Frank Slide a century later: the Turtle Mountain monitoring project

The Frank Slide occurred at 4:10 AM on April 29, 1903 in what is now southwest Alberta. The slide lasted 90 seconds, and involved some 30 million cubic metres of limestone from the east face of Turtle Mountain. It covered an area of 3 km2 with an average depth of 14 m of rock debris, burying the south end of the town of Frank, the main road, and the CPR mainline, and damming the Crowsnest River (Stewart 1903). The slide killed about 70 people.