Tendering Authority - Département de la Haute-Savoie
Annecy, France

Procedure Type - Open procedure.

The contract is divided into 2 lots.

Scope of Works

The contract concerns the maintenance of installations and civil engineering structures at the following locations:

• Montets Tunnel (Saint-Gervais – Vallorcine railway line), Vallorcine/Chamonix;
• Pendant Avalanche Gallery, RD 1506 (km 8+273 – 8+724), Chamonix-Mont-Blanc;
• Sommand Gallery, RD 308 (km 9+600 – 9+900), Mieussy.

The works include routine and preventive maintenance of electromechanical systems, structural elements, drainage, and safety installations associated with tunnel and avalanche protection infrastructure.

Tunnel Details

1. Montets Tunnel

• Location: Vallorcine / Chamonix
• Line: Saint-Gervais – Vallorcine railway
• Length: 1,882 m
• Type: Bi-modal tunnel (rail and road traffic)

The Montets Tunnel operates as a dual-use facility, carrying railway services and, during winter closures of the Col des Montets pass, controlled road traffic.

Maintenance elements include:

• Automation and signalling systems managing alternating train and vehicle traffic;
• Ventilation systems for smoke extraction;
• Fire detection installations;
• Safety niches and associated equipment.

Due to its strategic role in maintaining winter access to the Chamonix valley, maintenance interventions are typically scheduled during off-peak periods.

2. Pendant Avalanche Gallery

• Location: RD 1506, km 8+273 – 8+724, Chamonix-Mont-Blanc
• Type: Avalanche and rockfall protection gallery

The structure provides protective cover to the departmental road against snow slides and rockfalls.

Maintenance elements include:

• Structural reinforcement works;
• Waterproofing measures;
• Inspection and repair of concrete arches;
• Cleaning and rehabilitation of drainage systems;
• Upgrading or replacement of internal lighting systems.

3. Sommand Gallery

• Location: RD 308, km 9+600 – 9+900, Mieussy
• Type: Avalanche and rockfall protection gallery

This gallery provides access to the Sommand ski area and is located in a mountainous environment subject to erosion and snow accumulation.

Maintenance elements include:

• Inspection and maintenance of rockfall protection systems (nets and anchors);
• Repair of roof slab and apron sections to ensure resistance to falling debris;
• Civil engineering maintenance of structural components.

Traffic management measures, including alternating traffic arrangements or temporary closures, may be required during maintenance operations.

Contract Value

Estimated contract value: EUR 2.04 million (excluding VAT).

Duration

Contract duration: 12 months.

Deadline

23 March 2026

Contact Details

Département de la Haute-Savoie
Attn: Martial Saddier
Annecy, France

Tel: +33 0450332132
Email: dcpfour-serv@hautesavoie.fr

Reference: 2026A0056
Official Journal of the European Union: OJ S 036 – Notice 121916-2026

Further information:
https://ted.europa.eu/en/notice/-/detail/121916-2026. 09/26.