Construction of the new Towrang Bridge, currently underway, can't come soon enough for many, who have no other way to reach Goulburn during heavy rainfall.

Resident Mark Collins said his property, 2.5km from the village hall, received about 50mm from about 8pm Friday.

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Power was cut from about the same time to 127 Towrang residents but Essential Energy said the storms also sparked outages to 473 premises across Goulburn, Taralga and Big Hill.

At Towrang, damaged powerlines fell into the Wollondilly River, prompting a tricky repair operation.

"Network protection equipment operated to isolate supply to these customers just before 9pm Friday," an Essential Energy spokeswoman said.

"Due to the height of the Wollondilly River, Essential Energy crews were unable to access the damaged network via vehicle."

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On Saturday morning, a helicopter was deployed to help ground crews identify the fault. They discovered damaged powerlines on Towrang Road and one in the river.

Workers were dropped via helicopter to the damaged lines to isolate supply and restore power to 60 homes.

On Sunday, the helicopter was used to pull the powerlines from the river and repair the damaged network. All power was restored by 5pm Sunday.

Mr Collins said while rain was heavy in Goulburn from 5pm, it didn't start at Towrang until 8pm. The water rose rapidly in the Wollondilly River and bridge access was cut by midnight.

It was the fifth flood in about a year and Mr Collins said, combined with electricity and phone outages, was a major issue for residents.

"This becomes an absolute island," he said.

"The key thing is that (when the bridge closes) it doesn't just impact Goulburn Mulwaree but also Upper Lachlan Shire. People from Swallowtail, Big Hill and Greenwich Park can only get to Goulburn via Towrang because causeways are flooded out their way."

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In the event of emergencies, such as a heart attack, people were effectively stuck, he said.

Moreover, new residents in the area didn't necessarily know how rain impacted the bridge.

The SES has delivered medications to several people via flood boat in the past.

Work started last year on a $4 million two-lane bridge replacement. It will raise the level by 4.5 metres. The project, and road approaches, are expected to be finished by May.

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Mr Collins said floodwaters had risen to the construction level last year. Its height was about the same as that outside his home and in a large flood, he argued people wouldn't be able to pass his house, let alone the new bridge.

He has owned his property since 1984 and built a home there in 1991. That was the year a major flood struck, followed by another in about 2005/06 when water filled the railway viaduct. He's seen many since then.

On Friday, he was more fortunate than most. His home has operated off the grid, thanks to 22 solar panels on a shed, since 1991. Mr Collins also has a back-up generator.

Most residents had their power restored by Sunday afternoon, while the bridge re-opened earlier that morning.

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