Rotten Log Falls is a waterfall on Little Kachess River in Kittitas County, Washington, in the North Cascades region, with a total height of about 60 feet. It lies about 21 miles northwest of Cle Elum and roughly 42.3 miles east of Sammamish as the crow flies.
At 60 feet it is on the modest side for Washington, where the typical waterfall with a recorded height stands around 82 feet; it ranks 555th of 941. The water comes down as a horsetail, where the water keeps some contact with the bedrock as it falls.
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. Little Kachess River carries 2 recorded waterfalls, and Rotten Log Falls is the tallest of them.
There are 86 recorded waterfalls in Kittitas County. Little Kachess Falls, is about 1.4 miles away. No Name Falls, is about 1.6 miles away. Island Mountain Falls, is about 2.4 miles away.
Rotten Log Falls is located at 47.4240° N, 121.2338° 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.