Upper Foss River Falls is a waterfall on West Fork Foss Creek in King County, Washington, in the North Cascades region, with a total height of about 337 feet. It lies about 21.9 miles northeast of Tanner and roughly 35.8 miles east of Sammamish as the crow flies.
At 337 feet it stands in the tallest quarter of Washington’s 941 waterfalls with a recorded height, ranking 110th; the typical Washington waterfall is about 82 feet. The tallest single drop is 80 feet. The water comes down as a tiered waterfall, falling in several distinct steps one after another, combined with a cascade character. It falls in 6 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.
There are 236 recorded waterfalls in King County. Lower Foss River Falls, a 251-foot tiered horsetail waterfall, is under a mile away. Otter Lake Falls, a 159-foot tiered cascade waterfall, is under a mile away. Middle Copper Falls, a 72-foot tiered cascade waterfall, is about 1 miles away.
Upper Foss River Falls is located at 47.5982° N, 121.3145° 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.