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On this day in Lewis & Clark history...

Clark records a temperature of 8° below 0. The Missouri River, which joins the Mississippi across from their winter camp on the Wood River, runs with ice.

From the journals...

a verry Cold morning, at 7 oClock the Thermometer in the air fall 8° below, 0,
a verry Cold night; the Missouris has fallen to day about 6 Inches, runs with Ice— Ice from Shore 20 yds in the river is 5½ Inches Thick—

William Clark

Survey chain

Historical painting of William Clark

Photo taken with permission at Fort Mandan.