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.
Diplomacy, Roots, and a Yankee Phrase: Four Voices at Camp Chopunnish
On June 6, 1806, four expedition journalists record the same day at Camp Chopunnish with strikingly different scope. Clark conducts diplomacy with the Broken Arm; Lewis describes a…
Scarlet Cloth and Big Medicine: Four Voices on a May Snowstorm
On a paradoxical May day of green leaves dusted with snow, the expedition's four journalists record the same hunt, the same sacrifice-cloth, and the same unfamiliar phrase—'big medicine'—in…
Four Pens at Fort Mandan: Traders, Hunters, and a Mystery Animal
On a mild January day at Fort Mandan, four expedition journalists record the same visit by North West Company traders—but each narrator preserves a different fragment of the…
First Whiskey Since July 1805: An Encounter with Chouteau’s Trading Boat
On a Missouri River sandbar, the Corps meets a St. Louis trading vessel bound for the Yanktons. Three narrators record the same encounter — but only Clark names…
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…
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 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…
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…
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…
The Tillamook (Killamuck): Coastal Neighbors of Fort Clatsop
Living south of the Columbia's mouth, the Tillamook ("Killamucks" in the journals) traded whale blubber, oil, and roots with the Corps during…
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 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…
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…
Thomas Jefferson: The Distant Architect of the Voyage of Discovery
Though never present on the trail, President Thomas Jefferson shaped every mile of the Corps of Discovery's journey. He appears in the…
The Yakama Nation in the Lewis & Clark Journals: A Brief Encounter at the Great Confluence
The Yakama people appear in the expedition record at a single pivotal moment — the Corps of Discovery's October 1805 arrival at…
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…
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…
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…
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.