Carte particulière d’une partie de la Louisianne … les routtes par terre relevé & mesurées aux pas (Broutin, de Vergés and Saucier, 1743)

A French manuscript map signed at New Orleans on 10 November 1743 by Demarigny, drawn from the surveys of the engineers Ignace-François Broutin and de Vergés and the draughtsman Saucier: the Mississippi from the Balize to Fort de l’Assomption (Memphis), with the Red River, the Yazoo, the Pascagoula, the Mobile and the Tombigbee up to the Chickasaw country, and the overland routes they measured by pace in the years of the French Chickasaw campaigns of 1736–40, drawn as red dotted lines. A key, “Renvoye des routtes par terre”, names each route by its lettered points: from Fort St. Martin (A) on the Mississippi over the heights (B) to the Yazoo; from Fort de l’Assomption to the first branch of the Yazoo (E) and on to the Chickasaw; up the Margot (F–K); from the Petit portage on the Tombigbee (M) to the Chickasaw; and Saucier’s routes from the Chickasaw to the Choctaw, from the Yazoo (L) to the Choctaw towns and Fort Tombecbé, and from that post to the Chickasaw. A Nota describes the ground of each — open oak ridges and prairie, canebrakes, ravines and drowned bottoms. It draws the Villages Tchkachas (Chickasaw), the Choctaw towns inside a dotted “circuit des villages Tchactas au nombre de 44 villages”, the “passage des anglois” — the English traders’ way — from the Choctaw towns to Tombecbé, the Alabama towns at Fort Toulouse, and the villages and old village sites of the Arkansas, Tunica, Avoyel, Chakchiuma, Ibitoupa, Biloxi, Mobile and Tawasa. The title, key and Nota are not shown.

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MapCarte particulière d'une partie de la Louisianne ou les fleuve et rivierres [i.e. rivières] onts etés relevé a l'estime & les routtes [i.e. routes] par terre relevé & mesurées aux pas, par les Srs. Broutin, de Vergés, ingénieurs & Saucier dessinateur
AuthorBroutin, de Vergés and Saucier, 1743
ArchiveLibrary of Congress
RightsPublic domain. An unpublished French colonial manuscript map, signed at New Orleans in 1743 — more than 270 years old, so public domain. Evidence
AccuracyAbout 29 km (RMS 5.3 km at 33 control points). Placed by hand in a map-queue session and approved by a person. If something sits in the wrong place, members can fix it with Fix placement on the map.
MethodPlaced by hand: a smoothing thin-plate spline through 33 places read from the scan — forts, river mouths, lake ends, passes, islands and the Chickasaw towns — and matched to their positions today. The coast from Lake Pontchartrain to Pensacola is drawn closely (half its places within 6 km of where the rest put them), and so is the Mississippi below Natchez; the interior rivers were estimated and the overland routes paced, so the posts up the Tombigbee (Tombecbé, the Black Warrior mouth) and at Memphis (Fort de l’Assomption, the St. Francis mouth) come 17–21 km out, and Natchitoches, at the western edge, 30 km. The leave-one-out median is 6.6 km. The map has a latitude scale on its borders but no meridians (the catalogue’s Paris prime meridian is not drawn); its latitudes run 0.1–0.25° north of the places, so the places were used. See the methodology.
Version1.0.0, updated 2026-10-16
CoversMississippi, Alabama, Louisiana, Tennessee, Arkansas, Florida

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Changelog

  • 1.0.0 (2026-10-16): First release: placed by hand at 33 places. From the Library of Congress, Geography and Map Division (2003623370); added for Project Homeland.

Credits

  • From the Library of Congress, Geography and Map Division (2003623370); added for Project Homeland
  • Georeferencing: Native Routes
  • Scan: Library of Congress

Control points

The full list of control points with residuals is in control-points.geojson. Historic names indexed for search: names.geojson.

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