Bitterroot Mountain Range
Idaho has a much higher average elevation than Mississippi, as it includes the Bitterroot Range and the Salmon River Mountains
The Bitterroot Mountains, including the Bitterroot Valley. The mountains were snow covered and could only be crossed during spring and summer months.
Near the Cascades, in the American Rockies.
Anything that they could find
It is the 70-mile-long by 15-miles-wide Bitterroot Valley with the Sawtooth Mountains at the southern end, Bitterroot Mountains to the west, and the Sapphire Mountains to the east.
Bitterroot range
The Rocky Mountains also, Mount Jefferson, Mount St. Hellens, Mount Rainier, Mount Hood, and Mount Adams.
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Lewis and Clark had to travel over the Rocky Mountains during their expedition. They crossed the Bitterroot Range in present-day Montana and Idaho, encountering rugged terrain and harsh weather conditions along the way.
Lewis and Clark crossed the Bitterroot Mountains in search of a navigable water route to the Pacific Ocean as part of their expedition exploring the newly acquired Louisiana Territory. They hoped to find an easier passageway through the mountains to continue their journey westward.
There are 14 mountain ranges found in Idaho. These include the Albion Mountains, the Bally Mountains, the Elk Mountains, the North Hansel Mountains, and the Samaria Mountains.