The bridge went down when a truck transporting a crusher tried to cross it.
The truck and machinery belongs to Covec PNG Ltd, the construction company which was awarded the multi-million-kina road project between Tambul and Mendi.
Local youth Enoch Steven said the crusher was to be offloaded just after crossing the bridge where it will be stationed for the road project.
“But it happened that the bridge collapsed together with the floater and the crusher some metres away from where it was supposed to be stationed,” said Steven.
The truck was half way over with the load when the bridge went down in the middle.
Enock said no one was injured.
He said road access to parts of Upper Kaugel and all of the Lower Kaugel constituency, and Mendi and Imbongu in Southern Highlands, was cut off.
Covec is working on a temporary passage for both vehicles and people.