The Natural Bridge is a neat interpretive area located 27 miles south of Big Timber in the scenic Boulder River Valley. Turbulent waters of the river acting against the limestone rock formations create this amazing Natural Bridge phenomenon. The area is a great site to enjoy with children or handicapped individuals, as there is an easy access asphalt trail connecting the various interpretive stations.

To access the Green Mountain Trail, cross the impressive wooden bridge spanning the Boulder River and follow the signs directing you along the trail. After the first half mile of roundabouting and up and down switchbacks, the trail climbs gradually across a long meadow. Follow the obvious rock cairns, as native grasses and wildflowers mask the trail. After a few miles of moderate climbing, the trail leads to a spectacular meadow complex at the saddle rollover between the East and Main Boulder Rivers.

Enjoy unmatched views here of both drainages. This is also a prime place to see wildlife—including elk, moose, deer and bear, especially in the early morning or late evening.

Remember to tread lightly and leave no trace.

Download our summary and map here, feel free to print! 

Don't have a printer at home? Come into the shop to pick up a copy of our map and trail description.

Here's how to get to the trailhead: