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.
Boils, Bear-Fat, and the Rhythm of a Repair Day
On a rainy Monday near present-day Boonville, the Corps paused to mend rope and oars while six hunters crossed the river. Only Clark records the medical toll —…
At the Forks of an Unknown River: Four Voices Approach the Marias
On June 2, 1805, the Corps of Discovery encamped at a river junction that would soon become a navigational crisis. Four narrators record the day's hunt, weather, and…
Three Views of the Portage: Surveying, Suffering, and Assembling the Iron Boat
On a cloudy June day at the Great Falls Portage, Clark measures the route in agonizing detail, Gass begins assembling Lewis's iron boat frame, and Whitehouse synthesizes both…
Hunger’s Evidence: Pine Bark, Fish Traps, and Diplomatic Strain on the Kooskooskee
On May 8, 1806, three expedition journals converge on a single Nez Perce camp where evidence of winter starvation, an ingenious willow fish trap, and fraying chiefly relations…
A Violent Storm, a Missing Man, and the Mouth of the Soldier
Four narrators record the same August night on the Missouri, but only Clark turns the page toward crisis: a deserter, a lost Frenchman, and a decision to send…
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.
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…
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 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…
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…
George Catlin in the Lewis & Clark Journal Record
George Catlin, the famed painter of Native American life, does not appear in the Lewis and Clark journals — but his later…
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 Yankton Sioux: Calumet Bluff and the Long Shadow of Diplomacy
From the ceremonial council at Calumet Bluff in August 1804 to chance encounters with traders bound for their villages two years later,…
François Labiche: Hunter, Waterman, and Interpreter of the Corps of Discovery
A skilled hunter, reliable waterman, and multilingual interpreter, François Labiche appears throughout the journals as one of the expedition's most dependable enlisted…
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…
The Walla Walla Nation and Chief Yelleppit: Hosts of the Homeward Crossing
In late April 1806, the Walla Walla people and their principal chief Yelleppit provided the Corps of Discovery with horses, canoes, food,…
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…
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.