The driver's 5-year-old daughter was flown to a Salem hospital where she remains in critical condition. The other 6 people involved were taken to area hospitals with minor to serious injuries.
Officials said Gustavo Guevara-Hernandez, 35, of Salem was driving north in the interstate when around 6:10 a.m. Saturday he fell asleep at the wheel.
The van drifted off the road at exit 233, struck a guardrail attenuator and rolled onto its top, blocking the off ramp.
The Oregon Department Of Transportation said the northbound 233 exit was closed for over three hours while crews rescued the van's occupants and investigated the crash.