The Macrossan Bridge is a pretty impressive bridge. Looking over the side it is hard to imagine that water completely submerges this structure during some wet seasons. At one of my parking waypoints you can see the heights achieved since the mid to late 1800's
https://m.youtube.com/watch?v=CDves73oxGg
if you clicked the link you will see how high it was on 6th February 2019
I've thrown a cache around here somewhere
To find it project a waypoint from the posted coordinates at a bearing of 271.36' for a distance of 547m
there is no need to walk on the highway for any reason. Have fun