The Cullen River in the northwest of the Northern Territory starts at an elevation of 182m and ends at an elevation of 111m merging with the Fergusson River. The Cullen River drops around 71.1m over its 47.3km length.
After merging with the Fergusson it eventually flows into the Daly River. I imagine there was much excitement when this "bridge" was first put over the river but the height of the new bridge will give you some idea how inadequate it would have been.
The cache is a small screw top container. This is only accessible if you are travelling North. You can access the old Stuart highway at weigh point 1 S 14 02.064 E 131 56.761 if you are adventurous, but waypoint 2 at S 14 01.926 E 131 56.570 is easier and has plenty of room to pull off with a RV.
Have fun.
Congratulations Grey Team FTF