Rockhampton Regional Council crews will carry out roadworks to pave the way for the $352 million Rookwood Weir project, 60km south-west of Rockhampton.
A request for offer has been made to the council to undertake the $6.5 million upgrade of Thirsty Creek Rd.
The upgrade will involve the widening of a 16.2km section of Thirsty Creek Rd, ensuring the local road network can safely accommodate heavy earthmoving vehicles for weir construction.
The council and Sunwater are expected to sign the contract in late-August to start the work so that gravel can be crushed in time for work to begin as soon as possible.
The major contract for construction of the weir will be released to the market later this year for expressions of interest, with a contract awarded in mid-2020.
Sunwater chief executive officer Nicole Hollows told a Parliamentary Estimates Committee hearing on Wednesday that final design had been completed for the road upgrade and bridges, as well as 85 per cent of the design for the weir.
The bridges will allow for increased flood immunity and reliability of access across the Fitzroy River.