The Purpose To get information upon the
  unexplored country extending
  from the interior of
  present Missouri to the
  mouth of the Columbia River
  in present Washington.

The Start At St. Louis, Monday, May
  14, 1804.

The Finish At St. Louis, Tuesday, September
  23, 1806.

Time Consumed Two years, four months, and
  nine days.

Distance Travelled To the mouth of the Columbia:
  4134 miles. Back to
  St. Louis: 3555 miles.
  Counting side trips: 8000
  miles, total.

Methods Employed Boats, horses and afoot.

The Route Up the Missouri River to its
  sources in present Montana;
  across the Bitter Root Mountains
  into present Idaho; by
  way of the Clearwater River,
  the Snake River and the
  Columbia River to the Pacific
  Ocean.

The Party Out of St. Louis Forty-five.

The Party Who Went Through Thirty-three: the two captains,
  twenty-three American
  soldiers, five French-Canadian
  and French-Indian
  boatmen and interpreters,
  one negro servant, one Indian
  woman guide, and one
  baby.

Deaths One.

Seriously Injured One.