Customer
VNF – Voies Navigable de France
(French Waterways Company)
Amount of work
3,8 M€ Place
Apremont Types of services
Design and work supervision.
Impact assessment
Water law file
Geotechnical and underwater investigations
The project involved rebuilding the Apremont “needle” dam on the Saône in the Haute-Saône district near Gray.
Built in 1860 and then modernized from 1982 to 1984, the Apremont dam constitutes a retaining reservoir to supply a diversion canal (navigable) whose entrance is located about 200m upstream from the dam.
This dam consists of a fixed part 55m long (spillway) and a mobile part (needle dam) 51m long with 4 passes of 12m. A hydroelectric plant is located on the right bank.
The purpose of the project is to:
- to replace the existing “needle” dam with a functional and automated structure (2 main passes of 21m – flap gate solution and “Obermeyer” type hydro-gates solution),
- realize the restoration of the spillway, the existing structures of the dam which will remain in place and the protection against scouring,
- to build a fish pass of the 10 successive basins type, adjoining the right-hand side,
- to build an eel pass and a canoe pass,
- the construction of a dual-use footbridge, public and technical, on the dam.
