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.
Caching at the Confluence: Five Accounts of a Day Spent Lightening the Load
At the Marias River decision camp, the captains prepared to leave the red pirogue and a thousand pounds of stores behind. Five narrators record the same logistical day,…
Loisel’s Cedar Fort and the Architecture of Memory
On a foggy September morning above the Big Bend, four expedition journalists encountered Régis Loisel's abandoned cedar trading post. Their overlapping descriptions reveal striking patterns of textual borrowing—and…
A Belt of Blue Beads for a Sea-Otter Robe
On a wind-bound day at the mouth of the Columbia, three expedition narrators record the same trade — a sea-otter robe purchased with Sacagawea's beaded belt — but…
Recovery and Routine at Canoe Camp
On a cool October morning along the Clearwater, three expedition narrators record the same day with strikingly different priorities — Clark tracks the men's health, Ordway counts elk,…
Spoiled Elk, Wapato Roots, and a Whale on the Coast
On a windy December Sunday at Fort Clatsop, three narrators record the same Chinook trading visit in radically different registers — from Gass's terse fortification notes to Clark's…
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.
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…
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…
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 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 —…
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…
Silas Goodrich: The Expedition’s Fisherman
Private Silas Goodrich served as the Corps of Discovery's most dedicated angler, contracted syphilis at Fort Clatsop, and was among the small…
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 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 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…
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…
The Arikara Nation: Diplomatic Crossroads on the Upper Missouri
Across forty-two journal entries, the Arikara emerge as central players in the expedition's diplomatic strategy — corn-growing villagers caught between Sioux pressure…
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…
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.