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 Slipped Bluff, a Starving Dog: Three Pens on the Bald-Pate Prairie
On July 18, 1804, the expedition glided past Bald-Pate Island under a southeast breeze. Gass, Ordway, and Clark each recorded the day's slipped bluff, iron ore, and a…
The Other Side of the Falls — June 13, 1805
Lewis discovered the Great Falls — but the boat party 18 miles behind him wrote a quiet day of upstream labor, naming a new creek, picking yellow currants.…
Two Camps, One Day: Boat-Building, Bears, and a Crimson Creek
On June 28, 1805, the Corps of Discovery worked at two separated camps along the Great Falls portage. Lewis, Clark, Gass, and Whitehouse each leave fragments of the…
Pickets and Pumpkins: A Day of Trade at Fort Mandan
On a clear December Sunday at Fort Mandan, four expedition journalists record the same day with strikingly different emphases — from terse construction notes to Clark's vivid account…
A Fort in Motion: Industry, Diplomacy, and a Rival Company’s Gift
On a cloudy March day at Fort Mandan, Ordway and Clark capture a captain juggling cartography, medicine, and intelligence-gathering — while a North West Company gift to the…
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 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…
Old Toby: The Shoshone Guide Through the Bitterroots
Old Toby, the Shoshone guide hired by Lewis and Clark, led the Corps of Discovery across the most treacherous leg of their…
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 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…
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 Sioux Nation in the Lewis & Clark Journals: A Note on Absent Sources
Although the Sioux figure prominently in the documented history of the Lewis and Clark Expedition, the source set provided for this synthesis…
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…
York: The Enslaved Man Who Crossed a Continent
Enslaved by William Clark from boyhood, York walked, paddled, hunted, voted, and traded across 8,000 miles with the Corps of Discovery —…
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…
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…
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,…
John Shields: The Expedition’s Indispensable Artisan
Blacksmith, gunsmith, and woodworker John Shields proved one of the most practically valuable men of the Corps of Discovery — repairing arms,…
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.