A small wildfire on the western end of the southern slopes of the Santa Catalina Mountains north of Tucson just above and east Swan Road on Thursday September 6, 2018.

A lightning strike started a fire in the Santa Catalina Mountains Thursday evening, officials confirmed. 

The fire, named Pontatoc, was reported about 6:30 p.m. One acre had burned near Finger Rock Canyon, said Heidi Schewel, public affairs officer for the U.S. Forest Service.

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No structures are threatened by the fire, she said.

The fire is currently a quarter of an acre in size, according to a Facebook post by the Coronado National Forest

Firefighters are on scene and are monitoring the fire.