History of the Expedition under the Command of Captains Lewis and Clark, Vol. 1.: To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean. Performed During the Years 1804-5-6

In Short

This narrative chronicles the first leg of the transcontinental expedition commissioned by the United States government and led by Captains Meriwether Lewis and William Clark. Beginning at the mouth of the Missouri River in 1804, the volume tracks the party’s ascent of the river, their winter encampment among the Mandan nation, their arduous passage through the Great Falls and the Rocky Mountains, and their descent toward the Pacific watershed.

Written as a detailed daily log, it combines geographical surveys, natural history observations, and ethnographic records with a raw survival story. The book endures because it offers an unvarnished, immediate account of the North American wilderness and its indigenous inhabitants just before widespread European-American settlement altered both forever.

The Story

The expedition sets out from Wood River near St. Louis, pushing heavy keelboats and periogues against the powerful, muddy current of the Missouri. The early months are defined by relentless physical labor: towing craft round rock points, clearing driftwood, and navigating shifting sandbars under a punishing summer sun. As the party moves northward through present-day Missouri, Iowa, and the Dakotas, the landscape opens into vast prairies populated by immense herds of buffalo, fleet antelopes, and dense colonies of burrowing prairie dogs. Along the riverbanks, the captains hold formal councils with various Native nations—including the Ottoes, Sioux, and Ricaras—distributing medals, establishing trade intentions, and attempting to mediate intertribal feuds.

By late autumn of 1804, the air turns bitter and floating ice begins to choke the river. The party reaches the villages of the Mandan and Minnetaree nations in modern-day North Dakota. Here they construct Fort Mandan, a wooden stockade where they spend a severe winter marked by temperatures plunging far below zero. Despite the harsh climate, the party maintains warm relations with the Mandans, participating in local hunts, watching native dances, and relying heavily on the blacksmith's skill to forge iron tools and scrapers in exchange for corn and squash. During this winter, they secure the services of Toussaint Charbonneau and his Shoshone wife, Sacajawea, who gives birth to a son at the fort.

With the spring thaw of 1805, the ice breaks up, and the main party proceeds westward into country previously untraveled by white explorers. Pushing deeper into present-day Montana, they reach the confluence of the Missouri and Yellowstone rivers, encountering abundance of game alongside constant hazards—grizzly bears, violent dust storms that blind the men and ruin their instruments, and treacherous river rapids. In June, they encounter the Great Falls of the Missouri, a breathtaking series of cataracts that forces a grueling, weeks-long portage. The men haul their heavy baggage and canoes over rough, cactus-strewn terrain on makeshift wooden wagons, their feet bruised and torn by prickly pears.

Above the falls, the river narrows into dark mountain chasms, including the formidable canyon they name the Gates of the Rocky Mountains. The water becomes shallow and swift, forcing the men into the freezing stream to haul the canoes over jagged stones by hand. Realizing the river is no longer navigable and that winter is approaching, Lewis scouts ahead on foot to locate the Shoshone Indians, hoping to procure horses to cross the continental divide.

Lewis successfully makes contact with Chief Cameahwait’s band of Shoshone. In a crucial turn of fortune, Sacajawea recognizes Cameahwait as her brother, smoothing negotiations. The expedition trades merchandise for horses and hires a guide to navigate the treacherous Lemhi and Bitterroot ranges. The mountain passage proves to be the most grueling trial of the journey. Snowstorms cover the faint Indian trails, fallen timber obstructs their path, and game disappears entirely. Starving, freezing, and suffering from exhaustion, the men are forced to kill their own colts for food and melt snow for water.

Emerging at last on the western side of the mountains, they reach the plains of the Chopunnish (Nez Perce) nation, battered and weakened. After recovering their health on a diet of salmon and camas roots, they build new timber canoes and launch onto the rapid waters of the Clearwater and Snake rivers, sweeping down toward the Columbia River and their ultimate goal: the Pacific Ocean.

How It Unfolds

The voyage begins Setting off from Wood River, the party struggles up the Missouri River, fighting rapid currents, concealed timber, and shifting sandbars. The leaders record the terrain, regional flora, and abundance of wildlife while distributing mosquito nets to protect the crew.

Councils on the plains Ascending into Sioux and Ricara territory, the party sets the prairies on fire to signal nearby tribes for diplomatic meetings. They hold formal councils, observe native customs, and document the ruined earth-walled fortresses of displaced nations.

Winter at Fort Mandan Trapped by river ice and sub-zero cold, the expedition builds a timber fort near the Mandan and Minnetaree villages. They trade blacksmith work for provisions, navigate British fur-trade rivalries, and learn local geography from native informants.

Into the unknown As the spring ice breaks, the party sends the heavy barge back toward St. Louis and pushes west in smaller canoes past the Yellowstone River. They encounter vast herds of buffalo, fight blinding sandstorms, and suffer from infected eyes and spoiled equipment.

