UPDATE 10.48am: Two cranes have been deployed to the Peak Downs Highway after a truck lost its load near the Stockyard Creek Bridge, Epsom about 7am.
Nebo Senior Constable Andrew Perrett said the bucket had been dislodged from the truck falling across both lanes of the highway.
Nebo police have requested all light vehicles travelling east divert at Oxford Downs Sarina Road.
Heavy vehicles unable to travel the Sarina Range should seek alternative routes.
A police spokesman said trucks would be unable to turn around and were stuck at the location while diversion for smaller vehicles to turn around were in place at Sutter Development Road.