Firefighters are making progress on a wildfire sparked by target practice at a public shooting range in Grand County.

County Emergency Manager Nowell Marie Curran said Wednesday that the wildfire that has scorched about 600 acres is now 80 percent contained.

No structures are threatened and no injuries have been reported. Earlier, one residence was briefly evacuated but the occupants have been cleared to return.

A group of range users reported the fire Monday near the area where they were shooting. Officials with Colorado Parks and Wildlife spoke with the group and found no evidence of illegal behavior.

The Byers Rifle Range and Pioneer Park in Hot Sulphur Springs remain closed.

Curran says crews are using controlled burns to strengthen the perimeter around the wildfire. Helicopters were also dropping water.