A Lake Oswego woman and her 12-year-old daughter died Monday when their speeding car careened into oncoming traffic along U.S. 26 and struck another vehicle, Oregon State Police said.

The Christmas Day tragedy, which occurred in Wasco County, also injured a pair of Portlanders in the other car, police said.

Deirdre Lynne Mackey, 48, and her young daughter were driving east in a 2008 Nissan Versa when the car, believed to be driving too fast, suddenly lost traction and crossed into oncoming traffic around 3:25 p.m. near milepost 65, said Sgt. Kaipo Raiser.

A westbound 2018 Subaru Outback carrying Darrow Geordan Rupp, 41, and Maria Suzanne Veltman, 39, was unable to stop and plowed into the passenger side of the Nissan, Raiser said.

Mackey and her daughter both died at the scene, police said.

Medical personnel rushed Rupp and Veltman to Legacy Emanuel hospital, where they were treated for non-life-threatening injuries, police said.

U.S. 26 remained partially closed for over 10 hours during the course of the investigation, police said.

-- Shane Dixon Kavanaugh

skavanaugh@oregonian.com

503-294-7632 || @shanedkavanaugh