Firefighters are working to protect areas of Tidbinbilla and Corin Dam from the Orroral Valley bushfire, after the out-of-control blaze jumped containment lines overnight.
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The fire, which has burnt more than 63,000 hectares, breached containment lines on Monday night following a southerly wind change in the late afternoon. It is burning closer to Corin Road and Corin Dam.
Firefighters are hoping for calmer conditions in coming days. Rain is forecast over the weekend.
ACT Rural Fire Service chief office Joe Murphy said crews were working to bring the fire back under control to the north of the firefront.
"There was quite a strong breeze over the fire and we saw the north containment lines near Corin Dam breached and there was a good proportion of fire activity to get the fire back under control and behind containment so we can get control around the fire," Mr Murphy said.
"We haven't forgotten about the rest of the fire and we got crews patrolling to the north, east and south.
Mr Murphy said the cooler weather would be advantageous for fire crews, who had been fighting the fire for more than a week.
"The next few days we'll be active firefighting where we can and the eastern and southern edges will see more activity on the firefront," he said.
"The cooler weather will help out the containment strategy."
A contingent of 160 firefighters from Queensland arrived in Canberra on Tuesday to assist their ACT counterparts in fighting the bushfire in the Namadgi National Park.
Among them was Sunshine Coast resident David Cronk on his fourth interstate firefighting deployment this bushfire season.
"Other states have come in when we've done it tough and now it's time to return the favour," Mr Cronk said.
"I think it just draws on the Aussie spirit, when people are doing it tough, you come in and chip in and do your bit to help."
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The 160 firefighters will be stationed in the ACT for the next five days and stay at the Australian Defence Force Academy during their mission.
"We'll generally be assisting the crews and those that have been hard at it and to give them a break and respite," Mr Cronk said.
Mr Murphy said managing ACT fire crew fatigue was a key focus.
"The volunteers at the ACT Rural Fire Service are energised and this is what they're primed for and they're fully committed to what they're doing and they've been doing it for a long time," he said.
"We're making sure that others like friends, families and employers get time with them as well and firefighters get back those social networks.
"We still have a full contingent of firefighters on a swing shift every day."
Sunny conditions and a top of 30 degrees is forecast over the firefront on Wednesday with light north-easterly and easterly winds of up to 30km/h.
Rain is forecast to start on Friday and showers are predicted through the weekend and into Monday, when milder temperatures are expected.