How the blockage will affect one of B.C.’s most important salmon runs remains uncertain
Provincial modelling shows that a massive landslide currently blocking the Chilcotin River in B.C.’s Interior will likelyHowever, when the river will flow again and how the blockage will affect one ofOfficials monitoring the dam now believe the 10-kilometre-long lake that has formed behind the landslide, located about 280 kilometres north of Vancouver, will gradually flow over the dam rather than breach it suddenly.
The Chilcotin flows into the Fraser River, providing about 10 per cent of the larger river’s volume as it snakes south toward the Lillooet, Lytton, Hope and, eventually, Vancouver. Ms. Ma said water from the dam would take between 12 and 24 hours to reach those major population areas, giving emergency officials time to alert people near the river.
“What will happen is eventually that lake will fill up, the water will start spilling over the top, and once that water starts going over the top, it’s just going to cut a slot through the landslide debris,” he said. “The river will start working through the sediment, and it’ll restore itself.” Mr. Alphonse said the area’s shifting geography is embedded in the local language. In Tsilhqot’in, the area of the dam is called Nagwentled, which translates to “landslides across river.”
Nathan Cullen, B.C. Minister of Water, Land and Resource Stewardship, said that historical data from 1964 and 2004 landslides indicate that salmon are likely to adjust to the current environmental factors.
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