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May 20, 1804

Lewis leaves St. Louis to join the Expedition men who are waiting for him at St. Charles on the Missouri River. Several of the men attend a Catholic mass.

This day several of our party went to the Chapel, where Mass was said by the Priest, which was a novelty to them.—

Joseph Whitehouse
Historical painting of a Catholic priest

May 20, 1805

The Expeditions travels seven miles up the Missouri reaching the southern tip of present UL Bend National Wildlife Refuge in Montana. They name one stream Blowing Fly Creek, one the Musselshell River, and another is named Sacagawea River.

muscle Shell River falls in on Lard Side 2270 miles up    Contains a greater perportion of water than Rivers of its Size below, I measured it and find it to be 110 yards wide, the water of a Greenish yellow Colour, and appers to be navagable for Small Craft

William Clark
Small river with green riparian area

May 20, 1806

During the night, the Captains find that their shelter does not shed the rain. On the plains above Long Camp, the hunters encounter fresh snow. The men remove the brass buttons from their clothes to trade for food.

at 2 P. M. Labuish arrived with a large buck of the Mule deer speceis which he had killed on Collins's Creek yesterday. he had left Cruzatte and Collins on the Creek where they were to wait his return.

Meriwether Lewis
Mule deer buck on the Lolo Trail