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Onyx Bridge: A Fallen Giant of Petrified Forest

Hike to the remains of a once-iconic petrified log bridge in Petrified Forest National Park, a testament to time and geological forces.

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Onyx Bridge was once a dramatic example of a petrified tree spanning a gully in Petrified Forest National Park. Though it has collapsed due to natural erosion, the site remains a testament to the area's ancient history and the forces that shaped this unique landscape. Visitors can hike to the former bridge site and witness the remnants of this once-iconic geological feature.

A brief summary to Onyx Bridge

Local tips

  • Bring plenty of water and sun protection, as the desert environment can be harsh, especially during the summer months.
  • Download an offline map or obtain a paper map from the visitor center, as the trail to Onyx Bridge can be difficult to follow in some areas.
  • Be prepared for a moderate hike with some elevation change, and wear sturdy hiking shoes.
  • Check with park rangers for current trail conditions and any potential hazards before embarking on the hike.
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Getting There

  • Walking

    The Onyx Bridge Trail is accessed from the Painted Desert Inn area. From I-40, take Exit 311 for Petrified Forest National Park. Follow the signs for Petrified Forest and enter the park. Drive approximately 2.1 miles to the parking area for Kachina Point and the Painted Desert Inn. The trailhead is located near the Painted Desert Inn. The hike to Onyx Bridge is about 4 miles round trip and is considered moderately difficult. Be sure to bring a map and plenty of water.

  • Car

    To reach the Onyx Bridge trailhead by car, enter Petrified Forest National Park via I-40, taking exit 311. Drive north into the park. Continue for approximately 2.1 miles to the Kachina Point and Painted Desert Inn parking area. Parking is free. From the parking area, follow the walking directions to the Onyx Bridge Trail.

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Discover more about Onyx Bridge

Onyx Bridge, located within Petrified Forest National Park, was a remarkable example of a petrified log bridge formed over millions of years. This Triassic-era conifer, estimated to be around 210 million years old, spanned a wash, creating a natural bridge-like formation. The 'bridge' was created in reverse; the tree was in place before the gully formed, and centuries of erosion gradually washed away the earth beneath it. Unfortunately, in recent years, Onyx Bridge succumbed to the forces of gravity and collapsed. While it no longer resembles a bridge, the site remains a point of interest for hikers and nature enthusiasts. The area offers a chance to witness the power of geological processes and to contemplate the immense timescales involved in the creation of the Petrified Forest. The surrounding landscape, characterized by colorful badlands and scattered petrified wood, adds to the allure of the hike. The hike to Onyx Bridge provides an opportunity to explore the Black Forest Bed of the Chinle Formation, the geological layer from which the petrified wood originates. This area is rich in fossilized remains, offering glimpses into a prehistoric world where towering trees once thrived. Although the bridge itself is gone, the fragments of the ancient tree and the surrounding petrified wood create a surreal and captivating experience.

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