The council has estimated more than $500,000 worth of infrastructure was damaged in this week's heavy rain.
Goulburn itself has received close to 90mm since last Thursday but parts of the region have registered larger falls.
Operations director Matt O'Rourke said most of the damage was to roads in the western area of the LGA, including Kippilaw Bridge, Mount Baw Baw Road, Parkesbourne Road, Merilla Lane, Range Road, Pomeroy Road and Cullerin Road. But the deluge also caused problems for Caoura Road at Tallong, Sandy Point Road, Towrang Road bridge, Highlands Way and a host of others.
Mr O'Rourke said most of the damage was to culverts and causeways. Flood waters also felled numerous trees and piled up debris around waterways. In total, 30 sites require remedial work.
Disaster assistance, funded jointly by the state and federal governments, has already been extended to several council areas in the Hume electorate, including Wingecaribee, Wollondilly and Camden.
A disaster declaration helps councils with clean-up and repair costs as well as assisting eligible people whose homes or belongings have been damaged; extending concessional rate loans for small businesses, primary producers and non-profit organisations; freight subsidies for primary producers; and grants for eligible non-profit organisations.
Mr O'Rourke said said the council's damage bill exceeded the $240,000 threshold and expected a disaster declaration in coming weeks, enabling the organisation to recoup repair costs.
"We're very familiar with the process and I expect that will play out," he said.
Outdoor staff have abandoned scheduled work this week to deal with the clean-up.
Fifteen of the 110 solar lights along the Wollondilly Riverwalk were flattened when the waterway breached its banks on Monday. But the Gibson Street footbridge survived largely intact, thanks to railing that was designed to be flattened in flood. Mr O'Rourke said only one piece of railing required repair and staff had cleared debris and reopened the structure.
Most of the roads that were closed on Monday and Tuesday have also since reopened.
In 2016, following an east coast low and extensive flooding, the council also received more than $1 million in disaster funding.
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