Bridge-street in Landerneau

In Landerneau, a town in Finistère, a unique structure known as a "bridge-street" spans about 70 meters. This unusual street is built directly on top of a bridge that was reconstructed in 1510, and it is flanked by houses where people currently live and run businesses.

Historic bridge and its reconstruction

The Rohan Bridge was rebuilt in 1510 by Jean II de Rohan, a local nobleman. He likely reconstructed the entire structure and added features such as a mill and possibly a prison. The viscount recouped the costs of the reconstruction by collecting tolls from those who crossed the bridge.

Origins of the bridge

The first known reference to the bridge dates back to 1336, when a hospital dedicated to Saint George was established at its head. This indicates the bridge likely existed in wooden form at that time. Jean II de Rohan's 1510 reconstruction probably replaced it with a more permanent structure.

Houses built on the bridge

By the 17th century, houses were constructed on the bridge and on wooden piles driven into the riverbed. One notable example is a bourgeois house built in 1639, whose foundations rest directly on the bed of the Elorn River, 129 years after the bridge's reconstruction.

Survival through time

The bridge and its structures have endured numerous challenges, including fires, tides, and floods from the Elorn River. According to the DRAC Bretagne, parts of the bridge from the early 16th century still remain, as do the houses built in the following centuries.

Classification as a historic monument

In January 2023, the entire Rohan Bridge was officially classified as a historic monument. This followed a partial collapse in August 2021, which highlighted the bridge's precarious foundation over a 500-year-old structure. A ground-penetrating radar survey was conducted in 2021 and 2022 to assess the condition of the bridge without damaging it.

Unique location and function

The bridge is situated at the edge of the Elorn River's tidal reach, where it separates fresh water from brackish water. This location has made it an integral part of Landerneau's evolving urban landscape. The DRAC Bretagne notes that the bridge is well-integrated into the city, with its foundations coexisting with the tides.

Public access and significance

The bridge is a public road in the city center, freely accessible to pedestrians and vehicles. It connects the quay of Leon to the north and the quay of Cornouaille to the south. Despite its historical significance, it functions like any other commercial street, with the exception that the Elorn River flows directly underneath it.