Timeline

Heritage classified

Key figures

Origin and history

The locks of Saint-Roch form a scale of four single chamber locks on the Canal du Midi, built around 1678 at 65.4 km from Toulouse, 170 m above sea level. They allow to cross a elevation extending the port of Castelnaudary, between the Gay Lock (east) and the Planque Lock (west). Each oval room, made of cut stone masonry, is located below the previous one, with steps for pedestrians. A rectangular lock house, covering a leak canal feeding two mills (1680), dominates the site. These mills, located back on the right bank, complete the hydraulic development.

The Canal du Midi, designed by engineer Pierre-Paul Riquet under Louis XIV, links the Atlantic to the Mediterranean. Work began in 1667 between Toulouse and Naurouse, and the section until Castelnaudary was completed in 1674. The Saint-Roch locks, built in the last quarter of the 17th century (circa 1678), meet the need for airworthiness after launching this section. The buildings, although remodeled in the 19th century, retain the foundations of the Old Regime. The site, including the Captainrie Art Déco near the haulage road, is listed as historical monuments by order of 19 September 1996.

The ensemble illustrates 17th century hydraulic engineering, combining functionality (navigation, mills) and utility architecture. The lockhouse, later enlarged, and the mills testify to the adaptation of the infrastructure to local needs. The sober style of the mastery (XX century) contrasts with the classical aesthetics of the locks, reflecting the technical and architectural evolutions of the canal over the centuries.

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