Barrage de la Roche

The Barrage de la Roche is located between Le Vigeant and Millac.

It was built and put into service in 1921 by the Société des forces Motrices de la Vienne.

In 1946, its operation was taken over by EDF.

The dam, of the rectilinear weight type, was built astride an island located in the center of the river.

Its crest length is 203 m, including the 58 m plant (right bank).

The flood discharge equipment is located on the left bank. It includes surface gates, automatic gates and bottom gates.

The power plant is equipped with 4 generating units: 3 propeller units and 1 Kaplan turbine, which allows for a finer adjustment of flows during low water periods.

It is a facility with a low storage capacity. It retains a little more than 4 million m3 of water, for a height of less than 20 m.