To be absolutely clear: people have died here, on more than on occasion. It's like the whole place was designed to be The Last Water Slide You Ever Ride or something. There is nothing stopping you from falling off of these steps and onto slick rock and sliding all the way to the bottom besides your own balance.
apparently if you jump into it, you'll get sucked to the bottom by a powerful drain that will keep you down there until you drown. this is known because it's happened to people. the city's response has always been "well don't do that."