So, I was hiking through Bentsen State Park (in Texas on Rio Grande) this weekend and ran across what I first thought was a branch lying across the path. It was silvery grey with a slight green tint. To my surprise as I came closer it slid off of the path–it was a snake, but WHAT a snake!
The snake had no discernible pattern and I never saw its head. Since I never saw its front part, all I can tell you was it was 4 feet or over, but the shocker was it was big around–about as big as my forearm. It didn’t really taper at the end. Although this park is on the Rio Grande, I was not that close to the river–about .5 miles. I’ve seen Cotton Mouths (water moccasins) and this really did not look like one as it didn’t have even a faint pattern and just seemed too long and away from the river.
They have a moderately heavy body and a female might not taper much towards the end. Still that’s pretty thick. I’d guess a rattlesnake would be more likely, but I would assume you would have noticed a rattle and most of those are patterned as well, though you do get oddballs occasionally ( and rattles can be lost ).
You might check out the full list, taken from the one above and see if you can narrow it down: