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.
Three Forks of the Jefferson — A Note Left on a Pole
On August 4, 1805, Lewis scouted ahead and left a written note pinned to a pole directing Clark which fork to ascend. The narrators preserve a layered record…
Four Eyes on the Upper Missouri: Salt Crusts, Black Bears, and the Limits of Pumice
On a fair Sunday above the Yellowstone, Lewis, Clark, Ordway, and Gass each record the same twenty-four-mile run differently — revealing what the captains shared, what the sergeants…
Sacagawea’s Capture Site and a Captain Lost Among Beaver Dams
On July 30, 1805, the expedition passed the spot where Sacagawea was seized by the Hidatsa years earlier. While Clark battled rapids and Lewis became separated in a…
Ice on the River, a Bird in the Hand: Four Voices at Fort Clatsop
On the last day of January 1806, four expedition journalists record the same aborted hunt and the same dead bird — but the gulf between Gass's two sentences…
A Penknife at the Upper Camp: Boat-Building, Caching, and a Bleeding on the Portage
While Lewis improvises surgery with a penknife and Clark inventories the cache below, the enlisted journalists tally buffalo and baggage. The June 26 entries split neatly between two…
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 Sac and Fox Nation in the Lewis & Clark Record
Although the Sac (Sauk) and Fox (Meskwaki) nations occupied lands along the Mississippi and lower Missouri at the time of the Corps…
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…
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…
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 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…
George Shannon: The Youngest Soldier of the Corps of Discovery
From a starving boy lost on the prairie to a trusted hunter and trader on the return journey, George Shannon's three-year apprenticeship…
The Shoshone Nation: Sacagawea’s People and the Key to the Mountains
Across 126 journal entries, the Shoshone (Snake) people emerge as the indispensable hinge of the expedition — the nation whose horses, geography,…
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…
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,…
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…
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 —…
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…
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.