The steamboat Yukon was the first paddlewheeler to venture up the Yukon River. It was July 5, 1869, shortly after the Alaska Territory was bought by the United States from Russia. In part, the trip was a reconnaissance mission, but it was also a supply mission for the Alaska Commercial Company, which took over the trade route from the Hudson Bay Company.
By 1885, when gold was discovered on the Fortymile River, there were three steamers working the river. With the discovery of gold in the Klondike, as many as 100 steamers entered the Yukon River at St Michael to make the trip to Dawson City in the Yukon Territory.