Tonto Natural Bridge, believed to be the largest travertine natural bridge in the world, is one of Arizona’s most striking geological formations. Standing 183 feet high and spanning a 400-foot-long tunnel that measures 150 feet at its widest point, this natural wonder was shaped over thousands of years by Pine Creek’s erosion of travertine deposits.
Our project aimed to enhance visitors’ experience with the creation of a new steel pedestrian bridge and viewing platform. Designed to blend seamlessly with the native landscape and geology, the bridge’s materiality and texture were carefully selected to complement its surroundings. The entrance to the bridge climbs against the canyon wall, reaching a natural cleft in the rock where the bridge spans over Pine Creek.
Given the remote location at the bottom of a canyon, the bridge structure was designed as a modular system, allowing for off-site fabrication and helicopter delivery of bridge sections. Anchored to the existing bedrock, the bridge and viewing platform provide immersive and safe access to this unique piece of Arizona’s natural heritage.