Dredging of Bermagui's harbour and river has begun, to clear navigation channels of sand that has accumulated over time and restricted boating access.
The work, funded by $1.2million from the NSW government, is expected to finish in July and will remove over 30,000 cubic metres of excess sand.
A Department of Planning, Industry and Environment (DPIE) - Crown Lands spokesperson said about 22,500 cubic metres of clean marine sand will be removed from the main navigation channels at the river and deposited at Horseshoe Bay Beach and Morehead Beach to help replenish the beaches from the effects of erosion.
"Sand when first dredged is often darker in colour than beach sand that has been bleached by the sun," they said.
"The sand's colour will change and become lighter over time.
"While water quality is not affected, swimmers are advised to avoid areas near where dredging machinery is operating to ensure their safety."
Also, 7600m3 of sand will be dredged from the harbour entrance, cleaned and stockpiled for potential future use.
"All debris and contaminated material that is extracted from the harbour will be disposed at an authorised waste facility," the spokesperson said.
They said a review of environmental factors had been completed to ensure there would not be any significant environmental impacts to the river and beaches' ecosystems from the dredging operation.
"A strict water quality management plan is being implemented to ensure the waterways are protected," the spokesperson said.
"The dredging project will also involve removal and disposal of marine debris and contamination to improve the health of the local ecosystem."
Last month, Member for Bega Andrew Constance said the waterway was affected by sand accumulating over time that can restrict boating access and required occasional dredging.
"This work will ensure continued access through the waterways and to local maritime infrastructure for commercial and recreational boaters," he said.
The dredging work is being undertaken by Sandpiper Dredging Pty Ltd following tenders that were called by the DPIE.
Bermagui's harbour was dredged in 2003.