The fundraising event will now be held at Greens Beach, this Sunday June 27.
Loaves and Fishes community partnerships manager Paul O'Rourke said continued flooding at the Gorge had left organisers with no choice but to move the event.
"We did look at alternate, local venues - the Aquatic Centre and Trevallyn Dam - but these were unavailable or unsuitable at short notice," he said.
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The Winter Solstice Splash marks one of the shortest days of the year and was originally meant to be held on June 20 before it was pushed back a week due to flooding.
With about 100 people registered to take part in the swim so far, Mr O'Rourke said he hoped the change of venue wouldn't deter people from supporting the worthwhile cause.
"Greens Beach is a great location, and in many ways it's easier, but most importantly a lot safer," he said.
"Even if it stops flooding at the Gorge, the water level is still very high.
"You can't wade in, you have to dive in. It serves a much greater risk.
"So we are hoping people will join us at Greens Beach on Sunday for what will now be an ocean dip."
A fundraising goal of $20,000 has been set for the event, to help support Loaves and Fishes to provide emergency food relief.
The food service relies mostly on donated produce which would otherwise go to waste, providing free meals across the state.
Participants have to be 18 years of age and raise at least $50, with registrations available here.
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