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 Finished Canoe, an Empty Larder: Four Voices at Camp Chopunnish
On May 26, 1806, four expedition journalists record the same day at Camp Chopunnish — a launched canoe, a sick child, exhausted provisions — but the depth of…
Four Hands at Fort Mandan: Iron, Corn, Pleurisy, and the Sun
On a mild winter Saturday at Fort Mandan, four expedition journalists record the same day through strikingly different lenses — economic, medical, astronomical, and routine — revealing how…
Anchovies, Ailments, and the Catalogue of Coastal Birds
On a fair March day at Fort Clatsop, four narrators record the same departures and visitor — yet diverge sharply in scope. Gass and Ordway log logistics; Clark…
Four Pens, Four Worlds: Trade, Trail, and the Exhausted Wappato
On a quiet January day at Fort Clatsop, four expedition journalists produce strikingly different records — from Lewis and Clark's near-identical ethnographic essay on Chinookan trade to Gass's…
A Coal Bank, a Creek of Many Names, and a Missing Flanking Party
Five narrators record the same Missouri River day above Arrow Rock, but each preserves something different — a coal seam, wild apples, feeding deer, two wolves, an injured…
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.
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…
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 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…
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 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…
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…
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 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…
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…
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…
Toussaint Charbonneau: The Interpreter Who Brought Sacagawea
A French-Canadian fur trader hired at the Mandan villages, Charbonneau served as interpreter across the continent — though his greatest contribution to…
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…
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.