Sheriff's Lt. Dan Smith said Friday that an incoming storm may delay recovery efforts.
The single-engine plane was occupied by 51-year-old pilot, Dale Smith, a software executive from San Jose, Calif.; his son, Daniel Smith and his wife, Sheree Smith; and daughter Amber Smith with her fiance, Jonathon Norton.
The plane was flying from eastern Oregon, where the family had been spending the Thanksgiving holiday, to Montana, where Daniel and Sheree Smith live, on Dec. 1 when it disappeared in the mountains 150 miles northeast of Boise.
Dale Smith reported engine trouble and sought information about a backcountry landing strip where he hoped to put the plane down safely.
Authorities had suspended the search for the aircraft in mid-December.
According to Federal Aviation Administration records, Smith, an executive and co-founder of San Jose-based SerialTek, obtained his pilot's license in 2005.