It should definitely be raised somehow to be more accommodating for figs. Just my outsider opinion.
I did try raising the bridge one more level, but those column positions in their original configuration are very obstructing for placing figures in and out. My proposed column configuration provides more space. If you did add a Marvel set to the build requirements, you could add to the bridge height by doing some double-high stacking (making the climb up a level 3 move instead of 2). Almost all of the road pieces were used in the construction.
Edit: Moving the 7-hex pieces back a bit and allowing more room under the bridge might be an option as well. Since the center of the bridge uses the 5-hex bridge pieces, you do have room that still keeps the bridge stable.