<div dir="auto">If a body of water ( take for example Lake Tahoe ) has a federal presence located on then it also comes under U.S. Coast Guard jurisdiction. </div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Feb 21, 2026, 9:31 AM Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Alec,<br>
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According to AI, any navigable water is subject to USCG jurisdiction. Navigable means "It must function (or be capable of functioning) as part of a commercial transportation system between states or with foreign nations."<br>
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So that would include all coastal waters, the Intra-Coastal waterway on the east coast, and large lakes that span multiple states such as the Great Lakes, Lake Mead, Lake Tahoe, etc. Small local lakes situated entirely within a single state is typically not "navigable" or under Coast Guard control.<br>
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Jon<br>
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On Saturday, February 21, 2026 at 09:17:23 AM EST, Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote: <br>
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Jon, that's super useful, thanks. I have a very basic question. D'you know the criteria for when bodies of water in the US are subject to CG jurisdiction? <br>
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