Most contractors don't have to worry about installing a catwalk high enough that an 8-ton Asian bull elephant on the ground can't reach a human handler walking across it, but that was one of the many challenges of building the Denver Zoo's new 10-acre, $50-million Toyota Elephant Passage exhibit.
The most complex issue faced by the project team—led by the Denver office of general contractor Kiewit Building Group—was creating one of the most sustainable animal habitats in the world. The team recently learned it had succeeded when the exhibit became the first large-animal complex in the U.S. to receive a LEED-Platinum rating.