Early Tuesday morning Houston RCMP received a report of a pickup truck in the Morice River.
Officers found a truck left the Morice River Forest Service Road near the 23km mark.
A female passenger was rescued by first responders, but the male driver is still missing.
The police are investigating what caused the accident, but alcohol is considered a factor.
The investigation is on-going, with the focus on locating the missing man with search and rescue crews still in the area.