Erosion and shoreline stability

Navigation safety and shoreline stability are important for land users, as they directly affect travel and the use of La Grande Rivière. Bank, shore and channel conditions can be affected by changes in water levels and flow.

To better understand the current situation and possible impacts, a survey was carried out in summer 2025 with Eeyou land users. Observations were made on selected segments downstream of La Grande-1, Robert-Bourassa (La Grande-2), La Grande-3 and La Grande-4 generating stations, extending to the river mouth. Simulation studies were also conducted to examine possible changes in water levels and flow that could result from the potential La Grande capacity upgrades. All observations and data collected are currently being analyzed to identify and assess impacts on riverbanks, shorelines and delta dynamics.

Final results will be reviewed at the Technical Table and shared with the three concerned communities in Fall 2026. If needed, results from these studies will help support measures to reduce and mitigate impacts.

Find out more in the Fact Sheet.