Pantherophis obsoletus obsoletus, aka black rat snake. It's actually the same species as our Texas rat snake, Pantherophis obsoletus lindheimeri. They differ morphologically region to region and are assigned to different subspecies, which is a concept I disagree with.
Rat snakes are excellent climbers and use small undulations to vertically move within tight spaces, such as cracks. When stretched across flat surfaces these undulations appear odd as depicted in your photo.

YUP....TEXAS RAT SNAKE...Good Snake, Do not kill this one, he is better than any mouse trap!!!! Make good pets around the barn. We have two that live in the barn at the lease. They are awesome mousers.

Texas has four venomous snakes that you should look up the see want they look like. The various types to rattle snakes, the water moccasin.(commonly confused with water snakes), the copperhead. (Commonly confused with the rat snakes) and our Pretty coral snake which looks nothing like the other pit vipers mentioned above, I hope experts will contribute if I missed any or add pictures. We also have a small spider called the Black Widow that can inflict some damage to you. and another spider call a "brown recluse" that can be very painful and leave ugly scars. Education makes the outdoors more enjoyable.
Hope I have helped more than hurt. Cool picture. Sorry so long.

Pope 1 strikes again- accurate stuff there.

Thanks for not doing the ignorant, redneck thing and killing it.

That is a HUGE rat snake snake..!Tree/wall climbing creature !!

bang ....a dead one

Chicken snake ? looks kind of like one to me .

It is correctly a Texas Rat Snake, commonly called a chicken snake. They are good to have around a rat/mouse infested barns but they are death on eggs if you raise chickens....

Venomous* poisonous is where you eat it and that's how the deadly substance gets into your body. Venomous is where the substance enters your body through a bite or puncture of the skin

Sorry that's just a pet peeve I have. That's not the dictionary definition, that's just what I've heard from animal experts

Where did you move from in Nebraska?

Jason (the picture taker) is my son and we moved here from rural Omaha area.

why would someone kill it? and why do some folks on here assume its a big snake? it could be one ft long for all we know. and the diameter of a #2 pencil.

It's no giant, but isn't small either. You can see grass in the background.

Please go to the library and check out a few books.