A Down East wildfire that firefighters have been battling since Sunday evening is now 80% contained, the Maine Forest Service said on Thursday.

The fire off Track Road in Baileyville grew from 22 acres when crews first responded on Sunday to 30 acres by Monday. At that time, the flames were only 20% contained.

A containment line is now around the entire perimeter, the forest service said, though the fire remains at 30 acres in size.

There is no threat to structures or the public from the fire, which is burning near Maine’s border with the Canadian province of New Brunswick, the forest service said in a social media post this week.

As of Thursday, Maine has seen 525 wildfires this year, according to the forest service, including more than 120 since Aug. 1.

Maine has seen 650 wildfires and 550 acres burnt on average over the past five years, the forest service said. If the state sees a “typical” fall season for wildfires, Maine Forest Ranger and Fire Prevention Specialist Terri Teller said in an email, “we are well on our way to exceed those averages.”

All of Maine was under a high danger advisory for wildfires as of Thursday, with conditions exacerbated by a drought that is affecting many parts of Maine. Some parts of the state reached a very high danger level Wednesday, which forest service officials said is unusual for this time of year.

The forest service said firefighters were also combating three other ongoing wildfires as of Thursday afternoon, including an 8-acre fire in Acton, where crews expect to be on scene into the weekend.

Most of August’s fires have been caused by campfire-related incidents, debris and open burning, and equipment malfunctions, the forest service said. Burning permits have been paused statewide.

“I want to express my deep appreciation for the dedication of Maine Forest Rangers and all who stand with us — local fire departments, call-when-needed firefighters, and our many partners,” Chief Forest Ranger Robby Gross said in a statement Thursday. “Whether in routine operations or during periods of heightened risk, their professionalism and teamwork make all the difference in protecting our communities and natural resources.”