The NSW National Parks and Wildlife Service (NPWS) has been managing a new fire since Sunday afternoon that may have ignited due to public carelessness at Landers Creek Falls, Talbingo Reservoir, in Kosciuszko National Park.
NPWS is using dozers to clear containment lines and monitoring the fire from the air. Talbingo residents and people in the area should expect smoke haze in the coming days.
Area Manager for the Riverina Highlands Mick Pettitt said 150 hectares had burned as of Monday, midday, in an area last burned in 2003.
"We are conducting hazard reduction burns throughout Kosciuszko at the moment however this exact location was not scheduled for burning this year," Mr Pettitt said.
"Investigators are still looking into the cause of the blaze, but it never hurts to remind the public to fully extinguish camp fires, always extinguish and bin your cigarette butts, take extreme care when cooking, and be mindful of sparks from motors or equipment.
"Anyone with information about the origin of this fire should call NPWS on 6947 7000 and if necessary, we can treat your call confidentially."
Report emergencies including fires to 000.