La Gabelle generating station and its spillway

La Gabelle generating station and its spillway are located on the Rivière Saint-Maurice, some 24 km north of Trois-Rivières in the Mauricie region. This facility is the last of Hydro-Québec’s 11 generating stations on this river.

Project description

The project consists of replacing the lifting mechanism of the spillway at La Gabelle generation station. The trolley hoist currently used was commissioned in 1924. After 92 years of service, it has reached the end of its useful life.

Hydro-Québec archives [1923–1925] – The gate lifting mechanism that will be replaced in 2016–2017 was installed when the generating station was built.

To ensure the safety of the public and workers, as well as the reliability of its facility, Hydro-Québec must:

  • replace the trolley hoist with six independent rope hoist mechanisms
  • replace and raise the lifting structure
  • add remote control of gates
  • add an emergency generator
  • add a control building on the spillway
  • build a monorail for handling stoplogs
  • build a walkway upstream

In addition, in 2018–2019, Hydro-Québec will have to:

  • redo the insulation of heated gates VE1 and VE2


The project will be carried out between November 2015 and December 2017. Preparatory work will last until June 2016. After that, the main work for replacing the lifting mechanism will start, to be completed in December 2017.

Cranes like these will be used for the main construction work starting in June 2016.