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can you describe the snake?
there's only a few snakes in the area that will be that large.
did the snake have a pattern? What colors made up the pattern? What color was the belly?
Was the head triangular or was it more of a coffin shape?
How thick was the snake?
My first guesses would be either a very large watersnake (Diamond back or Yellowbelly, but not sure if those are in your area)
Also, ratsnakes can easily reach 5.5 feet. Texas Rat, Gray Rat, Yellow Rat, Black Rat, etc.
Try reposting the pic or if you have it uploaded to photobucket.com, you can embed it or just give us the link.
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1.0.0 Great Plains Ratsnake
1.0.0 Corn, Lavender Aztec het for Amel
0.1.0 Black Ratsnake
0.0.1 Texas Rat (tame)
1.0.0 Broad Banded Water Snake, Hypo
1.0.0 Black Bassador Retriever
2.1.0 Godchildren, 1 Evil, 2 possible hets