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.
Two Rivers, Two Crises: The Split Expedition on July 12, 1806
On a single day in July 1806, the divided Corps faced parallel emergencies — Lewis hunting stolen horses on the Missouri, Clark wrestling wind-driven canoes on the Jefferson.…
A Broken Voyage, a White Bear Skin, and a Missing Sergeant: Four Voices at Camp Chopunnish
On June 1, 1806, four expedition narrators record a single day at Camp Chopunnish from strikingly different vantages — from Lewis's botanical precision to Ordway's distant trail diary,…
Two Pens at Fort Mandan: Trade Diplomacy and a Stolen-Horse Skirmish
On a cloudy March day at Fort Mandan, Sergeant Ordway notes only weather and provisions while Captain Clark records chiefly visits, a North West Company request, and an…
Sacagawea’s Capture Site and a Captain Lost Among Beaver Dams
On July 30, 1805, the expedition passed the spot where Sacagawea was seized by the Hidatsa years earlier. While Clark battled rapids and Lewis became separated in a…
Four Pens at the Wah-how-pum Village: A Lost Horse and a Circle Dance
On April 23, 1806, four expedition journalists record the same day from strikingly different angles — Charbonneau's missing horses, a trade for dogs and shappalell, and a Wah-how-pum…
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 Osage Nation in the Lewis & Clark Journals: A Synthesis
Though no journal entries in our tagged corpus directly reference the Osage Nation, their shadow falls across the early expedition record through…
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…
The Shoshone Nation: Sacagawea’s People and the Key to the Mountains
Across 126 journal entries, the Shoshone (Snake) people emerge as the indispensable hinge of the expedition — the nation whose horses, geography,…
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…
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 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…
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…
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,…
The Crow (Apsáalooke) in the Lewis & Clark Journals: A Distant but Decisive Presence
Though Lewis and Clark never held a council with the Apsáalooke, the Crow nation shadowed the expedition's path across the northern plains…
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…
Seaman: Lewis’s Newfoundland and the Fourth Member of the Corps
Purchased in Pittsburgh for $20, the Newfoundland dog Seaman became the only animal to complete the entire 8,000-mile journey to the Pacific…
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.