Unfaithful Falls is a 300-foot waterfall on Tributary of Little Firehole River in Teton County, Wyoming, in the Middle Rockies region. It lies about 17.3 miles southeast of West Yellowstone and roughly 90.5 miles northeast of Idaho Falls as the crow flies.
At 300 feet it stands in the tallest quarter of Wyoming’s 230 waterfalls with a recorded height, ranking 21st; the typical Wyoming waterfall is about 60 feet. The tallest single drop is 100 feet. By form it is a tiered waterfall, falling in several distinct steps one after another.
The Middle Rockies are high, glaciated mountain ranges with alpine peaks, subalpine fir and spruce forest, lodgepole pine and grassy intermontane valleys. Snowmelt streams cascade down glacial valleys and canyon walls.
Teton County holds 121 recorded waterfalls, and several are close by. Mystic Falls, a 70-foot tiered waterfall, is under a mile away. Cascade Falls, a 25-foot cascade waterfall, is about 1.3 miles away. Sidedoor Cascade, an 80-foot cascade waterfall, is about 2.1 miles away.
Unfaithful Falls is located at 44.4745° N, 110.8712° 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 position was verified on aerial imagery. Details on trails, parking and access have not been documented for this waterfall yet.