Four people, including a child, were dumped into the Whanganui River when a boat overturned.
The 5m aluminium boat capsized near Q-West Boat Builders in Gilberd St on Sunday afternoon.
"They were trying a tight turn and it just kept going," Coastguard Wanganui president Garry Hawkins said.
All four in the boat were wearing lifejackets. They were picked up by another nearby vessel and taken to the wharf.
Coastguard had an ambulance at the wharf waiting to check them out.