Have any of you been watching the construction of the new South Layton Interchange? It's one of the stranger bridge construction techniques that UDOT has employed lately:
• Video Link
They basically placed huge piles of dirt on each side of the freeway, added steel columns to form a buttress-like temporary structure and build half of the bridge on each side. Then, they removed the excess dirt at each abutment, jacked the bridges down (shown in the video) and over the past few days, have begun the process of sliding the bridge out over the traffic lanes to eventually sit on the support in the median. Its been quite the process. This weekend, they are closing the freeway to finish sliding the bridge off of the abutment and into place.