While winter camp on the Wood River across from the mouth of the Missouri is constructed, Clark takes the noon altitude of the sun to determine the accuracy of his chronometer and sextant. In Cahokia, Lewis writes a letter to President Thomas Jefferson with information about the Louisiana Territory.
Wood River
Photographer and date unknown.
Wood River Observations
Took the me[ridian?] altitude of the Suns Lowr Limb with the Sextent found it to be 56° 15′ 22″, The Chronomter too Slow about 24′ 20″— I also took the median altitude of the Suns Lowr limb with the quadt and found 52° 57m 0 the errour of the instrument is 1° 20′ 00″ + ad +
—William Clark
Collecting Louisiana Information
Cahokia December 28th 1803.
Dear Sir [Thomas Jefferson],
On my arrival at St. Louis, the first object to which, I called my attention, was that of collecting such information as might be in some measure serviceable to you in forming your opinions, or shaping your arrangements to effect a certain point of policy
MERIWETHER LEWIS. CAPT.
1st. U.S. Regt. Infty.[1]Lewis to Jefferson. Donald Jackson, ed. Letters of the Lewis and Clark Expedition with Related Documents: 1783-1854, 2nd ed. (Urbana: University of Illinois Press, 1978), 148.
Winter Camp at Wood River (Camp Dubois) is a High Potential Historic Site along the Lewis and Clark National Historic Trail managed by the U.S. National Park Service. The site, near Hartford, Illinois, is managed as Lewis and Clark State Historic Site and is open to the public.
In present St. Louis, the Jefferson National Expansion Memorial “commemorates Thomas Jefferson’s vision of the continental expansion of the United States” and is a High Potential Historic Site along the Lewis and Clark National Historic Trail managed by the U.S. National Park Service.
Notes
| ↑1 | Lewis to Jefferson. Donald Jackson, ed. Letters of the Lewis and Clark Expedition with Related Documents: 1783-1854, 2nd ed. (Urbana: University of Illinois Press, 1978), 148. |
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Discover More
- The Lewis and Clark Expedition: Day by Day by Gary E. Moulton (University of Nebraska Press, 2018). The story in prose, 14 May 1804–23 September 1806.
- The Lewis and Clark Journals: An American Epic of Discovery (abridged) by Gary E. Moulton (University of Nebraska Press, 2003). Selected journal excerpts, 14 May 1804–23 September 1806.
- The Lewis and Clark Journals. by Gary E. Moulton (University of Nebraska Press, 1983–2001). The complete story in 13 volumes.
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Unless otherwise noted, journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton, 13 vols. (Lincoln: University of Nebraska Press, 1983-2001).