Route départementale française D3 (01)

Route départementale D3 (01)
Signalisation sur la D3 à Saint-Etienne-du-Bois. © Google Street View
Localisation
Pays	France
Département	Ain (01)
Caractéristiques actuelles
Itinéraire	Saint-Etienne-du-Bois (Gare) - Marsonnas (39)
Longueur	25 km

Présentation

• La route départementale D3 (01), ou RD3 (01), est une route départementale de l'Ain (01) qui va de la Gare de Saint-Etienne-du-Bois, à Marsonnas, dans le Jura.

Historique

• La première route à avoir porté ce numéro, en 1813, est la route de Bourg à Lyon par Neuville, Châtillon, Ste Euphémie et Trévoux . Démantelée, elle deviendra en partie la N436 en 1933.
• La D3 actuelle est issue du Gc3 de la gare de St-Etienne-du-Bois à la Croix-Luc. Le Dictionnaire Topographique et Historique de Pommerol (1907), cité par les Archives Départementales de l'Ain, nous apprend que de la gare de St-Etienne-du-Bois, part le chemin de G. C. n° 3, allant à la Croix Luc par Treffort et Chavannes-sur-Suran.
• Cette route est très ancienne puisqu'elle apparaît déjà sur la carte de Cassini au XVIII^e siècle puis sur les minutes d'Etat-Major du XIX^e (tracées entre 1825 et 1866) sous le nom route de Bourg à Nantua. Cet itinéraire sera ensuite remplacé par la D6 qui est devenue D936.
• La D3 comporte deux annexes :
  • la D3^A va de Chauvuissiat à Marcia (Jura).
  • la D3^B dessert Cuisiat.

Anecdotes

• La Croix-Luc est un lieu-dit qui n'apparaît plus sur les cartes actuelles.
• La route ne change pas de numéro en entrant dans le Jura sur la plupart des cartes, bien que la D3 de ce département ne soit absolument pas localisée à cet endroit. Il s'agit en réalité d'une route communale dans ce département, la C8.
• Sur certaines cartes, Marsonnas est orthographié "Marsonna".

Tracé

Chargement de la carte...

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• Ain (01) - D3
  • Saint-Etienne-du-Bois Gare
  • Saint-Etienne-du-Bois D1083
  • Treffort-Cuisiat (Treffort)
  •  Court tronc commun avec la D936, via Dhuys.
  • Chavannes-sur-Suran D42
  •  Collet de Chavannes (520 m)
  • Arnans
• Jura (39) - C8
  • Marsonnas