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.
Empty Game Bags and the Quiet Work of Coal Wood
On a fine winter Thursday at Fort Mandan, three expedition journalists record a day of fruitless hunting and steady fuel-cutting. Their brief, overlapping entries reveal both the rhythms…
The Blow at the Long Narrows: Four Accounts of a Singular Act
On a cold April morning above the Columbia falls, Meriwether Lewis struck an Indian man caught stealing—the only such act in the entire expedition. Four narrators record the…
Crossing the Kooskooske: Four Pens at the Founding of Long Camp
On 14 May 1806, the Corps swam its horses across the Kooskooske and settled into what would become Camp Chopunnish. Four narrators describe the same crossing — but…
Two Camps, Two Verdicts: The Day the Salmon River Closed the Door
On August 23, 1805, Clark scouted a canyon that proved impassable while Lewis sank canoes and watched Shoshone hunters run down a mule buck. The five narrators preserve…
Pursuing a Deserter: Four Journals on the Hunt for Moses Reed
On August 7, 1804, the Corps dispatched four men to retrieve the deserter Moses Reed — dead or alive. Gass, Whitehouse, Floyd, and Clark each record the order…
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.
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…
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…
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,…
Seaman: Lewis’s Newfoundland and the Fourth Member of the Corps
Purchased in Pittsburgh for $20, the Newfoundland dog Seaman became the only animal to complete the entire 8,000-mile journey to the Pacific…
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 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,…
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 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,…
The Chinook Nation: First Encounters at the Pacific
When the Corps of Discovery reached the mouth of the Columbia in November 1805, the Chinook were the first nation to greet…
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…
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…
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…
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.