The marsh is a baymouth bar, meaning a sandbar separates the wetland from the open waters of Lake Ontario.
It is designated as an Environmentally Significant Area due to its rare ecological characteristics.
The area serves as an essential staging ground for migratory waterfowl during spring and fall seasons.
The park contains a mix of deciduous forest species including sugar maple, white ash, and American beech.
Rattray Marsh is subject to natural fluctuations in water levels, which dictate the health and composition of the marsh flora.
Archaeological evidence indicates Indigenous presence in the area dating back hundreds of years.
Rattray Marsh Conservation Area is the last remaining baymouth bar coastal wetland on the north shore of Lake Ontario. The park features a network of elevated boardwalks traversing sensitive marshland ecosystems that connect to the waterfront trail. It serves as a vital stopover for migratory birds and supports diverse wildlife populations including white-tailed deer and various amphibian species. The landscape is primarily composed of forest, meadow, and marsh habitats maintained by Credit Valley Conservation. Visitors navigate the area via a combination of gravel paths and wooden walkways designed to minimize human impact on the ecosystem. The site is a significant remnant of the natural heritage of the Mississauga lakeshore region.
The central boardwalk overlooking the open water of the marsh during sunrise.
Bring binoculars as the elevated boardwalks offer excellent vantage points for birdwatching in the interior of the marsh.
Stay strictly on designated boardwalks and paths to protect the fragile wetland soil and plant life.
Check the Credit Valley Conservation website for potential trail closures following heavy rain or spring thaw events.
Do not attempt to walk off-trail into the marsh reeds, as the ground is unstable and the ecosystem is highly protected.
No cycling or pets allowed on the wooden boardwalks; keep noise levels low to avoid disturbing wildlife; carry out all trash.
