This opening is one of the Rochefort entrances. This north-south road coincides with the salt route: salt arrives from La Vilaine Maritime (La Roche-Bernard and Guérande) and transported inland (throughout Brittany). Therefore, Rue Candré is the main road and called “Grande Rue” (Main Street).
Go though the Porte de l’Étang and admire the washhouse on your left.