More than 10,000 megalitres of water has spilled out of Wyangala Dam over the past 48 hours.
A total of 4,270 megalitres was released from the spillway in the 24 hours to 9am on Monday and a further 5,792 megalitres has been released in the past 24 hours.
The low level bridge is currently closed, with water flowing freely over it.
NSW Water Commissioner, David Harriss, says the current environmental flow releases from Wyangala Dam were being triggered for the first time in 10 years and showed that the river was returning to its natural flow regime following the recent devastating drought.
Mr Harriss said that the releases were consistent with community-established rules in NSW water sharing plan for the Lachlan River.
"The adaptive water management system in NSW allows us to manage water to meet critical human and industrial needs during times of severe water shortages, such as the recent extended drought," Mr Harriss said.
"Now that the drought has broken, this approach to water management allows us to maintain the productivity of the river system through the release of these 'translucent flows'."
Mr Harriss said that a "translucent flow" is where a proportion of natural inflow to storage is passed downstream rather than being captured for later use.
"In the Lachlan Valley, water releases would typically be made in winter and spring. Inflows to Wyangala dam since January 1 this year have exceeded 250 gigalitres - approximately one fifth of the total storage capacity."
"Wyangala dam is currently around 95 per cent capacity because of high summer inflows and the translucent release, the first in ten years, will mimic natural flows in the river."
"Under the rules in the water sharing plan, translucent flows can continue up to November 15."
"In this release a flow below Brewster Weir of over 6,000 megalitres per day is currently being targeted," Mr Harriss said.
Wyangala Dam is currently at 95.8 per cent capacity.