A massive dam was required to control the flow of water of this even more massive river.
There are also generators installed inside to generate electricity from the water that goes through it. Despite being such a large technical structure, it can run completely without crew and there is usually nobody in the area, leaving automated systems to take care of everything.
Despite being not very clean, it's a very popular way to travel (by foot) to the other side of the river.
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I imagine the map is to be played to get from one side to the other, maybe in a chase or a pursuit of someone trying to flee. The stairs could maybe be used to travel from one section to the other without going over the exposed part in the middle.
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