Like the other Redditors here have said, use common sense when traversing somebody else's land: Don't assume everyone knows about the rules of access regarding posted/non-posted property- most folks do not.

The following link is to a PDF prepared by the Vermont Society of Land Surveyors regarding Riparian Rights in the State of Vermont- This should contain all the information you are looking for about waterway rights-of-access and waterway boundaries.

Be careful, be respectful, and good luck :)

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https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiQ28ye-pr9AhVLmIkEHZD6D5EQFnoECBsQAQ&url=https%3A%2F%2Fwww.vsls.org%2Fwp-content%2Fuploads%2F2020%2F07%2FWater_Law_Water-Boundary_Seminar_Materials.pdf&usg=AOvVaw2vuD1BZzx6wNfNAGnfnCC1