Working on the project is cracking ahead at a quick pace.

A Transport for NSW spokesperson said all 10 temporary casting yard piles are complete.

"Construction of the casting yard, where the bridge segments will be built before pushing them out over the Shoalhaven River, is well under way," the spokesperson said.

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Concrete has been poured within 11 of 19 steel casings for the piles, which have been installed on the temporary rock platform.

Each pile requires around 45 cubic metres of concrete, equivalent to eight concrete trucks.

"Mobilisation of marine machinery has begun and piling from barges in the Shoalhaven River will start from April, weather permitting," the spokesperson said.

"Pedestrians and cyclists continue to be detoured onto the southbound bridge footpath during high noise activities associated with piling.

Around 25,000 tonne of rock has been excavated next to Illaroo Road to allow for the widening and lowering of the upgraded road.

"This material is being processed on site at Bolong Road and will be re-used on the project," the spokesperson said.

Fill has been placed near Bomaderry Creek to enable the widening of the highway on the western side.

"This area now needs to go through a settlement and consolidation phase of up to nine months ahead of the next stage of work," the spokesperson said.

"Stormwater drains are being installed and utility services continue to be relocated across the site.

"Earthwork is also continuing for the new local road connecting the highway with Lyrebird Drive."

The project is on track to be completed in mid-2024, weather permitting.