Hopes of finding a missing eight-year-old boy alive are fading as the search near Walpole enters its fourth day.
Police divers returned to the river near Fernhook Falls on Wednesday hoping to locate the boy.
He was last seen at his family's campsite on Sunday morning.
Police have confirmed his clothes were found near the river shortly after he disappeared but there has been no sign of him since.
Inspector Glenn Spencer said the land search was called off on Tuesday afternoon.
"The search on the land was based on if the boy had self rescued," Inspector Spencer said.
"SES have searched 600 metres either side of the bank and about a kilometre downstream, and they've maximised every opportunity we've had to locate the boy on land."
Conditions in the river have proved to be challenging for police divers and visibility is extremely limited.
"The water is very high flowing and there's lots of obstructions ... very turbulent water, very tumultuous ground," Inspector Spencer said.
"Lots of rocks, lots of logs, and very low visibility of 30 centimetres, so it is hands and knees searching."
Inspector Spencer said the boy's family are in the 'grieving process' as they come to terms with the fact he may not be found alive.
Police issue 31,000 driving infringements in first month of new AI cameras
Works underway on Rockingham and Safety Bay High School redevelopments
New measles exposure sites revealed in Bunbury
Dawesville man charged after allegedly leaving his elderly Great Dane to suffer painful conditions
Good Samaritan sought by police after helping teen during robbery in Baldivis
Under-16s social media ban now in force
Desperate search continues for missing Bunbury FIFO worker
Passengers now able to use credit, debit cards to tag on and off WA's public transport
New floating jetty speeds up emergency response times for Marine Rescue Mandurah