There's a reason why I've avoided the 116th St. stairs in Morningside Park these past couple of months.
There are two tiny seeps on either side of the vertical stone in the top photo. Those seeps, along with the tiny waterfall, are enough to make the landing and steps below 116th Street a treacherous mess. Sheets of black ice form at the edges of the two streams. The safest, but wettest, passage is to walk through the fastest moving water. The Parks Dept. needs to work on the drainage here but I doubt that's going to happen anytime soon.
Anyway, what I really wanted to show is this video of water flowing underneath the ice: