Karen Mast

Beloved Mother, Wife , Grandmother, Great Grandmother, Great Great Grandmother and Friend passed away January 7th 2026 surrounded by friends. Karen was born August 7th 1936 to Maynard and Flossie Berthelson in Shelley Idaho. She was raised in Shelley Idaho and went to school there. She worked in cafes and spud houses. She married Howard Clark September 1954, and they settled in Caldwell Idaho. Howard had a service station and when he sold out he bought a Diesel and started hauling produce. They moved to Montana in 1975. They adopted two boys, Ken and Steve. Karen started to run with Howard in the truck. In 1996 Howard passed away. Karen sold the truck and started working as a grandma at the Whitehall grade school for the next 17 years. She loved working with the teachers, students and the other grandmas. Karen married Dave Mast in 2002. She spent that time helping Dave with trucking until Dave passed away in 2020. After many surgeries on her legs and hip, she got along on a cane. Karen enjoyed her church, The Church of Jesus Christ of Latter Day Saints and worked in the Relief Society. Karen was helped with everything by Michael and Tricia Smith Family. Karen had a great sense of humor, loved animals, she loved getting her nails and hair done, loved getting a hamburger with family and friends. Karen loved gardening even growing a squash in a pot on the porch one year. Karen was always kind and thoughtful of others and their feelings. She is survived by Brother Robert Berthelson, Sister Beverly Grover and Son Steve Clark. Preceded in death by Howard Clark 1996, Dave Mast 2020 and Kenneth Clark 2021. Per her wishes there will be a graveside service planned January 12th 2026 at 3:00 pm at the Whitehall Cemetery in Whitehall Mt. Where she will be laid to rest next to Howard Clark.