"David Thompson is a hero in Canada, yet has remained largely unknown in the United States. Between 1801 and 1812, this fur trader, explorer, and cartographer established two viable trade routes across the Rocky Mountains in Canada and systematically surveyed the entire 1,250-mile course of the Columbia River. In succeeding years he distilled his mathematical notations from dozens of journal notebooks into the first accurate maps of the northwest quadrant of North America. Information from some of his earlier mapwork was even used by the Lewis and Clark Expedition."

1800-1899, Biographies, Canada, Canada Canadian Northwest, Canada Canadian Rockies, Canadian Rockies (B.C. and Alta.) Discovery and exploration, Canadian Rockies (B.C. and Alta.) European exploration, Cartographers, Cartographers Canada Biography, Cartographes Canada Biographies, Columbia River, Columbia River Valley Discovery and exploration, Colu

A mathematical boy Lure of the Columbia Rising star The Stoney Mountains An attempt to cross the Rocky Mountains-1801 Across the Divide Rocky Mountain House Height of land Kootanae House Waiting for Ugly Head Winter 1807-08 Among the Kootenai and Salish Trading & discovery-spring 1808 Flooded out Second winter, 1808-1809 Kullyspel House The country before us Saleesh House A more eligible road A critical situation On rotation Athabasca Pass Boat encampment Journey to Spokane House Kettle Falls A voyage down the Columbia Passage to the sea Mr. Astor's company Completing the circle Last winter Legacy The mapmaker Boundaries Travels