Alta Basin Falls is a 115-foot waterfall in Kittitas County, Washington, in the North Cascades region. It lies about 20.4 miles east of Tanner and roughly 38.7 miles southeast of Sammamish as the crow flies.
At 115 feet it is taller than the typical Washington waterfall of about 82 feet, ranking 364th of 941 with a recorded height. The tallest single drop is 78 feet. By form it is a tiered waterfall, falling in several distinct steps one after another, combined with a cascade character. It falls in 2 drops.
The North Cascades are a wilderness of jagged peaks, glaciers and deep, forested valleys of western hemlock, silver fir and Douglas fir, with some of the heaviest snowfall in the country. Meltwater from glaciers and snowfields pours down thousands of feet of cliffs in countless cascades and horsetail falls.
Kittitas County holds 86 recorded waterfalls, and several are close by. Hibox Falls, is under a mile away. Switchback Cascades, a 118-foot cascade waterfall, is under a mile away. Headwall Falls, is under a mile away.
Alta Basin Falls is located at 47.4239° N, 121.3156° 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 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.