Flathead House

By editor

Near Plains, Sanders County, Montana

By the 1810s the Hudson’s Bay Company dominated northwestern Montana’s fur trade, bartering with Kootenai, Pend d’Oreille, and Salish people. In 1812 the company built a post on the Clark Fork near the Thompson River’s mouth, then relocated by the early 1820s to a more accessible site near present Plains. Flathead House—two dwellings, a store, a horse corral—anchored lower Clark Fork trade for more than twenty years. The 1846 Oregon boundary settlement pushed the British out; the post closed in 1847.

The day that haunted company men came earlier. In November 1824, Jedediah Smith and seven American companions walked into Flathead House. HBC policy under John McLoughlin had worked for years to keep American trappers out of the Oregon country west of the Divide, stripping beaver as a buffer. Manager Peter Skene Ogden called Smith’s arrival “that damn’d all cursed day.” An American mountain man at the gate meant the monopoly strategy had failed.

The marker near Plains commemorates a small post with a large geopolitical shadow—the place where British fur-trade ambition met the first hard evidence that Americans would not stay east of the mountains.