when was the lewis and clark expedition
The Lewis and Clark Expedition took place from 1804 to 1806.
Led by Meriwether Lewis and William Clark, it was commissioned by President
Thomas Jefferson shortly after the Louisiana Purchase to explore the newly
acquired western territories and find a route to the Pacific Ocean.
Key Timeline
This epic journey covered over 8,000 miles round-trip, facing harsh winters, rugged mountains, and encounters with Native American tribes. Here's a breakdown of the major phases, drawn directly from historical records:
| Phase | Dates | Key Events |
|---|---|---|
| Preparation & Departure | 1803–May 1804 | Lewis gathers supplies; expedition leaves Camp Dubois, Illinois, on May 14, 1804, heading up the Missouri River. Clark joins with the full Corps of Discovery, including York (Clark's enslaved companion). |
| Westward Ascent | June 1804–Nov 1805 | They winter at Fort Mandan (1804–05) with Sacagawea and her husband; cross the Continental Divide via Lemhi Pass; reach the Pacific Ocean by November 1805 after navigating the Columbia River. |
| Return Journey | March–Sept 1806 | Depart Fort Clatsop, Oregon, on March 23; reunite after splitting to explore tributaries; arrive back in St. Louis on September 23, 1806. |
Why It Matters
Imagine setting out in wooden boats and on foot into uncharted wilderness—no GPS, limited supplies, and constant threats from weather and wildlife. The expedition mapped rivers, documented 178 plants and 122 animals new to science, and fostered diplomacy with over two dozen tribes, paving the way for American westward expansion.
Sacagawea's role as interpreter and guide was pivotal, especially in the Rockies, while the group's diversity (soldiers, civilians, enslaved York) highlighted early American multiculturalism. Their journals, totaling millions of words, remain a treasure trove for historians.
Fun Fact: Near-Misses
- Starved nearly to death in the Bitterroots, surviving on "portable soup" (dried meat paste).
- Only one death (enlisted man Charles Floyd from illness in 1804).
- A tense Blackfeet skirmish in 1806 marked their sole violent clash.
TL;DR: May 14, 1804–September 23, 1806—a 2+ year odyssey that shaped the U.S.
Information gathered from public forums or data available on the internet and portrayed here.