English: The "dam" formed by a 1983 massive landslide (slump) which created a reservoir that flooded the town of Thistle and the scar from where the mountain formerly rested. This picture was taken from a window on the California Zephyr just as the train was entering the the Billies Mountain tunnel. Also visible in the photograph is a dirt road made from the original railroad alignment up to the dam and a spillway created to ease pressure on the forming dam. Prior to 1983 a photograph from this vantage point would show a free flowing Spanish Fork River and a few buildings.