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.

Dale

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"When tempted to fight fire with fire, remember that the Fire Department usually uses water." - anonymous