She got close enough to identify and check that they were okay but the storm surf was too powerful against the cliff.
They identified the patients as an adult male with his teenaged daughter who had an injured foot.
The IRB then sat off the cliffs and kept watch while James Newell reassessed the situation from the watch tower.
The rescue helicopter was called but it was deemed too risky to try winch the patients out due to the storm surf and wind.
A second IRB was deployed with lifeguards Phil Gilmore, Sophie Couper and Clarissa Nowak aboard.
The crews waited for a slight lull when Ms Nowak was able to swim to the stranded pair and rescue the girl who was taken to Whanganui Hospital.
Lifeguards then used the same procedure to rescue the girl's father who was unharmed.
BP New Zealand managing director Debi Boffa said the coordinated response and great skills demonstrated by the lifeguards involved was outstanding.
"Since 1968 we have been proud to stand behind this amazing organisation who help save the lives of thousands of people every year as well as educate people about how to stay safe on our beaches," she says.
Wanganui Surf Life Saving Club will receive a $500 BP gift voucher to help with the costs of keeping their community safe in the water.
Lisa Smith of Surf Life Saving New Zealand said there will be an award presentation in Whanganui next week.
