At low water, the river flowed under a natural rock bridge, but in July 1988, the bridge that gave the area its name collapsed. The park also serves as a wilderness trailhead and has good trout fishing. It is 40 acres in size and is at 5000 feet elevation. There are interpretive plaques explaining the geologic process.
Some trails are steep so good walking shoes are recommended.
Great place for photography. The park is 27 miles south of Big Timber on Secondary 298.