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.
Parting at Travelers’ Rest: Four Voices on a Pivotal Division
On the day the Corps of Discovery split into two reconnaissance parties at Travelers' Rest, four journalists recorded the same departure with strikingly different emphases — from Lewis's…
A Storm-Bound Fort and the First Sketch of the Eulachon
Pinned at Fort Clatsop by violent weather, the captains turn inward to natural history. Clark devotes his page to a remarkable small fish brought by the Clatsops, while…
Two Calamities on the Missouri: The Grizzly and the Pirogue
On a single afternoon in May 1805, the Corps of Discovery faced a wounded grizzly and a near-capsized pirogue carrying their most precious cargo. Four narrators record the…
Two Camps, Two Stories: Diverging Paths on the Clearwater Descent
On September 21, 1805, the expedition's narrative splits in two. Lewis and his party push starving through fallen timber while Clark, days ahead, sits with a Nez Perce…
Three Views from Fort Mandan: Dancing, Diplomacy, and Stolen Horses
On a temperate December day at Fort Mandan, three expedition journalists record strikingly different scenes — Gass dances with villagers, Clark logs a Northwest Company trader's news of…
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.
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 Pawnee Nation: A Distant Presence in the Expedition’s Record
Though the Corps of Discovery never held formal council with the Pawnee, the nation hovers at the edges of the journals as…
The Blackfeet: Adversaries on the Marias
The Piegan Blackfeet appear briefly but consequentially in the Lewis and Clark journals — culminating in the only deadly violence of 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…
The Yankton Sioux: Calumet Bluff and the Long Shadow of Diplomacy
From the ceremonial council at Calumet Bluff in August 1804 to chance encounters with traders bound for their villages two years later,…
The Crow (Apsáalooke) in the Lewis & Clark Journals: A Distant but Decisive Presence
Though Lewis and Clark never held a council with the Apsáalooke, the Crow nation shadowed the expedition's path across the northern plains…
The Nez Perce (Chopunnish): Allies of the Bitterroot and Kooskooske
Saviors at Weippe Prairie, keepers of the expedition's horses, and gracious hosts during the long spring wait of 1806, the Nez Perce…
Sergeant Charles Floyd: The Only Casualty of the Corps of Discovery
Sergeant Charles Floyd, the youngest of the expedition's three sergeants, became the sole member of the Corps of Discovery to die during…
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…
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…
The Clatsop Nation: Hosts of the Corps’ Pacific Winter
For more than three months in the winter of 1805–1806, the Clatsop people of the lower Columbia were the nearest neighbors, traders,…
George Catlin in the Lewis & Clark Journal Record
George Catlin, the famed painter of Native American life, does not appear in the Lewis and Clark journals — but his later…
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.