Lower Hudson
As of 6PM the night before, there were 8 people signed up for the trip - but, one by one, most came to their senses and backed out, so only three boats actually went on the water. The day was cold, around 50 degrees, and the rain was steady for the time while driving over to New York, although it did stop for most of the on-water time. And, there was no water to speak of in the river, only 3.1' at North Creek. We shortened the trip to be just Riparius to the Glen Bridge, to keep down the abuse to the boats. At this level, most of the trip was just trying to avoid hitting too many rocks on the river bottom, not really whitewater. At the major 'rapids', the goal became to follow the main channel of water as it twisted among the boulders. I think you need to have a level of at least 3.5 - 4.0 feet to have a decent trip.
At the end of the trip, we got an extra surprise, in that the usual takeout on the right (west) shore just below the Glen Bridge was posted and blockaded. We were able to take out about a hundred yards above the bridge on the east shore, where there is a big parking area.