Cynthia Robinson, Senior Hydrologist with the Bureau of Meteorology, says there is the potential for further widespread rainfall which is of concern.

"Keep in mind that it is a developing situation," she said.

"What I can tell you is that catchments are saturated, dams are full, and flooding does continue in several inland rivers.

"If we do see heavy rainfall develop on the weekend, it's possible we will see renewed river level rises and flooding.

"An area of concern is the Lachlan River, where major flooding does continue (at Cottons Weir).

"If we do see heavy rain, there is a possibility that we will see renewed river level rises and potential prolonged flooding."

The Lachlan River remains at moderate flood level at the Iron Bridge in Forbes, with Lake Forbes and the Lachlan River now spilling into low-lying areas of Forbes.

The Bureau of Meteorology forecast gives Forbes a 90 per cent chance of rain starting Saturday and a 95 per cent chance of rain on Sunday.

Forbes could get 3-8mm Saturday and anywhere from 15 to 35mm Sunday on the already sodden floodplain.

At Cowra, the BOM predicts 5-10mm Saturday and anywhere from 20 to 40mm Sunday.

Water NSW on Wednesday told Australian Community Media they were aiming to reduce the dam to 97 per cent of its capacity before the rain arrived.

The roads between Forbes and Eugowra, Cowra and Grenfell remain impacted by floodwaters following last weekend's rain event which saw Wyangala hit 104.9 per cent of its capacity with up to 80 gigalitres a day flowing downstream.

Check before you travel, with major road impacts updated through LiveTraffic and local roads on the Forbes Shire Council website.

You can subscribe to their SMS alert system by phoning the council office on 68502300.

Forbes SES is still seeing requests for sandbags in Forbes: if you can help please head to the depot on the corner of School Road and Farnell Street.

"We've got a huge loader and a flash sandbag machine to do the heavy work, we just need you to help pack and stack them onto pallets for the community," they posted to Facebook.