Keeping rocks from rolling

Fewer rocks will be rolling onto a major highway thanks to new fencing near Three Valley Gap.

A new rock fall fencing system is now in place to improve safety for those travelling along a technically challenging section of Highway 1.

“For years, people travelling through Three Valley Gap have had ongoing concerns with falling rock,” said Claire Trevena, Minister of Transportation and Infrastructure. “Ministry staff have developed an innovative solution to help keep people safe. This new fencing system will reduce the chance of rocks landing on the highway, while also withstanding the heavy snowfall and debris that comes from regular avalanche activity in the area.”

The fencing is located 20 km west of Revelstoke along the busy Trans Canada Highway.

Because of the geography, intense weather and avalanches in the area, regular fencing would not work so crews installed the attenuator fencing system.

The new fencing system is approximately 122 metres long, consisting of five-metre high steel posts spaced about 10 metres apart.

The posts are supported by a network of steel cables that are anchored six metres into bedrock. The slope mesh material that is hung from the cable support system consists of two layers of high-strength steel rockfall-control netting.

The system is designed to withstand potential damage caused by snow loading and avalanche activity, without compromising the effectiveness of the remote avalanche control systems that were installed in the area in 2017.

If the pilot is successful, the system could be considered for other rock fall areas at Three Valley Gap.

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