— a fallen tree the desert turned to stone.
“A petrified log a hundred and ten feet long, stretched across a shallow wash on the high Painted Desert. The wood went to stone two hundred million years ago and has been bridging this gully ever since. A concrete beam was slid under it in 1917, the year someone decided the desert had carried it long enough. Coaches pass through quietly.
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Agate Bridge sits in the southern half of Petrified Forest National Park, in Navajo County, Arizona, on a stretch of high Painted Desert at roughly 5,400 feet. The log itself is a Triassic conifer, Araucarioxylon arizonicum, embedded in the Chinle Formation laid down about 225 million years ago. The park preserves one of the largest concentrations of petrified wood on earth across 230 square miles. The bridge is reached on the 28-mile park road between Interstate 40 and U.S. 180.
The log is silicified wood, quartz and agate with traces of iron and manganese that color it red, yellow, and white. It measures about 110 feet long and spans a gully roughly 40 feet wide. In 1911 a stone pillar was set beneath it to keep it from collapsing; in 1917 the National Park Service replaced that with the reinforced concrete beam still visible today. The Park Service no longer intervenes that way. The policy now is to let stone weather as stone weathers.
The park is open year round, generally 8 to 5 in winter and 7 to 7 in summer; entrance is $25 per vehicle. Agate Bridge is one of the marked pullouts on the main park road, signed and easy to find. A short paved path leads from the lot to the overlook fence, perhaps two hundred feet. Climbing or walking on petrified wood is prohibited throughout the park, and removing even a fragment carries a federal fine.