1770-1857

In the late 1840s, explorer David Thompson wrote a journal of his travels over the past half century. He appended a summary of his career to his entry for July 14, 1811:

Thus I have completed the survey of this part of North America from sea to sea, and by almost innumerable astronomical observations have determined the positions of the mountains, lakes, and rivers, and other remarkable places on the northern part of this continent, the maps of all of which have been drawn, and laid down in geographical position, being now the work of twenty seven years.

He chose an appropriate date for his laudatory self-assessment. He had just led the first party down the entire length of the Columbia River.

Thompson was born in London in 1770. His father died when he was two, leaving his mother to raise him. At age seven Thompson entered a London charity school. There he studied mathematics, hoping to enter the British navy. The 1783 Treaty of Paris resolved the conflict among the United States, France and Britain, which resulted in the reduced need for naval recruits; therefore, the school instead apprenticed Thompson to the Hudson's Bay Company as a clerk. He left London in 1784 at the age of 14, bound for Fort Churchill on Hudson Bay. For the next three years Thompson served as a clerk at various posts on Hudson Bay. Then, in 1787 the company sent him inland to Cumberland House in what is now Saskatchewan. Thompson began to map the surrounding area in 1789 and two years later received informal training in astronomy from Phillip Torner, a Hudson's Bay Company surveyor. In 1799 Thompson married Charlotte Small. He was twenty-nine. She was the fourteen year old daughter of an Indian woman and North West Company partner. The two had thirteen children.

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From 1793 to 1796, Thompson surveyed northern Saskatchewan. In 1796, the Hudson's Bay Company asked Thompson to stop surveying and dedicate more energy to procuring furs. As his third term of service with the company expired in 1797, Thompson joined the rival North West Company. Over the next two years, he explored present day Manitoba and Saskatchewan, traveling as far south as the source of the Mississippi and the Mandan villages on the Missouri. Over the course of the next twelve years (1799-1811), Thompson explored the Rocky Mountains, establishing a new route to Lake Athabasca and two new routes over the Rocky Mountains. He also surveyed the Columbia River from its source in present day British Columbia to its mouth on the Pacific coast. Thompson had hoped to establish a fur post at the mouth of the river, securing the first navigable route between Lake Athabasca and the Pacific Ocean, but he found that John Jacob Astor's Pacific Fur Company had already established Fort Astoria.

Thompson returned east in 1812, settling near Montreal. In 1814 he delivered a map of western Canada to the North West Company. From 1816 to 1826, Thompson served as a member of the boundary commission surveying the international border south of Ontario. In 1843, he published two additional maps of the Northwest. Between 1846 and 1850, Thompson wrote an account of his travels. He died in 1857 having covered some 80,000 miles on foot, on horseback and by canoe in sixty years of exploring and surveying.