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.
A Broken Mast and a Country Skipping with Deer
Ten miles above the Kansas, the party logs the Little Platte, breaks its mast, and walks through a landscape so thick with deer that Clark compares their tracks…
Two Captains, Two Rivers: Converging Reports at the Marias Decision Camp
On June 6, 1805, Lewis struggled with rafts on the northern fork while Clark returned from the south. Four narrators record the same day in radically different registers,…
A Stopped Chronometer and a Walk Through Plum and Cherry Country
While Lewis wrestles with a malfunctioning chronometer that threatens the expedition's celestial fix, Clark and Ordway walk inland through prairie streams thick with ripe fruit. Six narrators preserve…
A Captain Alone, A Crew Lamed: Convergence on the Jefferson
On the last day of July 1805, four expedition narrators describe the same anxious reunion on the Jefferson River. Their overlapping accounts reveal what each man chose to…
Hailstones, Crimson Water, and a Bear at Twenty Yards
On June 27, 1805, the Corps remained at the Great Falls portage as a violent hailstorm stained the Missouri red. Lewis records a bear hunt from a treetop;…
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.
Hugh McNeal: A Private’s Long March
Private Hugh McNeal of the Corps of Discovery served as Lewis's companion at the Shoshone encounter, suffered illness at Fort Clatsop, and…
The Lemhi Shoshone: Horse Lords of the Continental Divide
The Lemhi Shoshone — Sacagawea's people — held the keys to crossing the Rocky Mountains. Their horses, geographic knowledge, and a single…
Charles Marion Russell: The Cowboy Artist and the Lewis & Clark Imagination
Charles Marion Russell (1864–1926) does not appear in the Lewis and Clark journals — he was born nearly six decades after 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…
The Otoe-Missouria: First Council on the Plains
The Otoe and Missouria nations gave Lewis and Clark their first formal diplomatic council with Native peoples — a meeting at Council…
The Flathead Salish: Allies in the Bitterroot
From the friendly council at Ross's Hole to the river that bore their name, the Flathead Salish (Tushepaws) provided the Corps 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…
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,…
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 —…
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…
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…
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…
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.