It has a length of 259 kilometres (161 mi) and extends in northeast-southwest direction from Bowen on the east coast of Australia to the Gregory Developmental Road in Belyando near Nairana National Park.

[6] State Route 77 departs from the Bruce Highway in a southerly direction, just west of Bowen.

The road generally follows the route of the railway line to a point south of Collinsville, where the railway continues south to coal mines and the road turns south-west, passing through the locality of Mount Coolon, where the Suttor Developmental Road branches off to the south.

The project for progressive sealing and minor drainage improvements was completed in early 2021 at a total cost of $28.8 million.

[7] A project to pave and seal a further section of the road, at a cost of $15 million, was completed in late 2021.