokecherries are tart raw & have a big pit. The pits & leaves contain hydrocyanic acid, which is removed through boiling. Jam, wine, & syrup can be made from them. There are tons of chokecherries along the dirt road between Highway 2 & Government Canyon, as well as a whole lot right along Highway 2, and they're very easy to pick.
I don't know anything about the snowberry. Are they edible?