A Hillsboro woman is dead after trying to cross a Washington County highway before dawn Tuesday morning.

Leslie Schmadeke, 51, was struck by a car as she crossed Tualatin Valley Highway at Northwest 341st Avenue near Cornelius, the Washington County Sheriff’s Office said Tuesday. Medics took her to a local hospital, where she later died.

The sheriff’s office said conditions were dark and foggy when Schmadeke tried to walk across the highway at around 7 a.m. Officials also said she was wearing dark clothing, and that there are no streetlights on that stretch of highway.

The driver of the minivan that struck Schmadeke stayed at the scene and cooperated with deputies, the sheriff’s office said. No criminal charges have been filed.

In a news release, the sheriff’s office reminded people of the dangers of crossing dark highways while wearing dark clothing. Officials recommend pedestrians wear bright, reflective clothing or carry flashlights while walking along busy roads in the dark.

--Jamie Hale | jhale@oregonian.com | @HaleJamesB