On a summer day in late July 1955, 30-year-old Ruby Mae Bosen of Salt Lake City went out on Moon Lake in Duchesne County, Utah, with her husband Calvin Wayne Bosen, her brother Clarence Delmer Simons, and another married couple, A.G. and Lucy Smith. The group rented a small aluminum boat from Moon Lake Lodge that had two motors, one on the back and another on the side; the sheriff later said the boat was too small for five people.

While the boat was over the deepest part of the lake, estimated at 115 to 125 feet, its trawling gear became entangled in one motor. Witnesses on shore reported the boat began swinging in circles with both motors running, then suddenly overturned and sank. A.G. and Lucy Smith were rescued by a nearby boat, but Ruby, Calvin, and Clarence disappeared beneath the surface and were never recovered.

The Duchesne County Sheriff’s Office mounted an extensive search with four boats dragging grappling hooks, aerial searches, checks of debris-wash areas and attempts to find a diver who could reach the lake’s depths; searches continued into the following spring without success. If anyone knew the Bosens or the Simons family, or has information about Moon Lake that might shed light on what happened that day, please share what is known.