A MULTI-million-dollar bridge replacement between Gayndah and Mundubbera will be officially opened on Wednesday.

Queensland Minister for Transport and Main Roads Mark Bailey said the Queensland Government had provided a further $2.2 million through its Building our Regions program for the Deep Creek Bridge replacement.

"This upgrade is a critical investment in better access to market for the local citrus and cattle producers, improved safety and increased flood immunity,” Mr Bailey said.

North Burnett Regional Council Mayor Rachel Chambers said North Burnett businesses and residents had benefited from the project's support requirements through purchases such as concrete, gravel, fuel, plant equipment usage and servicing, accommodation, food and labour.

"This project was truly a regional commitment thus ensuring monies spent stayed in local pockets wherever possible,” Cr Chambers said.

Federal Member for Flynn Ken O'Dowd said the new two-lane concrete-deck bridge replaced the old single-lane crossing.

"The new bridge is designed to accommodate heavy vehicle loading, providing access to heavy vehicles, which in turn has resulted in an increase in transport productivity,” Mr O'Dowd said.

Deputy Prime Minister and Minister for Infrastructure, Transport and Regional Development Michael McCormack said under our Bridges Renewal Program, we are funding crucial upgrades nationwide to support community access and freight productivity in the form of better and safer bridges.

The Australian and Queensland Governments each committed $2.2 million toward the new bridge.