Thursday at 4.58pm
FRNSW zone commander Stewart Alexander said the fire has been mostly put out, thanks to the "excellent" work of crews.
He added their quick work ensured the fire did not spread to any other buildings.
Superintendent Alexander said an investigation would commence, but crews from Albury and Culcairn would monitor the site to give the Wagga firefighters a break.
"Anyone with information about this incident should call police," he said.
Thursday at 3.10pm
The entire Fire and Rescue NSW force of Wagga is working to put out a fire that has torn through the remains of Charles Sturt University's old south campus in Turvey Park this afternoon.
Firefighters are battling against thick smoke billowing out of a portion of the old CSU accommodation blocks at the corner of Hely Avenue and Fernleigh Road.
Police have established road blocks on Fernleigh Road to prevent traffic passing through the area while firefighters tackle the blaze.
Parents of pupils at nearby Henschke Primary School have been alerted to the fire, with the school advising there may be traffic delays caused by the smoke emanating from the old campus.
Parents were told via text that Hely Avenue is closed, students are to be collected from the Bourke Street end of the school, and all buses will depart from Bourke Street.
The fire broke out around 2pm, tearing through a building that is in the process of being demolished, FRNSW zone commander Stewart Alexander said.
"We received a number of triple 0 calls to a building alight in Fernleigh Road, fire crews responded very quickly and on arrival several minutes later (firefighters) found a large former dormitory building well alight," Superintendent Alexander said.
MOUNT AUSTIN | #FRNSW crews have responded to a #fire at a former college dormitory building on Fernleigh Rd. Firefighters have stopped the #fire from spreading to other wings of the building. Road closed in both directions. Operations ongoing pic.twitter.com/uBMUvayBEa— Fire and Rescue NSW (@FRNSW) September 19, 2019
"We've got all FRNSW resources from Wagga involved - up to 25 firefighters, and other crews en route from Albury and Henty - as well as local Rural Fire Service crews have been responded as well to give us assistance."
Neighbours of the campus, particularly those in Fernleigh Road, are urged to keep out of the smoke and monitor their health while the fire is being fought.
"The fire is well in hand however it will take some time to extinguish, given that most of the building is sealed up and given the intensity of the fire, as it is quite dangerous to get near," Superintendent Alexander said.
"The neighbours on the Fernleigh Road side, we've asked them to close their windows and call triple-0 if they're worried about the health because of the fire."
Fernleigh Road has been closed from Glenfield Road up to near Hely Avenue and the public is encouraged to stay clear of the area.
"If you don't need to be here, please stay away," Superintendent Alexander said.
The Thursday afternoon fire comes just months after part of the historic site was destroyed in what was believed to have been multiple blazes on a cold autumn evening.
More to come