In Illinois that would be a common water snake...and boy oh boy are they common. I can't tell you the number of 'copperheads' and 'water moccasins' people have killed that are nothing but a poor common water snake, completely harmless.
Now given that shot is from Texas I'll defer to folks further south for an ID.
God ain't that the truth I think people in illinois think there's only two kinds of snakes water moccasin and copperhead and of course the cotton mouth to which they like to call both snakes? I've killed a few water snakes in my pond mainly because they get to be about as big as a coke can and longer than my kids and I like eating my own bullfrog lol..
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