Highest point on I-90

During the drive from Syracuse NY to the Boston area I climed up to the highest point on I-90 between there and somewhere in South Dakota. I wrote down Ocama but that isn't a town in SD. Anyway that point was approximately 1730 feet in elevation. It was right after the Appalachain trail crossed the Mass Pike. From that point in MA you would have to drive at least 1500 miles west to reattain the same elevation.