My Dad was an engineer who was working for Ken. R. White, the designer of this bridge (and the freeway between Yakima and Ellensburg). I can remember going out to the bridge site when it was under constuction with my cub scout group. It is a beautiful bridge, but the real story is in building the freeway. Because of FHWA requirements, the steepness of the grades were limited and there was a really significant amount of dirt that had to be moved to build the freeway.