Jared,
Streamers, especially wooly buggers, are a good place to start. I've had bass in my pond just annihilate dry flies also. If you're fishing on a lake, usually the key is getting the fly to where the bass are. Therefore, you would need anything from a sinking line to split shot to a heavy fly or any combination depending on the depth needed.
Now if they are hitting topwater and you don't have a popper, try a sneaky pete, or maybe even a girdle bug or ***** creek, or some sort of a big dry (an adams is my favorite) or a big elk hair caddis or even a salmon fly. They aren't too picky when they are in that state.
I think the key is to not rule out a fly just because someone says it's not for bass. Hope this helps.

Ben