Alaska State Troopers rescued a 59-year-old Anchorage woman who was impaled in the knee by an arrow that was left on a Cooper Landing Trail Thursday afternoon.

The woman, identified by troopers as Janis Bronson, was more than four miles from the trailhead when she stumbled on a tip-up arrow left there, according to troopers, impaling her knee.

Troopers were called to the Lower Russian Lakes Trail at about 3 p.m. Thursday. They hiked for an hour and a half before they reached Bronson, where they waited with a U.S. Forest Service employee for medics to arrive.