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.
Four Routes from Camp Disappointment: Divergent Journeys on a Single Day
On 26 July 1806 the expedition's narrators write from radically different positions on the landscape. Lewis departs Camp Disappointment toward a fateful encounter, Clark explores the Bighorn, while…
Trade, Bellows, and Badgers: Three Voices at Fort Mandan
On a frigid Sunday at Fort Mandan, three expedition journalists record the same day in strikingly different registers — Clark terse and thermometric, Ordway ethnographic, and Gass attentive…
Four Pens at the Mouth of the Cheyenne: Trade Intelligence and Compression on October 1, 1804
On a windy October day below the Cheyenne River, four expedition narrators recorded the same encounter with a French trader. Their entries reveal sharp differences in register, ethnographic…
Two Camps, Two Continents of Worry: Stolen Horses and Yellowstone Bottoms
On 15 July 1806 the divided Corps produced two strikingly different records: Lewis at the Great Falls anxious over missing horses and a grizzly-haunted portage, while Clark descended…
Charbonneau Reconsiders: Two Accounts of a Reluctant Interpreter’s Return
On a windy Sunday at Fort Mandan, Toussaint Charbonneau reverses course and rejoins the Corps of Discovery. Ordway and Clark each record the moment, but 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 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 Pawnee Nation: A Distant Presence in the Expedition’s Record
Though the Corps of Discovery never held formal council with the Pawnee, the nation hovers at the edges of the journals as…
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…
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…
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…
Silas Goodrich: The Expedition’s Fisherman
Private Silas Goodrich served as the Corps of Discovery's most dedicated angler, contracted syphilis at Fort Clatsop, and was among the small…
Ninian Edwards in the Lewis & Clark Journals: A Figure at the Margins of the Record
Though Ninian Edwards loomed large in the territorial politics of the trans-Mississippi West during and after the Corps of Discovery's expedition, the…
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 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,…
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…
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…
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…
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.