To Missouri's great fortune, Lewis and Clark started measuring their course
and distance at the mouth of the Ohio River thus giving us empirical information
on their progress. There were 70 outward-bound (1803-1804) campsites adjacent
to or within the present state of Missouri. 51 of these sites were calculated to
fall within the present boundaries of Missouri with 9 in Illinois, 7 in Kansas,
and 3 in Nebraska. There were 15 homeward-bound (1806) campsites. 14 of these fall within present day Missouri and 1 is in
present day Nebraska.
The locations of these sites were deduced after plotting the course
and islands of the old Missouri and Mississippi Rivers using the early U.S.
General Land Office (GLO) surveyor field notes and plat maps and then implementing
the course-and-distance numbers from the Corps of Discovery field notes and
Quite pleasingly, the Lewis and Clark navigational information did
fit well within that of the surveyor data with very few exceptions
that were resolved from the old surveyors dutiful noting of previous
old river courses, sloughs, etc. So, depicted here are campsite maps
as accurate as yesterday's information and today's technology can