Ecological Continuities Restoration - Ecological Corridor on Existing Bridge

Grand-breuil Bridge, St Etienne Community
Area characterisation: 

Scale of the project: city

Scales impacts from this NBS action should be assessed: city, regional

Urban density in which the NBS is implemented: low (suburb at the limit with
rural areas, etc.)

  • Ecological corridor

The aim of this project is to connect two areas separated by a highway by creating a
wildlife passage on an existing bridge in order to reinforce an ecological corridor. This
structure is thought to allow cohabitation between fauna and motorists.

This project is also combined with another environmetal friendly solution:

  • Bio-sourced materials
Transferability of the result: 

Process enablers:
Knowledge drivers → Collaboration → Co creation
Governance drivers → Process efficiencies 


Process inhibitors:
... → ... → ...

Business cluster: Social
Business model: Adopt a stewardship role

Temporal perspective

Expected time for the NBS to become fully effective after its implementation: large (beyond 5 years)

Feddback: still well adapted

Expected life time of the intervention: around 25 years

Dates (for project delivered): 2017


Global (estimated) cost of the project: 50k€ - 200k€

Financing mechanism: cluster1 public financing

40% ERDF / 40% Rhône-Alpes region / 20% self-financing

NBS classification 
  • Strategies actions
  • Urban planning strategies
  • Ensure continuity with ecological network

Alice Duquesnoy (
Olivier Damas
Plante & Cité (
Maison du Végétal, 26 Rue Jean Dixmeras, 49000 Angers

Further information

Nature4Cities ( aims to develop a knowledge diffusion around Nature-Based Solution (NBS) and a decision support platform through new collaborative models.

This project is part of the Nature4Cities's pioneer case studies database, it will feed the observatory, NBS pre-selection and replication tools, gathered into the Geocluster4NBS.

This project was chosen as a pioneer case study for the following reasons: the aim of this project is create a wildlife passage on a existing bridge and therefore allows the cohabitation of fauna and motorists.

Nature4Cities project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 730468.

Urban challenges
Biodiversity and urban space: 
Urban space development and regeneration
Urban planning and governance: 
Urban planning and form
Key Performance Indicators: