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.
Wagons, Skins, and a Cataract Measured at Personal Risk
While the main camp built truck wheels and dragged canoes up Portage Creek, Clark scaled cliffs to measure the Great Falls — nearly slipping to his death. Five…
Spoiled Elk, Wapato Roots, and a Whale on the Coast
On a windy December Sunday at Fort Clatsop, three narrators record the same Chinook trading visit in radically different registers — from Gass's terse fortification notes to Clark's…
Killed-Colt Creek and Snow for Water: Four Accounts of a Brutal Bitterroot Ascent
On a single punishing day along the Lolo Trail, four expedition journalists record the same climb in starkly different registers — from Clark's catalog of injured horses and…
Two Camps, Two Hungers: The Shoshone Feast and the Boatmen’s Slog
On a single August day, Lewis records one of the expedition's most visceral scenes — Shoshone hunters tearing into a fresh-killed deer — while Clark's water party, miles…
Five Canoes and a Camp of Sick Men: Divergent Views from the Clearwater
On the Clearwater River, Ordway, Gass, and Clark record the same day with strikingly different emphases — canoe-building labor, dietary illness, and the return of John Colter —…
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 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…
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 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…
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…
Karl Bodmer: A Note on Absence from the Lewis & Clark Journals
Despite his fame as a visual chronicler of the upper Missouri, the Swiss painter Karl Bodmer does not appear in the journals…
Jean Baptiste Charbonneau: The Infant Traveler of the Corps of Discovery
Born at Fort Mandan in February 1805, Sacagawea's son 'Pomp' became the youngest member of the Lewis and Clark Expedition, carried across…
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…
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 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…
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 Omaha (Maha) Nation: A Diminished People in the Journals of Lewis & Clark
Encountered as a once-powerful nation reduced by smallpox, the Omaha appear in the journals as absent hosts, grieving survivors, and distant adversaries…
Auguste Chouteau: St. Louis Patron of the Corps of Discovery
Co-founder of St. Louis and dean of its fur trade, Auguste Chouteau appears in the journals as host, supplier, and commercial presence…
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.