The ute and the man inside was located in a creek off the Gregory Highway in Hibernia, west of Rockhampton in central Queensland.
A member of the public found the man in his ute around 7am this morning, and immediately called police.
A police spokesperson said the man was the only one in the vehicle and he was located dead at the scene.
They confirmed police and emergency services were in the process of retrieving the vehicle, but that wet weather was impacting the retrieval process.
“Recovery of the vehicle may take some time due to the location and current weather conditions,” police said in a statement.
Residents in affected areas have been reminded by authorities to not drive through floodwaters.
Police said it was unclear how the ute ended up in the water, with investigations continuing to determine how the man died.
They added it was unclear whether the man and ute had crashed prior to being swept into the floods.
The forensic crash unit will investigate the incident further. Any witnesses who saw a white Toyota Landcruiser ute travelling along the Gregory Highway overnight have been urged to come forward.
The man is yet to be formally identified.