A swimming event next month is expected to bring more than $1 million into Murray Bridge's economy.
Murray Bridge Swimming Centre will be awash with visitors this Sunday for the local club's annual carnival, but after that its sights will be set on January 9-12: the Swimming SA Country Championships.
The only state championship meet to be held outside Adelaide rotates to a different destination each year, and in 2020 it will be Murray Bridge's turn.
About 500 competitors from 35 country swimming clubs are expected to take part, supported by another 2000 volunteers, friends, family members and spectators.
Unlike the other three major state events, qualifying times will be relaxed to allow the greatest possible number of people to take part.
Organising committee chair Craig Kemp described what lay ahead as "massively exciting".
"It's a real spectacle, a fantastic event to watch, and we expect a lot of public to come and watch," he said at the Murray Bridge council's November meeting.
"Pretty much everyone coming in will be buying four days' accommodation, buying meals in pubs, cafes and delis - all those businesses will benefit."
Mr Kemp sought and received from the council help with some of the logistics, including fencing, traffic management, toilets, catering and printing, with the blessing of Mayor Brenton Lewis.
"We know the massive benefit the carnival brings to the area," Mr Lewis said.
"It's a great healthy sport for kids."
As with this Sunday's carnival, the swimming pool will be unavailable for public use throughout the event.