Flows W from Kamloops, then S and W into Fraser River at Lytton
50.2353 N 121.5667 W — Map 92I/4 — Google — GeoHack
Earliest known reference to this name is 1808
Name officially adopted in 1925
Official in BC – Canada
John Arrowsmith’s map BC 1859
Milton and Cheadle’s map 1865
Trutch’s map of BC 1871
Thompson, a charity pupil at Grey Coat School, London, was apprenticed to the Hudson’s Bay Company [1670–] in 1784. He joined the North West Company as a surveyor in 1797. In 1811 he explored the length of Columbia River, crossing the Continental Divide via the Athabasca Pass.
Thompson was a member of the British-American Boundary survey from 1815 to 1824. Thompson died of poverty at Longuineil, Quebec, in 1857, age 87. He was never on any of the three Thompson Rivers.
- Fraser, Simon [1776–1862]. The letters and journals of Simon Fraser, 1806-1808. Edited by W. Kaye Lamb. Toronto: MacMillan, 1960. Internet Archive
- Arrowsmith, John [1790–1873]. Provinces of British Columbia and Vancouver Island; with portions of the United States and Hudson’s Bay Territories. 1859. UVic
- Trutch, Joseph William [1826–1904]. Map of British Columbia to the 56th Parallel North Latitude. Victoria, B.C.: Lands and Works Office, 1871. University of Victoria
- Nesbit, Jack [1949–]. Mapmaker’s Eye: The Mapmaker’s Eye: David Thompson on the Columbia Plateau. Pullman: Washington State University Press, 2006
- British Columbia Geographical Names. Thompson River