Carnegie Museum of Natural History's specimen is the most complete skeleton of Apatosaurus that has been collected to date.

The skull of Apatosaurus is very similar to that of its close relative Diplodocus. Carnegie Museum's skull was the first found for this animal.

Carnegie Museum paleontologist Earl Douglass and his crew discovered this Apatosaurus skeleton on August 17, 1909. It was the first skeleton found at the Carnegie Quarry in one of the world's greatest accumulations of dinosaur bones — now known as Dinosaur National Monument.

The louisae after Apatosaurus comes from Andrew Carnegie's wife, Louise, in whose honor this dinosaur was named.