According to a news release from the Idaho County Sheriff's Office.

On Saturday morning, 64 year-old Burke Despain of Kalispell, was reported missing in the area of Hwy 14 milepost 21 in Idaho County where he and his son Jason were camped. 

When Jason awoke Saturday morning he was unable to locate his father.

Idaho County deputies and search and rescue personnel, including a search dog, responded. 

The search of the surrounding area roads, river and river banks and was unsuccessful in locating Mr. Despain.  The search dog indicated that Mr. Despain had gone to the river bank where it is believed he slipped and fell into the river.

The search continued Sunday and again Monday with family and search and rescue units patrolling the area.