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On this day in Lewis & Clark history...

Clark surveys the Great Falls of the Missouri River. At Upper Portage Camp, the skins covering the iron boat are sealed with a mixture of pounded charcoal, buffalo tallow, and bees wax. Mosquitoes and blow flies pester the men.

From the journals...

A worm morning flying Clouds I deturmin take the width of the river at the falls & the Medison river

William Clark

Rainbow Falls

Large bend in the river and a mostly dry falls

this is an inhabitant of the open plain altogether, wher it burrows and resides; nor is it like the other found among clifts of rocks or in the woodlands. their burrows sometimes like those of the mole run horizontally near the surface of the ground for a considerable distance, but those in which they reside or take refuge strike much deeper in the earth.—

Meriwether Lewis

Thirteen-lined ground squirrel, Spermophilus tridecemlineatus

Thirteen-lined ground squirrel

This image released to the public domain by Kharis.