The eighth of October 1804 brought the Corps of Discovery to the lower Arikara villages near a long island in the Missouri, in present-day Walworth County, South Dakota. Four narrators — Captain William Clark, Sergeants Patrick Gass and John Ordway, and Private Joseph Whitehouse — record the day’s progress, but their accounts diverge in revealing ways. The differences expose a hierarchy of information: Clark commands geographic and diplomatic detail, Ordway absorbs much of it secondhand, Gass condenses, and Whitehouse pares the day to its bare bones.
Naming the Rivers: A Tangle of Authority
The day’s most telling discrepancy concerns two streams entering from the south. Clark, drawing directly on Arikara informants, distinguishes them carefully. The larger river, 120 yards wide, he calls by its Arikara name:
Passed the Mouth of a River on the L. S. called by the Ricaries We-tar-hoo. this river is 120 yards wide, the water Confined within 20 yards, throws out mud with little Sand
Two miles above, Clark notes a second, smaller stream of 25 yards, “Called Maropa 25 yards wide Chocked up with mud.” In his fuller draft he glosses it as “Beaver Dam R.”
Ordway, by contrast, collapses the two waterways. He applies the name Marappa to the larger river at which the party halted for dinner:
took dinner at the Mouth of a River which came in on s. s. a large Timberd Bottom at the Mouth of this River we named this River Marappa.
Only later does he mention “another creek on s. s.” — the smaller stream that Clark identifies as the true Maropa. Gass replicates Ordway’s confusion almost exactly, calling the dinner-stop river “the Marapa” at 120 yards wide and noting an unnamed creek of “25 yards wide” four miles further on. The pattern suggests that Gass and Ordway shared notes or a common informant in the ranks, while Clark worked from the captains’ direct consultation with Arikara and French speakers. Whitehouse, writing most briefly, follows the sergeants: “we passed the mouth of Marroppy [Maropa] River.” The name that stuck in the enlisted men’s journals was the wrong one.
The Village and the Diplomatic Encounter
All four narrators agree that the party encamped above an island holding the lower Arikara village, but they record the encounter at vastly different resolutions. Whitehouse offers only the skeleton: “we came to the upper end of an Island where one band of the Rick-a-rees live. we camped above the Is‘.” Gass adds a comparable single sentence.
Ordway, however, preserves details the other enlisted men omit — the assembled spectators, the French resident taken aboard, and Lewis’s evening visit:
a nomber of the Indians assembled on the Sand bar opposite the village to See us. A frenchman with them, we took the frenchman on board he Informed us that they were all friendly & Glad to See us.
Clark identifies this Frenchman as Joseph Gravelines, who would become the expedition’s principal Arikara interpreter: “Mr. Gravotine a French man joined us as an interpeter.” Ordway knows the man’s role but not yet his name; Gass and Whitehouse do not mention him at all. Clark alone records the precaution that closed the day — “a Sentinal on board of the boat at anchor, a pleasent evening all things arranged both for Peace or War” — a phrase that captures the captains’ diplomatic posture in a way no subordinate journal attempts.
Registers of Observation
The four entries together form a graded scale of detail. Clark supplies latitude (“45° 39′ 5″ N”), the dimensions of the island (“about 3 miles long”), the crops cultivated (“Corn Tobacco Beens &c.”), and the Arikara toponym for the larger river. Ordway preserves the day’s incidental texture: a wounded elk, a flock of “goats” (pronghorn), Lewis taking the meridian altitude, the tobacco carried into the village. Gass produces a competent itinerary stripped of diplomacy. Whitehouse reduces the day to four sentences.
The pattern is consistent with what readers find elsewhere in the journals: Clark as the geographic and ethnographic authority, Ordway as the most reliable enlisted chronicler, Gass as a condenser working at one remove, and Whitehouse as a diarist content with the barest itinerary. The shared error over the Maropa’s name is particularly instructive — it shows how misinformation traveled horizontally among the sergeants and privates while Clark, working from Arikara informants and Gravelines, produced the version that would survive on later maps as Grand River.
