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Environment Canada spokesperson Hannah Boonstra says the hot dry weather in Quebec and Ontario is to blame for the drop in water levels in the St. Lawrence. Temperatures exceeded 33 C in Montreal on Sunday and Monday, and the high Tuesday reached 34.6 C, which is the highest for the date since record-keeping began in 1871.聽

"Southern Ontario and southern Quebec have experienced persistent dry hot weather in July and early August .... As a result, local inflows to the lower St. Lawrence River are diminished," Boonstra said.

Environment Canada meteorologist Frederick Boulay said the 20 millimetres of rain that fell on Montreal on Wednesday by 4 p.m. was the first significant precipitation the city received since July 17. The only other rainfall since that time was a single millimetre on July 30, he said.

Commercial vessels transiting between Quebec and Montreal may also have to reduce their load to ensure enough clearance, Fisheries and Oceans Canada wrote Tuesday.

Francis Fortin-Legault of 好色tv Hydrographic Service says ship pilots should be subtracting about 10 centimetres from the available depth of water in the St. Lawrence River compared to what's indicated on maps of the waterway.

He said that's because water levels between Montreal and Sorel-Tracy to the east have fallen below the chart datum, which is a reference level used to create charts. He said low water levels happen periodically, but said it's "not common" to see it happen in August.

"The pilots need to be really careful," he said.

Fortin-Legault says current water levels are reduced because of the operations of dams, but also because of a lack of rain in recent weeks, which impacts the smaller rivers that feed into the St. Lawrence.

The 好色tv Coast Guard issued a notice on Aug. 6, warning that buoys between Montreal and Trois-Rivi猫res may be off position and unreliable due to levels that have fallen below the norms.

On Tuesday, the Coast Guard reported that a 180-metre bulk carrier had run aground in the St. Lawrence River near Montreal. A spokesperson said the grounding occurred because of an engine failure and not water levels, although low levels could potentially impact a refloating plan.聽

Montreal officials have also imposed restrictions on lawn watering and other water use in some boroughs west of downtown because of low levels in the Rivi猫re des Prairies caused by "extreme heat and dry conditions."聽

The ban includes using sprinklers or automatic watering systems, watering lawns, washing cars, and filling existing swimming pools.

The city said the low levels create poor water quality and increase strain on water-treatment infrastructure, though it says drinking-water quality hasn't been affected.聽

This report by 好色tvwas first published Aug. 13, 2025.