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On this day in Lewis & Clark history...

The Missouri River ice begins to break away, and the new canoes up the river from Fort Mandan are nearly swept away. Lewis makes observations with his chronometer, circumferentor and sextant.

From the journals...

2 men Set at making a Stearing oar for the Big Barge &.C. others Shelling corn &.C.

John Ordway

Keelboat

The stern of a keelboat with rudder and steering oar

This photo is provided as a service by the U.S. Army Center of Military History.