So I don’t have any noticeable progress on the bridge yet, but I wanted to talk about, as the title says, how to make an object curve. As far as I know, there are two ways you can do this. The first, and also the easiest, is only useful if you want a very simple curve in only one direction. For this method, you just use simple deform, and set it to bend. After you’ve done that, I would recommend setting an origin, because that gives you more control over how the bridge bends.
The other method is by using the curve modifier. Many people prefer this because it gives them more control over the curve their object follows. To do this, create the type of curve that fits with the way you want your object to curve (Bezier, Circle, Nurbs, etc.), make the curve the same size as the object you want to be curved, then place the curve over the object. Then, you select the object you want to be curved, go to the modifiers panel, and select the curve modifier. This was much more difficult for me to use, but after some tweaking, you can usually get it to cooperate. If you have any questions, please feel free to comment below.