Bief de la Folie

The Bief de la Folie is a section of the Orléans Canal situated between the Sainte-Catherine lock upstream and the Folie lock downstream. It forms part of the first stretch of the canal constructed by Robert Mahieu between 1676 and 1678, linking Vieilles-Maisons-sur-Joudry to Buges. Measuring 2,060 metres in length, the reach lies entirely within the municipality of Châlette-sur-Loing. The reaches known as La Folie and Buges are located in Châlette-sur-Loing but take their names from districts of the neighboring municipality of Corquilleroy.

History

An initial section of the Orléans Canal was excavated by Robert Mahieu between Vieilles-Maisons-sur-Joudry and Buges from 1676 to 1678 and opened to the transport of timber and coal. The Bief de la Folie and the Folie lock were constructed during this first phase. Extension of the canal to the Loire was carried out between 1681 and 1687, and the waterway was inaugurated in 1692.[1]

From 1692 to 1793, the canal experienced significant growth, with an estimated 1,500 to 2,000 vessels navigating upstream each year from Nantes on the Loire toward Paris.[2] In 1793, the canal became national property.[3] Between 1807 and 1860, it was operated by the Compagnie des canaux d’Orléans et du Loing,[4] and in 1863 its management was transferred to the Ponts et Chaussées for a period of 91 years.[5]

Between 1908 and 1921, despite a marked decline in inland waterway freight traffic, works were carried out to extend the Orléans Canal between Combleux and Orléans.[6] Following the complete cessation of navigation, the canal was declassified as a navigable waterway in 1954 and incorporated into the private domain of the State.[7]

In 1978, the Joint Management Syndicate of the Orléans Canal was established to manage, promote, and organize activities across the canal estate.[8] In 1984, management of the estate was entrusted to the Loiret department for a period of 50 years, with the Syndicate retaining responsibility for day-to-day operations, while ownership remained with the State.[9]

Description

Characteristics

The Bief de la Folie is a 2,060-metre section of the Orléans Canal located between the Sainte-Catherine lock upstream and the Folie lock downstream,[10] entirely within the municipality of Châlette-sur-Loing.

It includes two turning basins designed to facilitate the manoeuvring of pleasure craft. These consist of widened sections of the canal and are situated at the confluence with the Bezonde and upstream of the Folie lock.[11]

Canal rehabilitation works

As part of the canal restoration project, dredging of the reach bed and works to protect the canal banks are planned.[12]

Dredging

Reopening the canal to navigation requires compliance with specific dimensional standards, including a minimum water depth of 1.40 m—corresponding to a vessel draft of 1.20 m with an under-keel clearance of 0.20 m—and a minimum surface width of 8 m.[13] Meeting these requirements entails dredging the canal bed to restore sufficient navigable depth. For the Bief de la Folie, the dredging volume is estimated at approximately 2,302 m³ of silt over a dredgeable length of 2,030 m, representing an average of about 1.1 m³ per linear meter.[14]

Bank protection

As part of the canal rehabilitation project, approximately 250 m of natural banks are to be protected. The estimated cost of these works was €25,000 (excluding tax) in 2009.[15]

Folie lock

The Folie lock has a chamber length of 31.4 m and a width of 5.2 m. The NGF elevations of the main elements of the lock are as follows: upstream reach: 82.63, downstream reach: 81.78, top of the lock wall: 84.08. The drop height is therefore 0.85 m.[16]

The Folie lock is operational, therefore not requiring any work as part of the project to reopen the Orléans Canal to navigation.[16]

See also

References

  1. ^ Rabartin 1993, p. 13
  2. ^ Rabartin 1993, pp. 23–28
  3. ^ Rabartin 1993, p. 28
  4. ^ Rabartin 1993, p. 29
  5. ^ Rabartin 1993, p. 31
  6. ^ Rabartin 1993, p. 34
  7. ^ Rabartin 1993, p. 37
  8. ^ Rabartin 1993, p. 38
  9. ^ Rabartin 1993, p. 39
  10. ^ Rabartin 1993, p. 69
  11. ^ Mauret-Cribellier 2008, p. 50
  12. ^ "La renaissance du canal d'Orléans : le Loiret au fil de l'eau" [The rebirth of the Orleans Canal: the Loiret along the water]. Loiret (in French). 15 September 2025. Retrieved January 6, 2026.
  13. ^ AIRELE Design Office (2009). Dossier de déclaration au titre de la loi sur l'eau [Water Act declaration file] (in French). Conseil général du Loiret. p. 7.
  14. ^ Mauret-Cribellier 2008, p. 9
  15. ^ Mauret-Cribellier 2008, p. 88
  16. ^ a b Mauret-Cribellier 2008, p. 84

Bibliography

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  • Bouex, Paul (1931). "Les Canaux de Briare, d'Orléans et du Loing" [The Briare, Orleans, and Loing Canals]. Bulletin de l'association des naturalistes de la Folie du Loing (in French) (2): 61 et seq.
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