Both.
Some ramps were/are closed to low water. Small boats don't/didn't have problems with launching on the ones that were open. Larger trailers will run off the end of the slab. No problems launching, just when you wanted to get your boat back on the trailer.
Some members here can tell you about having to get out and push their boats off of bars.
Best bet now is Sardis, Enid or Grenada. Still keep a watch on low water conditions.