The Mississippi Valley Conservation Authority has issued a flood watch for the Mississippi River watershed, including Mississippi Mills, as rising temperatures and expected rainfall increase the risk of local flooding.
The watch, which remains in effect until April 21, 2026, warns that flooding is possible in specific areas near watercourses. The authority issued the update after conditions worsened since their initial outlooks in March and early April.
The heightened risk is due to a combination of saturated ground and a significant remaining snowpack in the upper watershed, which sits at approximately 150% of normal levels. Environment Canada forecasts that daytime temperatures will climb above 15°C this week, while total rainfall over the next two weeks is expected to reach 30 to 60 millimetres. These conditions limit the ability of the ground to absorb water, which will likely lead to increased runoff and higher water levels in the river and its tributaries.
In response to the potential for overland flooding, Southeast Public Health issued an advisory on April 14, 2026, regarding private well safety. Residents whose wells are affected by floodwaters are advised to boil their water for at least one minute at a rolling boil before consumption. Alternatively, residents should use a known safe water source until testing confirms the water is safe to drink.
The Municipality of Mississippi Mills and emergency services are encouraging landowners in flood-prone areas to prepare by clearing downspouts, checking that sump pumps are in working order, and securing any outdoor items that could be swept away by rising water.
