Locks and railway

The opening of quarries above the Blavet in the 19th century is certainly connected to the ability to export production via towage and river navigation. In this small area are the three Polvern locks: the last and 28th lock on the river Blavet, les Gorêts and Grand Barrage, which can be seen through the trees or heard from the sound of their waterfalls.

The Forges de Kerglaw were also set up on the Lochrist side of the river in 1864, where they operated until 1966, also using river transport to export their production. In 1921, the two companies also used the little train from the ironworks, which provided a direct route to the station and to the national railway line that opened in 1860. Parallel to and above the towpath, you can still ride along its base, which has been converted into a path.