"There will be 400 metres of pipe in the river with kayakers at each end to make sure the ducks stay on course," he says.
He has also attached a lead-filled bottle top to the bottom of each duck to ensure they stay upright in the water.
All the ducks are safely removed from the river after the race to be washed and stored for the next one.
"No duck left behind is the hashtag," says Goldsworthy.
The front window of Plumber Dan's shop on Victoria Ave is currently filled with yellow quackers ready for release.
Jigsaw administrator Rachel Doble says the funds raised from the race enable the service to help pay a social worker's salary.
"We want to keep a full team and we don't want our valuable staff getting burnt out because they provide an essential service for Whanganui."
Tickets are available from Jigsaw, Plumber Dan, Caltex on Victoria Ave, Vets on Carlton or from the River Markets on Saturday. The Duck Race begins at 11am on Saturday.