Earth moving equipment was unable to keep up with the 3.5 feet per hour movement of the earth and within five days the slide had created a 900 acre lake 2.5 miles long and 200 feet deep. It was deemed that the natural earth dam was unstable and an upper spillway tunnel was constructed, water was pumped out and by December 1983 a lower tunnel was constructed to finish the removal of all water behind the dam.
The residents of Thistle were all displaced by the waters of the Spanish Fork River. The two railroad tracks and U. S. Highways 6 and 89 have since been successfully re-routed.
G. William Wiersdorf
See: U.S. Forest Service Plaque; Utah Place Names 1997, John W. Van Cott.