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.
The Cruzatte Incident: Three Accounts of Lewis’s Shooting
On the lower Missouri near present-day Williston, an elk hunt ended with Captain Lewis wounded by his own man. Gass and Ordway record the accident with revealing differences…
The Whale at Tillamook Head: Three Vantage Points on a Single January Day
On January 8, 1806, Clark scrambles across slippery headlands to barter for whale blubber while Lewis, confined to Fort Clatsop, turns ethnographer. Ordway's journal frames the expedition's domestic…
Empty-Handed Hunters and a Mandan Game on Frozen Ground
On a cold December Saturday at Fort Mandan, three narrators record the same day from sharply different vantages: Clark's terse hunting failure, Gass's brief summary, and Ordway's remarkable…
Three Views of the Valley: Entering the Plains Above the Gates
On a single July day in 1805, three expedition journalists record the same passage from rugged canyon into a fertile mountain valley — yet Lewis, Clark, and Gass…
Two Camps, Two Verdicts: The Day the Salmon River Closed the Door
On August 23, 1805, Clark scouted a canyon that proved impassable while Lewis sank canoes and watched Shoshone hunters run down a mule buck. The five narrators preserve…
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.
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 Mandan Nation: Heart of the Upper Missouri
From October 1804 through April 1805, the Mandan villages on the upper Missouri became the expedition's home, classroom, and trading partner —…
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 Otoe Nation: First Diplomatic Council on the Missouri
The Otoe (Oto) people were the first Native nation with whom Lewis and Clark held a formal diplomatic council, meeting at the…
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…
Sergeant Nathaniel Pryor: A Steady Hand of the Corps of Discovery
From squad leader at Camp Dubois to trusted lieutenant of small parties, Sergeant Nathaniel Pryor emerges from the journals as one of…
Jean Baptiste Charbonneau: The Infant Traveler of the Corps of Discovery
Born at Fort Mandan in February 1805, Sacagawea's son 'Pomp' became the youngest member of the Lewis and Clark Expedition, carried across…
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 Drouillard: Hunter, Interpreter, and Indispensable Man of the Corps
Across nearly three hundred journal entries, George Drouillard emerges as the expedition's most relied-upon hunter, sign-language interpreter, and scout — the man…
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 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…
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…
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.