Headwaters are Columbia Lake at Canal Flats
48°59’59” N 117°37’56” W — Map 82F/4 — Google — GeoHack
Earliest known reference to this name is 1792.
Name officially adopted in 1910. Official in BC — Canada
Elevation: 3747 m
Adopted in the 9th Report of the Geographic Board of Canada, 30 June 1910, as named on maps and charts since 1795.
Called Oregon River by Jonathan Carver, 1766. Called Rio de San Roque by Bruno Heceta, who discovered the river’s mouth in 1775, and so-labelled on Spanish charts.
Named Columbia River in 1792, by Captain Robert Gray of Boston, after his ship Columbia, which entered the mouth of the river in May of that year. In turn, the name of Gray’s vessel honours Christopher Columbus, who reached the Americas in 1492.
The name appear on the 1859 Arrowsmith map.