The crash occurred around 10:30 a.m. near the intersection of State Street and Bogart Lane.
The sheriff's office says the woman from Eagle, Idaho, was driving a Buick LaCrosse eastbound on State State when she swerved into oncoming traffic and attempted to hit an oncoming vehicle. The two cars missed each other and the Buick returned to the proper lane.
But as the woman approached Bogart Lane, she again swerved into oncoming traffic and collided with a Ford F-250 pickup truck, causing it to roll.
The 64-year-old driver of the truck was not wearing a seat belt and was thrown from the vehicle. He is currently in the hospital with life-threatening injuries. Doctor's say he is expected to survive, but he remains in critical condition.
The sheriff's office says after the Buick hit the Ford truck, it then also struck the Dodge pickup truck that was driving behind the Ford. The 16-year-old driver of the Dodge was treated for minor injuries at the hospital and released.
Officials say the 70-year-old driver of the Buick was also taken to the hospital with non life-threatening injuries. Investigators say she told them she intentionally drove into oncoming traffic to attempt to kill herself.
The sheriff's office says that charges are pending against the 70-year-old woman, and that after its investigation it will forward that information to the prosecutor's office.
The woman's name is being withheld until charges have been filed.