Brisbane Bridge Question

[urbanlife]

Okay, lets see if anyone here can shed some light on this question, why isnt Brisbane the bridge city of Australia? One would think with the way the river winds through the city, that there would be bridges crossing it all up and down it, but instead there is a very limited number of bridges. My first guess would be that it must be a pain there if you ever have to cross the river because there is a good chance you would have to go out of your way to do it, but I could be totally wrong.

Anyone care to take a stab at this?