Sidedoor Cascade is an 80-foot waterfall on Tributary of West Fork Iron Spring Creek in Teton County, Wyoming, in the Middle Rockies region. It lies about 19.2 miles southeast of West Yellowstone and roughly 89.5 miles northeast of Idaho Falls as the crow flies.
At 80 feet it is taller than the typical Wyoming waterfall of about 60 feet, ranking 95th of 230 with a recorded height. By form it is a cascade, descending over a series of rock steps rather than in a single drop.
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. Fern Cascades, a 100-foot tiered waterfall, is under a mile away. Unfaithful Falls, a 300-foot tiered waterfall, is about 2.1 miles away. Cascade Falls, a 25-foot cascade waterfall, is about 2.1 miles away.
Sidedoor Cascade is located at 44.4463° N, 110.8578° 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 exact position has not yet been verified on aerial imagery, so treat the map pin as approximate. Details on trails, parking and access have not been documented for this waterfall yet.