On the Trail

July 21, 1803

U.S. Army headquarters

Lewis is at U.S. Army headquarters in Pittsburgh, Pennsylvania overseeing the building of the expedition's military barge and waiting for supplies and personnel to arrive. Fellow visitor Thaddeus Harris describes the fort.

July 21, 1804

Passing the Platte

At midday, the expedition arrives at the mouth of the Platte where they remark on the sandy river's effect on the Missouri. Before continuing, the captains take a pirogue one mile up the Platte and confirm that the river cannot be navigated with boats or canoes.

July 21, 1805

Slow and laborious

In present Helena Valley, Clark's group scouts ahead in search of Shoshones. His party's feet are so bruised and cut they must come back to the river and wait for Lewis. The enlisted men move the boats 15 miles up the Missouri, and Seaman catches several geese.

July 21, 1806

Missing horses

On this day, the expedition is split into three detachments separated by 200 miles. At Clark's Yellowstone canoe camp near present Laurel, Montana, the group wakes to find several horses are missing—likely stolen by Apsáalooke (Crows). Pvt. Gibson's wound is healing, and one dugout canoe is nearly ready. On the Marias River, Lewis and his small group turn up Cut [...]

Two army officers at Harpers Ferry ponder an iron frame in the shape of a large canoe

Eastern Beginnings

10 January–30 August 1803

The Lewis and Clark Expedition ostensibly began in February 1801 when President Thomas Jefferson wrote a letter to Army commander General James Wilkinson requesting that Lieutenant Meriwether Lewis become the President’s personal secretary. Exploration of North America’s western half had long been a goal of the president, and now he had a young protégé who might lead such an expedition.

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Five men and a large dog atop a hill above the Missouri River

Past the Omahas

21 July–20 August 1804

Following the Missouri River north along the present Nebraska-Iowa border, the expedition passes the homelands of the Otoes and Omahas. The captains pay their respects to the late Omaha Chief Blackbird and conduct their first two councils, one with the Otoes and another with the Omaha.

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Cliffs rising above a blue river

Gates of the Rockies

13 July–17 August 1805

Above the Great Falls of the Missouri, the expedition continues up the Missouri River in eight dugout canoes. There, the river flows along and through the eastern arms of the Rocky Mountains. Clark lists each river constriction as a gate, gap, or narrow.

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Clark and men lead several horses on the rocky shore

Clark on the Yellowstone

15 July–11 August 1806

Having traveled up the Gallatin River and over Bozeman Pass, Clark, York, the Charbonneau family, and eight enlisted men arrive at the Yellowstone River near present Livingston, Montana.

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Expansive badland view of the Two Medicine River from a high bluff

Lewis on the Marias

16 July–11 August 1806

Lewis can’t leave finding the source of the Marias River alone. If it comes from the far north, then that region will be considered part of the Louisiana Territory. With only three men, Lewis risks traveling through Blackfeet homelands to find the river’s source.

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Featured Members

    François Labiche

    Private

    Labiche performed all the regular duties of an army private, but also performed well as a French and English interpreter. He would continue serving as an escort with Lewis for Chief Sheheke’s delegation to Washington City.

    Peter Weiser

    Private

    Weiser was a member of Sgt. John Ordway’s detachment that paddled the canoes back to the Great Falls. During the 1806 portage around the Falls of the Missouri, he suffered a disabling accident.

    Reubin Field

    Private

    Reubin and his brother Joseph (about a year older) were among the best hunters, but Reubin was possibly the better shot. He was, at least, at Camp Dubois on 16 January 1804, when Clark’s men set up a shooting match with some local residents.

Quick Links

Meriwether Lewis William Clark Sacagawea York Jean Baptiste Charbonneau Seaman All Members

Featured Artist: Alfred Jacob Miller

John Mix Stanley Chromo Lithograph of the Bears Tooth

Pierre and the Buffalo in Jean Baptiste, Mountain Man.

Watercolor of a Shoshone warrior standing if front of an encampment

Snake Indian Camp in August 19, 1805.

