The Bibbawarra Bore Bumpy Bridge Bison Brothers are 2 Caches either side of the Mighty Gascoyne River.
The intent of these 2 Bisons is to make you drive over the bumpy bridge that was actually built to go underwater when the river goes into flood. The drive itself is an adventure all on its own. You have to drive across the bridge for the complete experience.
What was originally a sand/gravel road created by the local plantation owners for quicker access to town saving a 35km round trip, it was often washed away and took a long time for the Shire to reinstate so in 2005 a flood proof crossing was formed to ensure year round access as long as the river is not in flood.
The Caches in question are simple bisons and you will need a pen and potentially a tool to remove the log. There is no room for swaps or anything else. Park Sign, Enjoy and move on.