Agde Round Lock

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Agde Round Lock
Agde bassin rond 3 portes.JPG
The round lock at Agde
Waterway Canal du Midi
Country France
Maintained by Voies navigables de France
Operation Hydraulic
First built c1676
Coordinates 43°19′13″N 3°28′03″E / 43.320253°N 3.467624°E / 43.320253; 3.467624Coordinates: 43°19′13″N 3°28′03″E / 43.320253°N 3.467624°E / 43.320253; 3.467624

The Agde Round Lock (French: L'Écluse Ronde d'Agde) is a canal lock on the Canal du Midi that connects to the Hérault River in Agde France. It is almost unique because it is round, which allows a boat to turn around, and the fact that it has three sets of lock gates, each with a different water level. It was built in 1676 of volcanic stone and was originally 29.20 m in diameter, 5.20 m deep.

The lock is no longer round. It was expanded during a program begun in 1978 to expand locks to the Freycinet gauge to allow for barges up to 38.50 metres long.[1]

Originally, buildings in the area of the lock included an administration building, stables, shops, and a chapel.[2][3]

The exits are to Béziers via the western section of the Canal du Midi, to Etang de Thau via the upper Hérault river and the eastern section of the Canal du Midi, and south to the Mediterranean via the lower Hérault river.[4]

A second French round lock can be found in the form of the, now disused, Ecluse des Lorraines, connecting the Canal latéral à la Loire with the River Allier.[5]


  1. ^ McKnight, Hugh (2005). Cruising French Waterways, 4th Edition. Sheridan House. pp. 261, 272. ISBN 978-0-7136-6638-0. 
  2. ^ Rolt, L. T. C. (1973). From Sea to Sea. Ohio University Press. ISBN 978-0-8214-0152-1. 
  3. ^ Mukerji, Chandra (2009). Impossible Engineering: Technology and Territoriality on the Canal du Midi. Princeton University Press. ISBN 978-0-691-14032-2. 
  4. ^ "Canal du Midi". Afloat in France. grehanman guides. Retrieved 2010-11-23. 
  5. ^ "Canal lateral a la Loire". Afloat in France. grehanman guides. Retrieved 2010-11-24.