An Oregon Family Vanished in 1958. Their Car May Have Been Found in a River.

On Dec. 7, 1958, Ken and Barbara Martin of Portland, Ore., took their three daughters on a family trip through the mountains en route to collect Christmas greenery. They stopped at a gas station near Cascade Locks, Ore., on the banks of the Columbia River, but were never heard from again.

The case of the Martin family’s disappearance has bewildered local residents and investigators for more than 66 years — until Friday.

Acting on a tip from a diver, the authorities spent two days dredging up parts of a car in Cascade Locks that they believe is the Martins’ 1954 red and off-white Ford station wagon — potentially bringing at least part of the mystery of their disappearance to a close.

Shortly after the family’s disappearance, the authorities speculated that their car might have gone over a cliff near the city of Cascade Locks, plunging into the Columbia River in an isolated area, The Associated Press reported at the time.

But there were no immediate answers, even in 1959, after the authorities recovered the bodies of two of the three Martin daughters in the river: Virginia, 13, and Sue, 11, who were found 25 miles apart. Barbara, 14, and her mother and father, ages 48 and 54, were nowhere to be found.