Construction on the Plougastel Bridge started in 1926 and was completed on 9 October 1930.

Part of it was destroyed by the German army in 1944, and shortly after was closed for repair.

The arches are composed of concrete and have a total length of around 888m.

The three major spans are 188 m[1] but sometimes said to be 186 m.[2] The engineer who constructed the bridge was named Eugène Freyssinet, and the president of the committee managing the project was Albert Louppe, an explosives engineer who pursued a parallel career in politics, becoming the Senator for Finistère in 1921.

Louppe died in 1927, one year after work on constructing the bridge finally began.