Shoal Marking Program

TIA’s shoal marking in the news!  Click here to read more (note:  the first photo in the article is a video link)

Founded in 1934, TIA’s most recognizable program is the placement, seasonal maintenance and removal of nearly 200 shoal markers each season between the eastern tip of Howe Island and Brockville. We also supply the funding for an additional 100 markers that are placed by Save The River each season.

The primary objective of our shoal marking program is to heighten boater’s awareness of the importance of careful navigation throughout the Thousand Islands region. Our shoal marking program is not intended, nor should it be used for navigational purposes at any time, and boaters should be aware that only a small percentage of shoals are marked each season.

TIA strongly encourages all boaters to use navigation charts when on the river and to be aware that for a variety reasons, shoal markers do break loose from time to time.  As such, previously marked shoals may become unmarked for an extended period of time.  Due to the unpredictability of this occurring,  the Thousand Islands Association disclaims any liability for the absence of any of our shoal markers for any reason.


Found or Missing Shoal Marker Reporting

TIA shoal markers are white and orange with the word ROCK at the top of each marker. Markers should include a TIA decal with contact info and a QR code that can be scanned with any smart device.

If you find one of our shoal markers or if you notice a previously marked shoal that is missing a marker, please reach out to us with the location via email at

If you find a shoal marker in St. Lawrence River American Waters, please contact Save the River at (315) 686-2010.

Why Your Membership Matters

TIA is the only organization placing shoal markers for the River Community - this is an essential service. Our mission of river safety is to heighten boater’s awareness of some dangerous shoals to avoid . TIA strongly encourages all boaters to use navigation charts when navigating the St. Lawrence River. Please be a TIA supporter, we rely on membership dues & donations to be sustainable.

Connect with TIA on social media and be part of our river community.