Smoke billows over the Rincon Mountains northeast of Vail from a lightning-caused wildfire.

Kelly Presnell / Arizona Daily Star

A small lightning-caused fire is burning near the top of the Rincon Mountains in Saguaro National Park East.

The blaze near Spud Rock Springs had consumed about 20 acres as of Thursday evening on the upper west side of the Rincons east of Tucson. It is being called the Deer Head Fire, said Susan Keys, with the park’s fire management program.

The fire likely was sparked when a storm rolled into the area late Wednesday, she said.

The fire is burning at an elevation of about 7,500 feet in steep, rugged terrain. Vegetation in the area includes ponderosa pine, oak and brush, according to park officials.

The area has burned six times since the 1940s — most recently during the 1994 Rincon Fire, officials said.

The fire’s behavior Thursday was moderate, dampened by humidity and rain, park officials said. So far no one is fighting the fire. Park personnel were planning to go up in a helicopter late in the afternoon to survey the area before deciding how to best manage the wildfire, Keys said.

No closures were in place as of Thursday.

Kimberly Matas