Two Indians on horseback, one leaning far back

Blackfeet on the Warpath in The Blackfeet Confederacy

Miller’s reputation rests on his single Green River Rendezvous trip from which he transformed his original sketches and notes into a lifetime of images. His work preserves details of clothing, equipment, camps, transport, and performance. At the same time, his images were made for patrons who valued romance and spectacle. For that reason, Miller should be read carefully.

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    Legacies

    Legacy is a very slippery sort of term. If we could erase our myth concepts of Lewis and Clark … it might reawaken something really extraordinary in our national consciousness.

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    Hunting and Fishing

    Although hunting and fishing were often considered a ‘gentleman’s sport’ especially in Europe, hunting and fishing for Native Americans and Americans alike were a matter of survival. The success of the Lewis and Clark Expedition depended on the success of its hunters.

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    The Arts

    Because of the literate journalists, historians and visual artists can tell the Expedition’s story. When they celebrated with song and dance, we too can share in the experience.

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    Horse Travel

    To cross the Rocky Mountains, the Lewis and Clark Expedition needed horses and the skills to manage them. Despite their seemingly constant struggle to find missing and stolen horses, as a kind of calvary unit, they left hoof prints on approximately 1,500 miles of western terrain.

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    Calendar

    Expedition Calendar

    Links to every day-by-day page in a calendar format spanning 31 August 1803 to 26 September 1806. A page every day!

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    Louisiana’s Purchase

    The President’s representatives in Paris had bargained successfully with Napoleon’s bureaucrats not only to buy the port of New Orleans, then the keystone of the continent, but also to acquire, at three cents an acre, an area extending from the Mississippi River to . . . where? No one knew until Meriwether Lewis stood at the crest of the Rocky Mountains at a place known today as Lemhi Pass, on 12 August 1805.

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    Native American Nations

    The Lewis and Clark Expedition benefited from the Indians’ knowledge and support. Maps, route information, food, horses, open-handed friendship—all gave the Corps of Discovery the edge that spelled the difference between success and failure.

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    The Fur Trade

    Given President Jefferson’s directive to establish commerce, the captains worked extensively within a long-established network of North American fur trade. Part of their mission was to help establish the United States of America’s position within that industry.

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    The Boats

    Starting at Pittsburgh, traveling to the Pacific Ocean, and then returning to St. Louis, the Lewis and Clark Expedition traveled approximately 10,600 miles. Of that, 85%—over 9,000 miles—was by boat. To understand travel in the early 1800 American West is to understand the boats and challenges of river navigation.

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    The Trail

    Starting with its genesis in Jefferson’s Monticello, Lewis’s training and preparations in Philadelphia, and the barge’s excursion down the Ohio River, the route they took, often called the Lewis and Clark Trail, crosses the continent weaving an epic tale of western exploration treasured by many today.

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    People

    The success of the Lewis and Clark Expedition was due to its many members and the people they met, including politicians, Eastern gentleman scientists, traders, and the many people already living in the American west.

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    Medicine on the Trail

    From major crisis such as the death of Sgt. Floyd, Lewis’s gunshot wound, and the illness of Sacagawea to minor events such as sexually transmitted diseases, mosquito-born illnesses, and deep cuts, the medical aspects of the Lewis and Clark Expedition provide an interesting topic of study.

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Experience the Lewis and Clark Trail

The Lewis and Clark Trail Experience—our sister site at lewisandclark.travel—connects the world to people and places on the Lewis and Clark Trail.

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Discover More

  • The Lewis and Clark Expedition: Day by Day by Gary E. Moulton (University of Nebraska Press, 2018). The story in prose, 14 May 1804–23 September 1806.
  • The Lewis and Clark Journals: An American Epic of Discovery (abridged) by Gary E. Moulton (University of Nebraska Press, 2003). Selected journal excerpts, 14 May 1804–23 September 1806.
  • The Lewis and Clark Journals. by Gary E. Moulton (University of Nebraska Press, 1983–2001). The complete story in 13 volumes.