Shoal Marking Program
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 over 200 shoal markers each season between the eastern tip of Howe Island and Brockville in Canadian waters. TIA also contributes funding to Save the River for their management of an additional 100 markers from Cape Vincent to east of Alexandria Bay in US waters.
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. Accordingly, 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 in Canadian waters are white and orange with the word ROCK at the top of each marker. TIA’s markers include a decal with a marker number, contact info, and QR code that can be scanned with any smart device to report the discovery of a marker that has gone adrift from the shoal it was intended to mark.
If you find one of TIA’s shoal markers or if you notice a previously marked shoal that is missing a marker, please reach out to us with the location via the QR code or email us at markerwatchers@gmail.com.
Shoal markers in US waters, managed by Save the River, are white and orange with the word SHOAL at the top of each marker. If you find one of these shoal markers adrift or washed up on shore, please contact Save the River at (315) 686-2010.