A summer afternoon on Moon Lake in Duchesne County, Utah, took a tragic turn on July 29, 1955, leading to the disappearance of 30-year-old Calvin Wayne Bosen, his wife Ruby Mae Bosen, and her brother, Clarence Delmer Simons. The group of five, which also included another married couple, A.G. and Lucy Smith, had rented a small aluminum boat from the Moon Lake Lodge for a day of recreation on the water.
At approximately 3 p.m., in the deepest part of the lake where depths reached 115 to 125 feet, the boat's trawling gear reportedly became entangled in one of its two motors. Witnesses reported seeing the boat, with both motors running, circling uncontrollably before it capsized and quickly sank.
The suddenness of the event left little time for reaction. While A.G. and Lucy Smith were rescued by another boat, Calvin, Ruby, and Clarence vanished into the deep, cold water and were presumed to have drowned. This devastating incident prompted an immediate and large-scale search operation by the Duchesne County Sheriff's Office. Multiple boats dragged the area with grappling hooks, and a light aircraft was used to survey the lake from above, hoping to spot the submerged boat or the missing individuals. The search efforts, however, were hampered by the extreme depth of the lake. Despite diligent searches in the days, months, and even years that followed, no trace of Calvin, Ruby, or Clarence has ever been found.
Calvin and Ruby Bosen were residents of Salt Lake City and the parents of two sons and a daughter. The abrupt and unresolved nature of their disappearance has left a lasting impact on their family and the community. The case remains an active missing persons investigation with the Duchesne County Sheriff's Office. The incident on Moon Lake serves as a somber reminder of the unpredictability of nature and the enduring pain of losing loved ones without the closure of recovery. The memory of Calvin Wayne Bosen, along with his wife and brother-in-law, is preserved in the records of this unsolved case, a story of a family outing that ended in profound and lasting tragedy.Last Seen: Jul 29, 1955
