Paleoecological analysis indicates that "Sauroposeidon" lived on the shores of the Gulf of Mexico, in a river delta. Extrapolations based on the more completely known "Brachiosaurus" indicate that the head of "Sauroposeidon" could reach in height with its neck extended, which would make it the tallest known dinosaur. With an estimated length of and a mass of , it also ranks among the longest and heaviest. However, this animal may not be as closely related to "Brachiosaurus" as previously thought, so these estimates may be inaccurate.