There has been a decent nectar flow going around the state finally. Some areas it is coming in large quantities. It is advisable to check supers to see if they are full. I have heard from some folks that the have more than 6 supers full and will be needing a ladder if they add any more. Caution must be made to stay ahead of the bees so they don't plug up the brood boxes.
If the supers are getting to high it helps to throw some of the full ones on a weaker colony so the ladder can be left at home. But beekeepers love the photo-op of a colony with 8 or 10 supers on it. I fit this group as well.
This nectar flow may last a while yet. The late spring has definitely made for a late flow. The slow build up of colonies because of the cold has been helped greatly by the late flow.