Siskiyou Trail
The Siskiyou Trail stretched from California's Central Valley to Oregon's Willamette Valley; modern-day Interstate 5 follows this pioneer path. Originally based on existing Native American foot trails winding their way through river valleys, the Siskiyou Trail provided the shortest practical travel path between early settlements in California and Oregon.
Development
The earliest European or American visitors along the Siskiyou Trail were likely hunters and trappers connected with the Hudson's Bay Company (HBC) who, in the 1820s, began to travel the rivers of Southern Oregon and Northern California in search of fur and pelts.
The HBC had established itself on the Columbia River, and built Fort Vancouver, its regional headquarters in 1824. HBC parties began to explore south toward California in 1825. Alexander McLeod led exploration and trapping parties south beginning in 1826, reaching the Klamath River in 1827, and the Sacramento River in 1828. In 1829 he led the first HBC trapping expedition to the Sacramento Valley, which allowed later expeditions to reach as far south as French Camp near today's Stockton.
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