The year-long dredging of a northwest Mississauga marsh in an effort to protect that part of the city from flooding is expected to be completed next month.
City of Mississauga Ward 10 Coun. Sue McFadden said this week in an update to the community that the dredging of Osprey Marsh “is expected to reach substantial completion by December, including the reopening of the Lisgar Meadowbrook Trail along the north edge of the marsh.”
The first-ever dredging of the man-made stormwater pond began in September/October 2025 and is being completed so it can better perform its important function, city officials said earlier.
The major project is part of the City of Mississauga’s stormwater management program, with specific emphasis on flood prevention in the Lisgar district, McFadden said.
“The marsh will be dredged by barge and the pond is not expected to be fully drained except for the very northeast cell where sediment will be deposited, dried and then trucked away,” McFadden explained in an update to constituents earlier this year. “This work follows the initial phase of dredging that took place last fall.”
(Image: Ward 10 Coun. Sue McFadden newsletter/City of Mississauga)
Osprey Marsh, located to the immediate northeast of Britannia Road West and Ninth Line, was built in the mid-1990s and is undergoing its first dredging.
Preparation work began in September 2025 and the dredging started in October 2025. Various sections of trails were also closed at that time to allow the work to proceed.
McFadden said earlier Osprey Marsh is a man-made stormwater pond (or series of smaller ponds) that regulates the flow of rainwater and snow melt from storm sewers and the Sixteen Mile Creek upstream.
“Over time, sediment can accumulate at the base of the pond, reducing its capacity,” the councillor explained at the outset of the work, adding this marks the first time Osprey Marsh has been dredged since it was built three decades ago.
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Aerial image shows location of Osprey Marsh and surrounding neighbourhoods.
Osprey Marsh, much like nearby Lake Wabukayne to the east, has also become home to numerous types of birds and other wildlife over the years.
One particular form of wildlife was causing some water flow problems at the marsh at the outset of the work in fall 2025.
At that time, city officials removed a number of beaver dams and beavers from in and around Sixteen Mile Creek and Osprey Marsh in the heart of the Lisgar community.
The critters, who were safely relocated, had built dams that were causing drainage problems near the creek and marsh. That subsequently led to the water flow issues, the city said earlier.
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