Summary
In mid-November 2021 an exceptionally strong atmospheric river dropped near-record rainfall on southern British Columbia and neighbouring Washington State, triggering widespread flooding and landslides. Over a few days it severed every major road and rail corridor linking the coastal city of Vancouver — home to Canada’s largest port — to the rest of the country, and forced the shutdown of a major crude-oil pipeline. A regional weather event became a national supply-chain crisis, compounding disruptions already caused by the pandemic.
Systemic Features
- A single event striking a chokepoint. The Port of Vancouver, which handles roughly a third of Canada’s trade in goods outside North America, depends on a narrow set of road and rail corridors through mountainous terrain. Landslides and washouts cut Highways 1, 3, 5 (the Coquihalla), 7 and 99 and both the CN and CP rail lines at once, isolating the port from inland Canada — there was no redundant route to fall back on.
- Cross-sector cascade from one trigger. The same event that stopped freight also shut the Trans Mountain pipeline, cutting fuel supply to the region and prompting rationing and panic buying, while the flooding of the agricultural Fraser Valley drowned livestock and cut feed supply. One trigger, multiple simultaneous failures.
- Compounding conditions. Record summer heat and wildfires earlier in 2021 had left soils saturated and, in places, hydrophobic, worsening the runoff and landslides — a sequence of climate extremes stacking on one another.
- Failure atop existing fragility. The disruption landed on a global supply chain already strained by the pandemic and a shortage of truck drivers, so a regional shock amplified a pre-existing systemic stress.
Cascading Systems Affected
- Rail and road freight, and the Port of Vancouver (national and trans-Pacific trade)
- Fuel supply (Trans Mountain pipeline shutdown; rationing)
- Agriculture and food supply (Fraser Valley farmland and livestock)
- Consumer supply chains and prices across Canada
- Communities displaced by flooding
Impacts
- At least five people were killed and around 17,000 displaced; a provincial state of emergency was declared and the military deployed for a month.
- All rail service to and from the Port of Vancouver was halted; ship backlogs and container-traffic collapse followed, with roughly $550 million a day of shipping activity interrupted.
- It became the costliest natural disaster in British Columbia’s history, with insured damage of at least C$450 million and total economic losses estimated well higher.
- The event became a case study in the vulnerability of concentrated trade chokepoints to climate-driven extreme weather.
Sources
- “2021 Pacific Northwest floods”, Wikipedia — https://en.wikipedia.org/wiki/2021_Pacific_Northwest_floods
- “How an atmospheric river led to the disastrous isolation of the port of Vancouver”, AXA Climate — https://climate.axa/publications/how-an-atmospheric-river-led-to-the-disastrous-isolation-of-the-port-of-vancouver/