I do not have any specfic details of the murray river bridge but the enginners of the day were well aware of the absolute requirement of getting the foundations into something quite solid. Even before the time of construction of this bridge test boring to make sure there was something substantal below ground was done before the position was finalised. It has been there for 130 years or so and on close inspection it does not appear to be moving at all.
I will see if can find out anything on the building of the bridge. There is a rumor around that they are planning to build a double track bridge next to it. The current bridge only has a single train limit, previously the signalling for the BG and the SG on the bridge was interlocked so only one train could be in the section at a time.
The Murray has changed a fair bit over the years it was desnag quite some time ago this resulted in the river getting much wider and much shallower making navigation of the river by any craft of a decent size really problematical. According to a number of paddle steamer skippers I have talked to the average depth of the river is now less then 1.8 metres.
Note: I live in the area and have a real passion for bridges, this example, the Redesdale bridge, the chandler hwy bridge at Alphington being some of the more intersting examples of early Aus bridges. Also not forgetting the pratt truss over the goulburn at Murchison. While we are on the subject can not leave with out mentioning the railway bridge at Murray bridge really well worth an inspection.
I would really love a good look at the Forth bridge ........... ssssiiiiggghhhhh
Woodford
ps, there has been plenty of ARTC, SIA, O'Donnel and Griifen and John holland vehicles travelling up and down the Hume freeway the past few days. must be some thing in the wind, also seen two VLine vehicles.