The NSW State Emergency Services (SES) has today issued flood advice for Bourke and Brewarrina as floodwater from southern Queensland continues to head south. 

The Barwon River's flood peak in Walgett on Saturday 12 April may cause minor flooding in Brewarrina around Friday, according to the SES. 

The Barwon River at Brewarrina is currently at 4.75 metres and is expected to rise to the minor flood level of 6.4 metres by then. 

Minor flooding may develop along the Barwon and Darling Rivers downstream of Brewarrina to Bourke from Thursday as inflows from the Culgoa and Bokhara Rivers combine with Barwon River flows.

The Darling River at Bourke is expected to reach its minor flood level of 9.5 metres on Thursday. It is currently at 7.8 metres and rising. 

Higher levels are possible as upstream flows arrive.

Photo: NSW SES

West Culgoa Road 16 kilometres north of Bourke may close due to dangerous floodwaters. 

The Paroo River in Wanaaring fell from its major flood level of four metres on Tuesday 15 April. 

"The river level is likely to remain above the moderate flood level 3.3 metres for the next few days," the NSW SES says. 

Wanaaring is still isolated due to the floodwaters and is expected to remain cut off for several weeks. 

NSW SES helped sandbag properties and provide residents with essentials.

NSW SES is helping sandbag properties. Photo: NSW SES

"Never drive, walk, ride through play, or swim in flood, it is dangerous, toxic, and may void your car insurance. If it's flooded, forget it," the NSW SES said. 

"The safest option is to evacuate as early as possible to avoid additional hazards. Do not wait until the last minute." 

Should anyone become isolated, the NSW SES encouraged people to call 132 500.