A Transport for NSW spokesman said debris 750 metres below Pipers Lookout that fell as a result of a slip on Saturday, March 20, has been cleared.
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However, further work to stabilise the route will see the Snowy Mountains Hwy closed at night for eight weeks starting mid next month.
The highway will be closed between 7pm and 7am, Sunday to Thursday, for eight weeks from April 19, weather permitting
Detours during this work will be in place for both light and heavy vehicles via the Princes Hwy or Imlay Rd and the Monaro Hwy, which are expected to add up to 1.5 hours to journeys.
Work will also be carried out during the day between 7am and 7pm, Monday to Friday under single lane closures and a reduced speed limit of 40kmh. Delays of up to 15 minutes can be expected. A single lane closure will be in place on three weekends during the work, including May 1-2, 8-9 and 15-16.
No "over size over mass" vehicle travel through Brown Mountain will be permitted unless prior arrangements have been made with the project team.
A Transport for NSW spokesperson said additional slips on March 23 and 24 due to heavy rainfall also caused debris to block traffic.
"The slip on March 24 resulted in debris, including fallen trees and boulders falling on the road blocking it in four locations and Transport for NSW crews attended the site and cleared the debris."
The spokesman cautioned that weather events that may increase the risk of slips between now and the planned slope stabilisation work in mid-April.
The $2.2million slope stabilisation project will remove selected boulders, trees and unstable natural material. Mesh will also be pinned to some areas. The objective of the planned work is to prevent erosion which could lead to large boulders falling onto the road during future weather events.
Bega Valley Shire Mayor Russell Fitzpatrick said there had been landslides on the mountain for 30 years and he believes it was just going to keep on happening.
Cr Fitzpatrick said an alternate route or alternate reconstruction of the road was needed in the long-term, and suggested federal and state governments should work together to make the Brown Mountain a route of strategic importance.
"The local community needs permanent access on the road for emergency services, freight travel, tourism and for our main industries," Cr Fitzpatrick said.
"We should be looking for an alternate route that guarantees those freight movements and also transport movements for residents on a permanent basis irrespective of rain."
