Natural Bridge in Arco, Idaho
The Natural Bridge is high on the shoulder of King mountain in the Arco pass area of the Lost River Range is one of the most unusual scenic features in eastern Idaho. The huge limestone arch stands out from the high weather-eroded shoulder of the mountain. Its 80 foot high span frames the weathered spruce and high pinnacles of the summit of King moutain.
Located several miles off US 20-26 east of Arco it is only accessible to hikers. A county road leads from Arco to the Arco Pass road, then to a primitive road and turn off onto a primitive road leading to the foot of a narrow canyon known as Bridge Canyon. The trail up to the canyon follows along a now closed jeep trail. The trail is considered an easy to moderate walk. After you reach the view point the trail is not maintained and is a very steep ascent to the natural bridge. The final trail is not an easy climb and you will cross a talus slope which could be hazardous. As you round the final shoulder of the mountain the sudden view of the bridge is truly breathtaking. You may want to check with locals for conditions of road and trail before leaving the highway. Distance from highway to Natural Bridge is approximately 6.67 miles.