Forgotten Falls is a 20-foot waterfall on Fall River in Teton County, Wyoming, in the Middle Rockies region. It lies about 31.7 miles east of Ashton and roughly 76.4 miles northeast of Idaho Falls as the crow flies.
At 20 feet it is on the modest side for Wyoming, where the typical waterfall with a recorded height stands around 60 feet; it ranks 182nd of 230. By form it is a block waterfall, wider than it is tall, spilling over a broad ledge.
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. Fall River carries 11 recorded waterfalls; the biggest of them reaches 140 feet.
Teton County holds 121 recorded waterfalls, and several are close by. Mist Cascade, a 40-foot cascade waterfall, is under a mile away. Upper Mist Cascade, a 10-foot block waterfall, is under a mile away. Humpback Cascade, a 15-foot cascade waterfall, is about 1.6 miles away.
Forgotten Falls is located at 44.1380° N, 110.8159° 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.