Natural Bridge Falls is a waterfall on Boulder River in Sweet Grass County, Montana, in the Northwestern Great Plains region, with a total height of about 105 feet. It lies about 18.9 miles southeast of Livingston and roughly 83.9 miles west of Billings as the crow flies.
At 105 feet it is on the modest side for Montana, where the typical waterfall with a recorded height stands around 250 feet; it ranks 85th of 123. The water comes down as a plunge, where the water drops vertically and loses contact with the rock face.
The Northwestern Great Plains are semi-arid rolling grassland with badlands and isolated buttes. Waterfalls are small and found on the few streams that cut through resistant rock.
There are 6 recorded waterfalls in Sweet Grass County. Falls Creek Falls, a 240-foot cascade waterfall, is about 10.5 miles away. Jewel Lake Falls, 320 feet high, is about 13.3 miles away. East Pine Creek Falls, an 80-foot tiered waterfall, is about 14.7 miles away.
Natural Bridge Falls is located at 45.5487° N, 110.2064° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this waterfall yet.