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 Place of Snakes and a Boat Nearly Lost
Five narrators record a near-disaster on a moving sand bar below Snake Creek, an encounter with returning French traders from the Pawnee, and Drouillard's tale of a turkey-gobbling…
Fog, Fatigue, and the Mosquito’s Hour: Four Voices on a Single August Day
On a foggy August morning along the lower Missouri, four expedition journalists record the same delayed start and difficult passage. Their parallel entries reveal striking differences in observational…
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…
Reckoning the Continent: Mileage, Manners, and the Chinook Encounter
On the south shore of the Columbia, Patrick Gass tallies a continent in miles while William Clark negotiates uneasy gift-exchange with the Chinook. Two narrators, two registers —…
Ice on the Missouri: Three Voices at the Threshold of Winter
On a cloudy November day at the future site of Fort Mandan, three expedition journalists record the same hours through markedly different lenses — from Clark's logistical command…
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.
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 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…
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 Hidatsa: Knife River Villagers and the Expedition’s Northern Crossroads
The Hidatsa — known to the French as the Gros Ventres or Big Bellies, and to themselves and the captains by various…
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…
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…
Toussaint Charbonneau: The Interpreter Who Brought Sacagawea
A French-Canadian fur trader hired at the Mandan villages, Charbonneau served as interpreter across the continent — though his greatest contribution to…
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…
John Shields: The Expedition’s Indispensable Artisan
Blacksmith, gunsmith, and woodworker John Shields proved one of the most practically valuable men of the Corps of Discovery — repairing arms,…
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…
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…
Karl Bodmer: A Note on Absence from the Lewis & Clark Journals
Despite his fame as a visual chronicler of the upper Missouri, the Swiss painter Karl Bodmer does not appear in the journals…
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.