The modernization and large-gauge adaptation project of the Ampsin-Neuville lock site has been awarded at the Belgian Construction Awards 2024. This project follows in the footsteps of previous developments at the Lanaye and Ivoz-Ramet sites. It has eliminated the last bottleneck for large-gauge vessels on the Meuse river between Namur and Antwerp, thereby enhancing the attractiveness of the Walloon navigable network.
Two new locks, one measuring 225 x 12.5 m (Vb) and the other 225 x 25 m (VIb), were built on the site of the existing locks (55 x 7.5 m and 136 x 16 m). The construction was phased to ensure uninterrupted navigation. The water drop at this point of the Meuse is 4.70 m. The project also included the adjustment of the upstream and downstream banks to meet nautical requirements, necessitating a 2-km rerouting of the N90 national road.
Key achievements
Integrated project management
The expertise of Greisch was fully mobilized. From design to coordination and execution, the project required multidisciplinary know-how. The complete electromechanical study was conducted by Tractebel Engineering.
River flow safety and navigation continuity
The construction was phased to account for periods of high and low water levels. The space occupation was a significant constraint incorporated into the study.
The works were meticulously organized to ensure uninterrupted vessel passage throughout the construction period, maintaining the flow of commercial river traffic.
An iconic infrastructure
The new corten steel pedestrian and cycle bridge, spanning 620 meters, connects the municipalities of Huy and Ampsin, crossing over the N90. To the right of the Meuse, the bridge spans the dam and has been reinforced to allow for the installation of temporary closure cofferdams for the dam’s spillways.
A positive ecological impact
The project includes the first fish pass of the artificial river type. This structure, the first of its kind in Wallonia, with a length of 700 m, promotes aquatic biodiversity by providing a suitable habitat for various species. The pass features diverse zones (pools, riffles, spawning grounds) with varying depths (from 30 cm to 2 m), flow intensities (calm zones, fast-flowing areas), and compositions (stone, vegetation, …). This diversity offers resting, breeding, and migration zones. The river is designed for salmonids (restoration of the Atlantic salmon life cycle) and other river species, both large (barbel, chub, …) and small (roach, bremen). Some areas also serve as ecological habitats for other species, such as dragonflies and amphibians.
Downstream, the Meuse bank has been softened and replanted to promote the redevelopment of aquatic biodiversity, including the creation of shallow water zones.
An ambitious and collaborative achievement
This project demonstrates our ability to tackle complex technical challenges while addressing the environmental and socio-economic needs of the region. We extend our gratitude to our partners and teams for their essential contributions to this success.
Key partners
- Owner: SOFICO and SPW Direction des Voies hydrauliques de Liège
- Engineering firms: Greisch and Tractebel
- Control office: Seco
- Architecture firm: Canevas
- Contractors: Duchêne Eiffage and Besix Unitec