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On this day in Lewis & Clark history...

Many of the men see their first hoar frost—a thick frost that covers the ground and tree branches. The men coat the Fort Mandan log walls and chinking with clay. They also raise the walls for the provision room and smokehouse.

From the journals...

the air verry thick with fogg from the R.

John Ordway

Foggy Missouri River

Foggy Missouri River in early morning