Frank Slide in Crowsnest Pass, Alberta, Canada the location of Canada's Deadliest Rockslide.

At 410 in the morning on April 29, 1903, 110 million tonnes of limestone crashed from the summit of Turtle Mountain and buried part of the town of Frank.

Of the 600 people living in Frank at the time, over 100 were in the path of the slide. Of those more than 90 were killed. Most were never recovered so there has never been an exact number established.

Witnesses in and around Frank said the slide lasted approximately 100 seconds and based on how far the rocks extend across the Crowsnest River valley scientists estimate that rocks were moving at speeds up to 120 kilometres per hour (70 miles per hour).

An area of 3 square kilometres on the valley bottom was buried to an average depth of 14 metres (46 feet), with some spots as deep as 45 metres (150 feet).

There were 3 young girls who survived the slide, plus 20 other people pulled alive from the rocks, along with over 500 people from the town site of Frank who were not in the direct path of the slide.

The primary cause of the Frank Slide was the mountain’s unstable geological structure. Underground coal mining, and water through cracks in the mountain were identified as secondary factors.

Scientists believe that another significant rock slide will occur at some time in the future on Turtle Mountain. It is currently being closely watched with monitoring equipment and other technologies.

Come along as we explore this location from Canada's history.


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