Conditions
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Main Duck Island sits in eastern Lake Ontario, within the Thousand Islands region near the mouth of the St. Lawrence River, roughly midway between the Prince Edward County shoreline and the New York state border. The waters around the island are known for shipwrecks tied to the lake's long history of shipping traffic, and dive sites in this area are typically reached by boat out of nearby Ontario ports.
AI overviewDurable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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