A Pittsburgh-area woman was injured Saturday afternoon when she fell about 10 feet while “bouldering” at McConnells Mill State Park in Slippery Rock Township, Lawrence County, authorities said.

A medical helicopter flew the woman, believed to be in her upper-20s, to a Pittsburgh hospital with an apparent broken right leg.

Curtis Reynolds, a ranger, said the woman was with four or five friends at the park's Rim Road climbing area when the accident happened about 4 p.m. The area is near the covered bridge.

They were bouldering, Reynolds said, which is a form of rock climbing in which participants are not “roped up,” but use a safety mat underneath them to guard against injury.

Bouldering is performed on small rock formations at the park. “Ten to 15 feet is as high as they climb,” Reynolds said.

Authorities believe the woman hit her right leg on a rock before landing on the six- to eight-inch thick mat. She did not hit her head, rescuers said.

Volunteer firefighters from Slippery Rock and Scott townships in Lawrence County and Portersville in Butler County responded. Crews loaded the woman onto a Stokes rescue basket and carried her to safety.

Noga Ambulance medics tended to her before they took her to a field next to the Kildoo parking area where a STAT MedEvac helicopter landed. She was flown to UPMC Presbyterian hospital. Authorities expected her to undergo surgery for her injured leg.