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, Two Errands: The Whale Road and the Beaver Bait
While Clark scaled a precipitous coastal mountain to reach a stranded whale already stripped by the Tillamook, Lewis stayed at Fort Clatsop composing a meticulous recipe for beaver…
Two Captains, Two Continents: The Divided Corps on Divergent Trails
On July 6, 1806, the split expedition pursued separate routes across the Continental Divide. The four journals reveal not only different landscapes but distinct authorial habits — from…
Three Voices at the Big Bend: Hunting, Geography, and a Captain’s Relapse
On August 27, 1806, three expedition narrators record the same descent through the Great Bend of the Missouri. Their accounts diverge sharply in detail, register, and silence—revealing what…
Clearing Ice from the Perogues: Two Voices on a Fort Mandan Workday
On 22 February 1805, Patrick Gass and John Ordway both record the labor of freeing the expedition's boats from winter ice at Fort Mandan. Their brief entries reveal…
Ice, Water, and Wandering Entries: A Fort Mandan Day in Disarray
On 22 January 1805, the expedition's narrators diverge sharply. Clark and Ordway record a frustrating attempt to free the iced-in boats at Fort Mandan, while Gass and Whitehouse…
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 Shawnee Nation in the Lewis & Clark Record
Though the Corps of Discovery did not encounter the Shawnee homeland during their westward journey, the Shawnee people occupied a notable place…
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 Omaha (Maha) Nation: A Diminished People in the Journals of Lewis & Clark
Encountered as a once-powerful nation reduced by smallpox, the Omaha appear in the journals as absent hosts, grieving survivors, and distant adversaries…
Auguste Chouteau: St. Louis Patron of the Corps of Discovery
Co-founder of St. Louis and dean of its fur trade, Auguste Chouteau appears in the journals as host, supplier, and commercial presence…
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…
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 Walla Walla Nation and Chief Yelleppit: Hosts of the Homeward Crossing
In late April 1806, the Walla Walla people and their principal chief Yelleppit provided the Corps of Discovery with horses, canoes, food,…
The Otoe-Missouria: First Council on the Plains
The Otoe and Missouria nations gave Lewis and Clark their first formal diplomatic council with Native peoples — a meeting at Council…
François Labiche: Hunter, Waterman, and Interpreter of the Corps of Discovery
A skilled hunter, reliable waterman, and multilingual interpreter, François Labiche appears throughout the journals as one of the expedition's most dependable enlisted…
William Bratton: Hunter, Saltmaker, and Patient of the Corps of Discovery
A Virginia-born private whose journey through the journals traces a path from messmate and marksman to gravely ill convalescent — and finally,…
The Sioux Nation in the Lewis & Clark Journals: A Note on Absent Sources
Although the Sioux figure prominently in the documented history of the Lewis and Clark Expedition, the source set provided for this synthesis…
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 —…
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.