No roads, no maps, no known sources of supplies.
He made detailed maps
The Rocky Mountains and the Columbia River would have presented major obstacles to the Lewis and Clark expedition. The rugged terrain and the swift currents would have made travel difficult and dangerous for the explorers.
Lewis and clark
The Rocky Mountains and the Columbia River posed significant challenges for the Lewis and Clark expedition. The rugged terrain of the Rockies made for difficult passage, while navigating the turbulent waters of the Columbia River required skill and endurance.
Clark. He made the maps and directed the boats.
Contrary to popular belief, the expedition DID NOT begin in St. Louis, Missouri. The first entry in the Lewis and Clark Expedition Journals state that the journey began in Pittsburgh, PA on August 30, 1803. Lewis, who had been assigned by Jefferson sailed down the Ohio River with supplies towards St. Louis. William Clark would offer to join Lewis on the expedition weeks later on October 13, 1803 at Camp Dubois (in present-day Indiana). Provided below is a link to the first journal entry of the Lewis and Clark expedition where you can read about how Lewis bought an air gun that accidentally went off and made a poor woman faint. Also, you can read about how difficult it was to travel along the Ohio River.
China
The Rocky Mountains Great Plains and Indian Sacagewea
A group expedition is an excursion, journey, voyage or undertaking made for some specific purpose by a group of people. For example, Lewis and Clark embarked on a group expedition to explore the territory west of the Mississippi River.
Meriwether Lewis who had been appointed to the rank of Captain, was designated as the expedition "scientist". Prior to the expedition, Lewis went to Philadelphia for intense training by physician Benjamin Rush, astronomer-surveyor Andrew Ellicott, botanist Benjamin Barton, anatomist Casper Wister, and mathematician Robert Patterson. For three months he was tutored in the spring of 1803. The skills that Lewis learned would be passed on to Clark as they traveled. Prior to the expedition, Clark was in fact Lewis' superior officer and was very experienced in handling boats. Clark had rounded up some men from the mountains to help on the expedition.
Meriwether Lewis who had been appointed to the rank of Captain, was designated as the expedition "scientist". Prior to the expedition, Lewis went to Philadelphia for intense training by physician Benjamin Rush, astronomer-surveyor Andrew Ellicott, botanist Benjamin Barton, anatomist Casper Wister, and mathematician Robert Patterson. For three months he was tutored in the spring of 1803. The skills that Lewis learned would be passed on to Clark as they traveled. Prior to the expedition, Clark was in fact Lewis' superior officer and was very experienced in handling boats. Clark had rounded up some men from the mountains to help on the expedition.
The Chinook Indians fed and housed the Lewis and Clark over the winter of 1805/6. With out the Chinook's help Lewis and Clark may not have made it back to their homes.