The bridge is pretty delapidated, go on it at your own risk!
Stealth required as this is a public thoroughfare, and the bridge is next to a house (although you can remain out of view when looking for the cache). There are also some industrial units here with plenty of comings and goings.
The cache itself is not on the bridge. The GPS signal was flaky and kept putting us about 4 metres out, but the clue will help. Please make sure the cache remains out of view.
GZ isn't the nicest area, it gets used for dumping rubbish which is a shame. You do not have to go near the rubbish for the cache or put your hand anywhere near rubbish.