The Bitterroot Mountains are a small spur range of the Rocky Mountains; they run along the border of Montana and Idaho. The mountains were the area of Lewis and Clark's crossing of the Rocky Mountains and provided the most difficult terrain encountered by the expedition. The lack of game or other food, the lack of forage, and the rocky, freezing terrain made both the east-to-west and the return west-to-east passages miserable and dangerous.
The major drainage route of the Northwest United States and British Columbia, the Columbia is the largest river flowing into the Pacific Ocean from the Western Hemisphere. Jefferson mistakenly believed that the navigable headwaters of the Columbia originated in close proximity to the navigable headwaters of the Missouri—he hoped to discover an all-water route linking the coasts of the continent......
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