Thirtymile Falls is a waterfall on Thirtymile Creek in Okanogan County, Washington, in the North Cascades region. It lies about 27.2 miles west of Tonasket and roughly 112.1 miles northeast of Marysville as the crow flies.
Its height has not been recorded in the source data.
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.
Okanogan County holds 76 recorded waterfalls, and several are close by. Waterfall 28 mi W of Tonasket, is about 1.3 miles away. Chewack Falls, is about 3.4 miles away. Meadow Creek Falls, is about 4.3 miles away.
Thirtymile Falls is located at 48.8097° N, 120.0154° 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.