Portage at the Great Falls Reaching a series of massive cataracts, the expedition is forced to construct crude wooden carts to transport their boats and baggage overland. Extreme heat, violent windstorms, and fields of prickly pear cacti make the physical labor agonizing.

The mountain barrier Ascending past the Gates of the Rocky Mountains, the Missouri becomes too shallow and swift to paddle, forcing the crew to tow boats on foot through cold water. Lewis searches ahead on land, eventually locating the Shoshone tribe to buy pack horses for the mountain pass.

Crossing the divide Guided by the Shoshone across snow-bound Rocky Mountain ridges, the men face starvation, freezing weather, and dangerous, slippery trails. With game unavailable, they survive by slaughtering several of their pack horses before reaching the Nez Perce plains.

The People

• Meriwether Lewis: The co-leader of the expedition, who acts as the chief administrator, naturalist, and diplomatic strategist. Driven by scientific curiosity and an intense sense of duty to his nation, Lewis constantly seeks to map the terrain, catalog new flora and fauna, and make peaceful contact with western tribes. He routinely ranges ahead on foot, enduring severe physical hardship, hunger, and life-threatening terrain to scout routes and secure vital alliances.
• William Clark: The practical co-commander, expert cartographer, and river navigator. Clark manages the daily logistics of moving boats, setting up camps, and directing the crew through hazardous waters. He is focused on the immediate survival and health of the men, frequently hunting to supply food, treating injuries, and maintaining steady discipline under brutal physical stress.
• Sacajawea: A young Shoshone woman captured in her youth by the Minnetaree, who accompanies the expedition alongside her husband, Charbonneau, and her infant son. She wants to return to her native people in the west. Her presence serves as a peaceful signal to tribes who would otherwise view an armed party with suspicion, and her reunion with her brother, Cameahwait, proves essential in securing the horses needed to cross the Rockies.
• Cameahwait: A Shoshone chief who faces the daunting task of keeping his impoverished, horse-rich tribe fed and protected from hostile neighboring nations. Hesitant and cautious when first approached by white strangers, he eventually forms a warm, trusting bond with Lewis and Clark, supplying crucial pack animals, guides, and geographic advice.

In Its Own Voice

"The acuteness of their sight distinguishes the most distant danger, the delicate sensibility of their smell defeats the precautions of concealment, and when alarmed their rapid career seems more like the flight of birds than the movements of an earthly being."

This entry captures Captain Lewis’s precise observation of the pronghorn antelope along the Missouri River plains, reflecting both scientific interest and genuine wonder at the unfamiliar wildlife.

"Our poor Indian woman, who had recovered so far as to walk out, imprudently ate a quantity of the white apple, which with some dried fish occasioned a return of her fever."

Recorded during the tense preparations at the Great Falls, this passage illustrates the constant medical anxieties surrounding Sacajawea and her vital role within the party.

"We were all very wet, cold, and hungry: but although before setting out this morning, we had seen four deer, yet we could not procure any of them, and were obliged to kill a second colt for our supper."

Written in the depths of the snowbound Rocky Mountains, this entry underscores the stark reality of the expedition’s desperation as basic survival took precedence over all else.

What It's Really About

Beneath the central narrative of geographic discovery lies a record of encounters between two vastly different worlds. The book functions as a detailed inventory of an intact wilderness, cataloging ecosystems, river systems, and wildlife populations before European-American expansion reshaped them.

At the same time, the journal reveals the complex political and social dynamics of the native nations inhabiting the Missouri and Columbia basins. Far from being an empty wilderness, the West is depicted as a network of sovereign nations engaged in trade, diplomacy, and warfare. The narrative exposes the strategic motivations of both the American government seeking territorial dominance and the tribal leaders attempting to secure trade advantages, iron tools, and firearms for their people's survival.

Why Read It Today

This volume appeals to readers who enjoy authentic survival literature, early American history, and natural history. Reading it feels like sitting over a field desk illuminated by campfire light; the prose is direct, unvarnished, and rich with immediate detail. Rather than a smoothed-over history written long after the fact, it offers the unfiltered rhythm of the trail, where a day’s success is measured in miles poled against a current, deer shot for supper, or a dry place to pitch a tent.

The narrative does present real challenges for the modern reader. The text includes obsolete nineteenth-century spellings, meticulous geographical measurements, and repetitive daily logs that reflect the tedious reality of wilderness travel. Furthermore, the period attitudes of the writers toward Native Americans reflect the imperial biases of early nineteenth-century America. Yet, despite these obstacles, the core narrative retains a gripping human momentum. The sheer grit of the party, combined with the awe of encountering an unmapped continent, creates an unforgettable reading experience that stays with you long after the journey over the mountains is complete.