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.
Airing Goods at Fort Mandan: A Day of Preparation Under Indian Eyes
As the Corps of Discovery readied itself to push west from Fort Mandan, Clark and Ordway record the same mundane chores — airing trade goods and shelling corn…
Two Scales of Witness on the Columbia Shore
On a rainy November day near the Pacific, Clark ranges miles up a sand beach measuring a condor's wingspan while Gass, in camp, records a Chinookan visitor's cedar-and-bear-grass…
Discipline and the Nadawa: Mess Orders Beside the Largest Island
On a Sunday camp at the head of Nadawa Island, Lewis issues formal provisioning orders while Clark counts the sick, Ordway corrects spellings, and Whitehouse hunts a phantom…
Burying the Iron Boat, Felling Hollow Cottonwoods
On a windy July day at the Great Falls portage, the expedition splits in two: Lewis interring his failed iron-frame boat while Clark hunts upriver for cottonwoods sound…
First Rain Since October: Launching the Craft at Fort Mandan
On the eve of departure from Fort Mandan, three narrators record the same launching of boats into the Missouri — yet only Clark grasps the meteorological significance 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.
John Colter: The Hunter Who Walked Away From Home
From Pryor's mess at Camp Dubois to a solitary parting on the upper Missouri, John Colter emerges in the journals as one…
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…
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,…
Old Toby: The Shoshone Guide Through the Bitterroots
Old Toby, the Shoshone guide hired by Lewis and Clark, led the Corps of Discovery across the most treacherous leg of their…
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…
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 Teton Sioux (Lakota): Gatekeepers of the Upper Missouri
At the mouth of the Bad River in late September 1804, the Corps of Discovery faced its most dangerous standoff. The Teton…
Hugh McNeal: A Private’s Long March
Private Hugh McNeal of the Corps of Discovery served as Lewis's companion at the Shoshone encounter, suffered illness at Fort Clatsop, and…
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…
Ninian Edwards in the Lewis & Clark Journals: A Figure at the Margins of the Record
Though Ninian Edwards loomed large in the territorial politics of the trans-Mississippi West during and after the Corps of Discovery's expedition, the…
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.