Agate Bridge, Petrified Forest National Park Travel Guide

Agate Bridge, located in Petrified Forest National Park, is a remarkable testament to time and geological processes. This 110-foot petrified log stretches across a 40-foot wide gully, creating a natural bridge. The bridge is about 10 miles from the park's south entrance and 18 miles from the north entrance.Originally called Natural Bridge, it became a popular attraction, with visitors posing on top of it. However, concerns about its stability led to the construction of masonry pillars in 1911 to support the log. These were later replaced by a concrete span in 1917. Today, the National Park Service's philosophy is to allow natural forces to shape the landscape, so no further interventions are planned, even though the bridge is expected to eventually collapse.Agate Bridge is a reminder of the forces that have shaped the region over millions of years. Rainwater gradually eroded the softer sandstone beneath the petrified log, forming the gully. The petrified wood, composed of dense silica, proved more resistant to erosion, resulting in the natural bridge. While visitors can no longer walk on the bridge, there are viewpoints and a short trail offering excellent perspectives of this unique geological feature.