The reconstruction of the intersection of Chloride and Williams Streets has reached the half way point.

The major road works, which are being completed by Council on behalf of NSW Roads and Maritime Services, have been significantly hampered by weather events and unstable ground.

"The early stages of the project including excavation were going quite well, however the work site was flooded on two occasions due to rain, which slowed us down significantly while we pumped the water out," said Council's Chief Operations Officer, Anthony Misagh.

Mr Misagh said the excavation also uncovered weak soil under the original intersection.

"This weak soil probably accelerated the breakdown of the original intersection, so we have had to clear 230 tonnes of that soil away and replace it with road base and geofabric," he said.

"Again this has added to construction time, but should significantly improve the longevity of the new intersection."

All concrete on the northern side of Williams Street has been poured and will be left to cure for one week.

Crews will then close the southern lane for construction, and reopen the northern lane for traffic.

Traffic lights and other traffic controls will remain in place for the duration of the project.

"We realise this work is an inconvenience, and we'd just like to thank everyone for their patience and careful driving while this work is being carried out.

"We expect to have all work completed by October 5."