The RACQ LifeFlight Rescue helicopter airlifted a man and a six year old boy with injuries including fractures and lacerations to Mount Isa Hospital in a stable condition.
The search continues for a nine year old boy.
The lake is a popular spot for weekend campers and boaties
The RACQ LifeFlight Rescue helicopter returned to search for the boy but was stood down at 2.30pm.
It is believed QPS and the SES are continuing the search.