Geology Along the Lewis & Clark Trail

Geologic Points of Interest

Headwaters of the Missouri

At Lemhi Pass in the Beaverhead Mountains, the Corps of Discovery found the spring that represented the headwaters of the Missouri River (A). At the crest of the Lemhi Pass the Corps would pass into the Pacific drainage, and 3/4 of a mile down the mountain Lewis would "taste from the water" of the great Columbia River (B). Their trail is marked by arrows. (Lewis, 8/12/1805)

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