I think you all are way too calm about this herpetology thing. Here, let me fix this for you.
I've never seen any venomous snakes in the wild.
I've seen plenty of northern water snakes in and around the rivers in the mid-Atlantic, and once when on Big Island in the middle of Lobster Lake, we happened upon a bunch of just-hatched garter snakes or ribbon snakes. And then there was this fellow in Sorrel Ridge campsite on the Potomac in Western Maryland climbing straight up a tree (and over one of the lines securing our tarp. Black rat snakes are equally at home up a tree as on the ground. This one, probably about 3.5-4 feet when stretched out, is a medium sized one. Five and six footers are pretty common.
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I've heard several stories about snakes "falling" out of trees into canoes. It seems odd to me. I have a hard time imagining snakes are hitching rides in canoes on purpose......