Upper Weeks Falls is a 25-foot waterfall on South Fork Snoqualmie River in King County, Washington, in the North Cascades region. It lies about 6.8 miles southeast of Riverbend and roughly 26.2 miles southeast of Sammamish as the crow flies.
At 25 feet it is on the modest side for Washington, where the typical waterfall with a recorded height stands around 82 feet; it ranks 811th of 941.
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. South Fork Snoqualmie River carries 7 recorded waterfalls; the biggest of them reaches 230 feet.
King County holds 236 recorded waterfalls, and several are close by. Dirty Harrys Falls, is under a mile away. Weeks Falls, a 77-foot segmented cascade waterfall, is about 1.4 miles away. Hall Creek Falls, a 103-foot slide horsetail waterfall, is about 1.9 miles away.
Upper Weeks Falls is located at 47.4259° N, 121.6183° 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 position was verified on aerial imagery. Details on trails, parking and access have not been documented for this waterfall yet.