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April 23, 2019

Construction is underway for Exshaw Creek flood mitigation project



As reported in The Bow Valley Crag & Canyon, construction of the $10.3 million debris-food mitigation project for Exshaw Creek project began on April 1.

A press release from the MD of Bighorn and Lafarge Exshaw Cement Plant stated last week that work is expected to be completed by October, and that final touches, including landscaping, will be done in the spring of 2020.

“Designed for a one in 500-year event, construction includes a debris retention structure to minimize the quantity of fallen trees from reaching Highway 1A. The creek channel will be widened and deepened to contain flood flow. A sediment basin will be excavated for the deposition of debris to minimize potential blockage to bridge crossings at Highway 1A, CP Railway, and Diamond Drive. An overflow weir and outlet channel will be constructed to direct the flood flow to the Bow River. Class 3 and Class 4 riprap will be provided for erosion protection.”

The MD of Bighorn awarded the contract to Devcon Inc. Construction will be on hold during the spring runoff.

Reeve Dene Cooper said the project was a robust response to the flooding of 2013.

“There has been a lot of work done upfront, from design to securing funding commitments. Kickstarting construction is the culmination of these efforts and the last step to securing the safety of the Exshaw community from unprecedented and unexpected flooding,” said Cooper.

Over 58,000 tonnes of riprap stone, a year supply of production, is being provided by Lafarge to help reinforce the banks of Exshaw Creek. Lafarge is also providing 3.2 hectares of land, including 1.6 hectares of privately-owned land and 1.6 hectares of Crown land that is leased by the cement plant. The total value of Lafarge’s contribution is $3.7 million.

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