The stores of the expedition were clothing, working tools, fire-arms, food supplies, powder, ball, lead for bullets, and flints for the guns then in use, the old-fashioned flint-lock rifle and musket being still in vogue in our country; for all of this was at the beginning of the present century.
As the party was to begin their long journey by ascending the Missouri River, their means of travel were provided in three boats.
The largest, a keel-boat, fifty-five feet long and drawing three feet of water, carried a big square sail and twenty-two seats for oarsmen. On board this craft was a small swivel gun.
The other two boats were of that variety of open craft known as pirogue, a craft shaped like a flat-iron, square-sterned, flat-bottomed, roomy, of light draft, and usually provided with four oars and a square sail which could be used when the wind was aft, and which also served as a tent, or night shelter, on shore.
Two horses, for hunting or other occasional service, were led along the banks of the river.
As we have seen, President Jefferson, whose master mind organized and devised this expedition, had dwelt longingly on the prospect of crossing the continent from the headwaters of the Missouri to the headwaters of the then newly-discovered Columbia. The route thus explored was more difficult than that which was later travelled by the first emigrants across the continent to California. That route lies up the Platte River, through what is known as the South Pass of the Rocky Mountains, by Great Salt Lake and down the valley of the Humboldt into California, crossing the Sierra Nevada at any one of several points leading into the valley of the Sacramento. The route, which was opened by the gold-seekers, was followed by the first railroads built across the continent. The route that lay so firmly in Jefferson's mind, and which was followed up with incredible hardships by the Lewis and Clark expedition, has since been traversed by two railroads, built after the first transcontinental rails were laid.
If Jefferson had desired to find the shortest and most feasible route across the continent, he would have pointed to the South Pass and Utah basin trails. But these would have led the explorers into California, then and long afterwards a Spanish possession.
The entire line finally traced over the Great Divide lay within the territory of the United States.
But it must be remembered that while the expedition was being organized, the vast Territory of Louisiana was as yet a French possession. Before the party were brought together and their supplies collected, the territory passed under the jurisdiction of the United States. Nevertheless, that jurisdiction was not immediately acknowledged by the officials who, up to that time, had been the representatives of the French and Spanish governments.
Part of the territory was transferred from Spain to France and then from France to the United States. It was intended that the exploring party should pass the winter of 1803-4 in St. Louis, then a mere village which had been commonly known as Pain Court. But the Spanish governor of the province had not been officially told that the country had been transferred to the United States, and, after the Spanish manner, he forbade the passage of the Americans through his jurisdiction.