Route nationale française 520c

Route nationale 520C
Panneau Michelin marquant l'origine de la RN520C à Entre-Deux-Guiers.© G.E.
Localisation
Pays	France
Région	Auvergne-Rhône-Alpes
Caractéristiques de 1933 à 1973
Itinéraire	Entre-Deux-Guiers - Saint-Pierre-d'Entremont
Longueur	11,6 km

Présentation

• La route nationale 520^C, ou RN520^C, est une ancienne route nationale française, antenne de la RN520, qui reliait Entre-Deux-Guiers (RN520) à Saint-Pierre-d'Entremont (RN512) par les Gorges du Guiers Vif.

Historique

• A sa création, en 1933, elle est définie comme l'annexe des Échelles à Saint-Pierre-d'Entremont.
• Elle est issue du chemin de grande communication n° 102 de l'Isère, ou Gc102 (38).
• Elle est déclassée en 1973 en D520^C.

Rôle

• La D520^C est un itinéraire secondaire donnant accès aux petites communes de Saint-Christophe et Saint-Pierre-d'Entremont.
• Elle permet d'accéder à la station de ski de la Ruchère. A partir de Saint-Pierre-d'Entremont, il est possible d'atteindre le cirque de Saint-Même, où le Guiers Vif prend sa source, aux cols du Cucheron et du Granier, et aux stations de ski de Saint-Philibert et des Déserts-d'Entremont.

Description

Panneau en tôle à l'origine de la RN520^Cà Entre-Deux-Guiers. © G.E.

La D520^C (ex-RN520^C) au niveau du Pas du Frou. © Dominique Robert

• L'ex-RN520^C prend naissance dans la commune d'Entre-Deux-Guiers, sur l'ex-RN520, dans un carrefour étriqué. Après un passage étroit, elle quitte l'agglomération et franchit la déviation de l'ex-RN520, que l'on peut rejoindre par deux bretelles. En face se dressent les impressionnantes falaises calcaires de la Ruchère, tandis que l'extrémité méridionale du massif de l’Épine est visible à gauche. La route ne tarde pas à atteindre Saint-Christophe-sur-Guiers.
• Passé ce village, le tracé se fait plus sévère et s'établit en corniche le long d'un premier chaînon montagneux. Un virage à gauche en lacet précède le plateau où est établi le hameau de Berland. Puis l'ascension reprend et la route s'engouffre dans les gorges du Guiers Vif, marquant la limite entre l'Isère et la Savoie. La route y est établie en hauteur, du côté isérois.
• Le Pas du Frou constitue l'un des endroits les plus pittoresques. La route a été taillée dans la falaise, et sur la gauche, un haut mur de soutènement est établi. Le site est suivi d'un court tunnel précédant la bifurcation de la petite route pentue menant à la Ruchère.
• La route suit son cheminement le long des gorges sur un profil assagi, traversant quelques petits hameaux. Peu avant Saint-Pierre-d'Entremont, un tunnel foré au début des années 1990 permet d'éviter le défilé du Petit Frou, un passage à flanc de falaise qui était sujet aux éboulements. A Saint-Pierre-d'Entremont, village constitué de deux communes, l'une établie en Isère sur la rive gauche du Guiers Vif, l'autre en Savoie sur la rive droite, on rejoint l'ex-RN512.

Tracé historique

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Tracé de 1933 à 1973.
En jaune	Tunnel du Petit Frou, mis en service en 1990.
En gris	Ancien tracé dans le défilé du Petit Frou, interdit à la circulation depuis 1990.
Pour plus d'informations sur les sources cartographiques, consulter cet article.
La carte ne s'affiche pas ? Merci d'éditer l'article et de le sauvegarder sans aucune modification.

• Isère (38) - D520^C
  • D520 Entre-Deux-Guiers
  • Saint-Christophe-sur-Guiers
    • Les Millioz
    • D520
    • Le Béretier
    • Saint-Christophe Village
    •   Lacets
    • Berland
    • Le Combet
    • Le Châtelard
    •  
    •  Tunnel du Pas du Frou (75 m)
    •  Pas du Frou (465 m)
    • Gorges du Guiers Vif
    • Le Planey
    • Les Sermes
  • Saint-Pierre-d'Entremont
    • Château du Gouvernement
    •  Tunnel du Petit Frou (215 m)
    • Saint-Pierre-d'Entremont D512