Following flood damage to the school, Bulli High will not be running classes for students in years 7 to 10 on Wednesday, as clean-up and restoration works continue.
However, the school will be open for year 11 and year 12 students and staff will be on duty to supervise students from years 7 to 10 whose parents need to have their children supervised.
Certain areas will be cordoned off to ensure the safety of students and staff.
Areas affected by the flooding include the administration building, maths rooms, industrial arts rooms, music rooms, special education classroom, the HSIE rooms, senior study room, the tiered learning centre, canteen and old gymnasium.
An assessment will be made on Wednesday about operations for Thursday and Friday this week.
Parents, caregivers and students will be notified via the school's website about when students will be able to return to the school.