So you want a bridge that raises so big boats can fit underneath, but you want it to look like every other bridge. Check out what they did in England:
http://www.youtube.com/watch?v=q54VKT_mZfI (http://www.youtube.com/watch?v=q54VKT_mZfI)
The construction is just as interesting!
http://www.youtube.com/watch?v=_JwSx3MJ718