"Just a couple of us decided we'd come down and give it a try, a bit of fun."
His clubmate and nationally-ranked swimmer Laura O'Keeffe was third overall and well ahead of the rest of the women's field with a 37 minute finish.
"It was good fun, something different," she said.
"I did one ocean swim a Splash 'n Dash in New Plymouth but this is really good."
The swimming club members are currently training for a number of meetings, which for O'Keeffe will be national events in Auckland and Wellington in April.
"That's the main focus getting the speed up for that," she said.
Conditions varied on the river during the racing after showers were replaced with muggy temperatures.
In the 1km short course, there were eight male and 13 female entrants.
The ladies were the fastest, taking out the first seven overall placings.
Next on the calender for the multisport club is helping run the AFFCO Triathlon this coming Saturday, 2.30pm at Lake Wiritoa.