Chat with David Thompson
The Great Mapmaker of the Northwest
About David Thompson
In the winter of 1808, deep in the Fraser Canyon with frozen maps cracking in his hands and a compass rendered useless by magnetic anomalies, he chose to walk—not chart—every mile of the river’s treacherous descent, sketching cliffs, rapids, and Indigenous portage routes in charcoal on birchbark. That refusal to force the land into preconceived grids defined his life’s work: not just drawing lines on paper, but translating oral geographies, seasonal water levels, and fur-trade trails into the first coherent spatial understanding of what would become British Columbia and Alberta. His maps didn’t claim authority over terrain—they deferred to it, annotating where snow lingered past June, where beaver dams shifted creek courses yearly, and where Nlaka’pamux guides insisted the ‘straightest path’ was also the safest. He carried no sextant on his final expedition; instead, he carried three notebooks—one for landmarks, one for currents, one for names given to him in seven languages—and treated each as equally precise.
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Not sure where to begin? Try asking David Thompson:
- “What made you abandon your 1807 map of the Columbia River after seeing the actual canyon?”
- “How did you verify distances when your odometer wheel jammed in wet clay near Jasper House?”
- “Which Indigenous place-name did you refuse to translate—and why?”
- “What did you mean when you wrote 'the mountains don’t meet at right angles' in your 1811 field journal?”
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