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On April 29, 1903, at 4:10 a.m., 82 million tonnes (30 million cubic metres) of limestone crashed from the summit of Turtle Mountain and buried a portion of the sleeping town of Frank. The dimensions of the rock mass that fell are 150 metres (500 feet) deep, 425 metres (1,400 feet) high and one kilometre (3,280 feet) wide.
The primary cause of the Frank Slide was the mountain's unstable structure. Underground coal mining, water action in summit cracks and severe weather conditions may have contributed to the disaster.
The buried section of railway was rebuilt 3 weeks after the slide. A road was completed through the slide in 1906 and improved during the 1920s. Before it was completed, people had to travel over a rough road built beyond the rockslide debris. This temporary route passed through what is now the Frank Slide Interpretive Centre parking lot and the Frank Slide Trail follows the old road bed for some distance. Highway #3, as it is seen today, was constructed in the 1930s and improved in 1979. The elevation of the north peak of Turtle Mountain is 2,109 metres (6,920 feet) and of the south peak, 2,200 metres (7,217 feet). The coal seam that was mined under the mountain is 3 - 7 metres (8 - 23 feet) thick, pitching at approximately an 85 degree angle. Look for an outcrop of the seam on the south side of the slide, halfway up the mountain.
In the wake of the slide:
Open year-round
September 15 - May 14 Closed: Christmas Eve, Christmas Day, New Years Day & Easter Sunday.
Located 1.5 km off Highway #3 in the Municipality of Crowsnest Pass, Alberta.
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