These are pictures from 1971 at Monte Fullmer's first projectionist job. This drive-in is still in operation, but the machinery has been changed out due to the massive 1976 Teton Dam flood that almost wiped out this drive in. The drive in was rebuilt the following year to continue operation. The machinery that was installed after the flood to were the Ballantyne PRO 35s's EPRAD SWORD 13k reel system and radio sound. This picture is a view from Highway 20 heading north from Rexburg, Idaho.
January 1971 photo from the Monte Fullmer collection.