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.
Eight Equal Packs and a Distant Massacre: Provisioning Fort Mandan
On a cold March day at Fort Mandan, Clark distributes trade goods across eight canoe-loads while Ordway tracks the labor in clipped soldierly prose. Clark alone records Charbonneau's…
Retracing Steps to the Quamash Flats: Mortification and Unexpected Aid
On June 21, 1806, the expedition turned back from the snowbound Bitterroots toward the Weippe Prairie. Lewis and Clark recorded near-identical entries of frustration, while Ordway preserved practical…
Burning Bluffs and the Spirit Mound: Four Voices on a Single August Day
On August 24, 1804, four expedition journalists record the same stretch of river yet preserve strikingly different details — from smoldering clay bluffs and rabbit berries to a…
A Signal Gun, a Stiff Breeze, and Three Elk: Coordinating a Scattered Party
On the Missouri near the Soldier River, three narrators record the same day of waiting, hunting, and contrary winds. Their differing accounts reveal who commanded, who waited, and…
Crossing the Columbia for Horses: Four Pens at The Dalles
On April 16, 1806, the expedition split across the Columbia near The Dalles to bargain for horses. Four narrators—Lewis, Clark, Gass, and Ordway—record the day with strikingly different…
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 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,…
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 Nez Perce (Chopunnish): Allies of the Bitterroot and Kooskooske
Saviors at Weippe Prairie, keepers of the expedition's horses, and gracious hosts during the long spring wait of 1806, the Nez Perce…
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…
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…
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…
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 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…
The Iowa Tribe in the Lewis & Clark Journals: A Note on Absence
Although the Iowa (Ioway) Nation appears peripherally in the broader ethnographic horizon of the Lewis and Clark Expedition, the corpus of journal…
George Drouillard: Hunter, Interpreter, and Indispensable Man of the Corps
Across nearly three hundred journal entries, George Drouillard emerges as the expedition's most relied-upon hunter, sign-language interpreter, and scout — the man…
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…
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.