Reading every journal at once. What no human has done.
For every date with two or more expedition narrators writing, this database produces a side-by-side analysis comparing what each preserved. Long-form thematic essays trace patterns across years. Every claim cites a specific journal entry. Every analysis is reviewed before publication.
The Silence of Meriwether Lewis: What Clark and the Sergeants Preserved, August 1805–January 1806
For roughly 135 days spanning the Bitterroot crossing, the descent of the Columbia, and the founding of Fort Clatsop, Meriwether Lewis put down his pen. The expedition's most consequential geographic transit survives only through the eyes of Clark, Ordway, Gass, and Whitehouse — a documentary absence that shapes everything we…
Read the analysisFeatured analyses
A curated mix — thematic essays, per-figure deep dives, and rich multi-narrator dates.
Diet Across the Expedition: A Seasonal Analysis
From the bison-rich winter at Fort Mandan to the salmon and wapato of the Pacific coast, the Corps of Discovery's diet shifted dramatically with season, geography, and Indigenous…
Sacagawea: The Shoshone Interpreter of the Corps of Discovery
From her recruitment at Fort Mandan in November 1804 to her family's farewell at the Mandan villages in August 1806, Sacagawea — the young Shoshone wife of Toussaint…
Cameahwait: The Shoshone Chief Who Saved the Expedition
Brother to Sacagawea and chief of the Lemhi Shoshone, Cameahwait provided the horses and guidance without which the Corps of Discovery could not have crossed the Rocky Mountains.
Four Pens at Fort Clatsop: A Sturgeon Sale, Five Elk, and a White-Tailed Hare
On a damp February day at Fort Clatsop, four expedition journalists record the same events with strikingly different priorities — from a Clatsop trader's visit to a meticulous…
Three Registers at Calumet Bluff: Ethnography, Ceremony, and Weather
On the final day of council with the Yankton Sioux, Clark, Gass, and Whitehouse produce strikingly different records of the same event — one ethnographic, one anecdotal, one…
The Sleeping Hunters and the Yellow Clay Cliff
Five narrators recount a single July day on the lower Missouri: a false alarm at dawn, a creek named for a Spaniard's suicide, and a 2,000-acre prairie of…
Northern Lights and Departing Boatmen at the Mandan Winter Camp
On a cold November day at Fort Mandan, three expedition journalists record the departure of interpreter Joseph Gravelines and a small crew bound downriver. Only Clark pauses to…
Twenty-Three Horses and a Departure: Four Voices Leave the Walla Walla
On April 30, 1806, the expedition departed Yelleppit's Walla Walla village with twenty-three horses. Four narrators recorded the day's fourteen-mile march, but their accounts diverge sharply in ethnographic…
Thematic essays
Long-form analyses that cut across many dates — diet, illness, language, weather, copying patterns, naming conventions.
Diet Across the Expedition: A Seasonal Analysis
From the bison-rich winter at Fort Mandan to the salmon and wapato of the Pacific coast, the Corps of Discovery's diet shifted…
Diet Across the Expedition: A Seasonal Analysis
From buffalo feasts on the northern plains to dog meat purchased on the Columbia and elk steaks rationed at Fort Clatsop, the…
Per-narrator studies
One essay for each expedition diarist — their distinctive voice, omissions, recurring themes, and how their writing evolved.
Key figure profiles
AI-assisted biographical syntheses drawn from every entry that mentions each person or nation.
The Lemhi Shoshone: Horse Lords of the Continental Divide
The Lemhi Shoshone — Sacagawea's people — held the keys to crossing the Rocky Mountains. Their horses, geographic knowledge, and a single…
Charles Marion Russell: The Cowboy Artist and the Lewis & Clark Imagination
Charles Marion Russell (1864–1926) does not appear in the Lewis and Clark journals — he was born nearly six decades after the…
The Iowa Tribe in the Lewis & Clark Journals: A Note on Absence
Although the Iowa (Ioway) Nation appears peripherally in the broader ethnographic horizon of the Lewis and Clark Expedition, the corpus of journal…
Sergeant Charles Floyd: The Corps of Discovery’s Only Casualty
Sergeant Charles Floyd, the youngest of the three sergeants and the only member of the Corps of Discovery to die on the…
The Chippewa (Ojibwe) in the Lewis & Clark Record: A Note on Absence
Although the Chippewa (Ojibwe) were among the most populous and consequential Native nations of the Great Lakes and northern plains during the…
The Chinook Nation: First Encounters at the Pacific
When the Corps of Discovery reached the mouth of the Columbia in November 1805, the Chinook were the first nation to greet…
York: The Enslaved Man Who Crossed a Continent
Enslaved by William Clark from boyhood, York walked, paddled, hunted, voted, and traded across 8,000 miles with the Corps of Discovery —…
The Sac and Fox Nation in the Lewis & Clark Record
Although the Sac (Sauk) and Fox (Meskwaki) nations occupied lands along the Mississippi and lower Missouri at the time of the Corps…
Pierre Cruzatte: Fiddler, Waterman, and the Man Who Shot Meriwether Lewis
Half-French, half-Omaha, blind in one eye and nearsighted in the other, Pierre Cruzatte was the Corps of Discovery's most indispensable boatman, its…
The Osage Nation in the Lewis & Clark Journals: A Synthesis
Though no journal entries in our tagged corpus directly reference the Osage Nation, their shadow falls across the early expedition record through…
George Shannon: The Youngest Soldier of the Corps of Discovery
From a starving boy lost on the prairie to a trusted hunter and trader on the return journey, George Shannon's three-year apprenticeship…
Albert Bierstadt: A Painter Beyond the Journals
Albert Bierstadt, the celebrated nineteenth-century landscape painter of the American West, does not appear in the journals of the Lewis and Clark…
Browse by date
853 date-bound analyses, in chronological order.
How these analyses are written
AI-Assisted Each analysis is drafted by Anthropic Claude using only the primary-source journal entries cited within it, then reviewed by a human editor before publication. AI surfaces patterns that single-narrator scholarship cannot — copying lineages, prose-register shifts, side-by-side accounts of the same day from opposite sides of the camp. Every claim must trace to a specific journal entry. We're transparent about the method because we believe it's defensible scholarship, not a substitute for it.