MRC des Collines-de-l'Outaouais police say a man in Cantley called 911 at about 1:15 a.m. Saturday when he heard someone shouting.
Police later found a car deep in the ditch just off Highway 307 near Chemin Beaupré. Soon after, they also found a woman in a stream nearby. They suspect she was ejected from the car when it crashed.
The woman was taken to a hospital in Wakefield before she was transported to Hull Hospital. Police say she suffered serious injuries, but they are not considered life threatening.
Highway 307 northbound is closed and detours are in place.
Police have also taken a blood sample to determine if alcohol was a factor. There was only one vehicle involved and the woman was the only person injured.