The Paroo River reached historic heights today, Monday 7 April, after surpassing the previous record of 4.9 metres in the 1990 flood event by 40 centimetres.

The Paroo River peaked at 5.3 metres on Monday 7 April morning.

Wanaaring received a 'prepare to evacuate' order should the situation escalate. 

The town of 47 residents is now fully isolated and would require NSW State Emergency Services (SES) assistance to leave the township via aircraft. 

The Paroo River is expected to remain well above the major flood level for the next few days.

 The only way out of Wanaaring currently is via air. Photo: NSW SES

A NSW SES spokesperson said an estimated 350 people in western NSW could be isolated due to the recent flooding. 

"We've got numerous flood rescue teams in place and many assets that are mobilized and we're working directly with the community to make sure they're informed," a NSW SES spokesperson said.  

In the following days and weeks, the flood waters are expected to move downstream into the Darling system and eventually the Menindee Lakes.

"Floodwater across western NSW does move slowly due to the typography of the land," NSW SES Western Zone Deputy Incident Controller Annabelle Watson said. 

"Extended isolations of six to ten weeks will limit access to essential services and supplies. Those who choose to stay could face power outages and loss of communication."

A watch and act notice for Walgett, Lightning Ridge, and surrounding areas continues to remain in place as well. 

Properties in Bourke and Walgett were also isolated due to the high flood waters. 

"We have aviation asses positioned in Bourke and Walgett, high clearance vehicles at Bourke and Wanaaring, and additional vessel and general purpose vehicles to make sure we can respond to communities in a timely manner," Superintendent Watson said. 

"We want the community to prepare now to isolate for an extended period of time, evaluate their own risk, and move early if they need to.

"The ability to leave by vehicle is rapidly changing and roads could close at short notice." 

Anyone in the area is strongly advised to not enter floodwaters and call the NSW SES on 132 500 if you require assistance.