Even though I grew up, lived and worked in Brissy for years I've never photogrpahed the Story Bridge.
I would suggest you do a walk to get the whole picture, what you do is walk along the top of the cliffs at Kangaroo Point, across the bridge, back along the waterfront on the city side, to the goodwill bridge just past where the Riverside Expressway crosses the river, to South Bank and again back to Kangaroo Point.
There are many many angles you can shoot. And that is not considering the angles from New Farm shooting back towards the bridge (harder to get to since the flood washed away the Riverwalk)......
Can I suggest you also go for a walk and suss it out on the 15th if your schedule allows, and shoot what you can as well, as it is easy for bad weatehr to stuff your opportunity right up if you wait to the end.
Equally - if you can do it, go for an early walk and try morning shots..... but I know when I get away for work, there is NO way I'm gunna get up for a 6am photo walk, after generally drinking huge amounts until midnight. Marble Bar at the Sydney Hilton is proof of that, and I still had another day of tax conference after last drinks were called
In preparation, have a look around the internet at some of the posted shots...... I know that on
http://forums.overlander.com.au/viewforum.php?f=20 there have been quite a lot of good angles of the bridge posted over the years, often with a comment as to where from.