Lost Creek Falls is a 200-foot waterfall on Lost Creek in King County, Washington, in the Cascades region. It lies about 2.4 miles south of Wilderness Rim and roughly 21.8 miles southeast of Sammamish as the crow flies.
At 200 feet it stands in the tallest quarter of Washington’s 941 waterfalls with a recorded height, ranking 199th; the typical Washington waterfall is about 82 feet.
The Cascades are a high volcanic range of snow-capped peaks, deep glacial valleys and dense conifer forest of Douglas fir, western hemlock and true firs, with abundant rain and snow on the western slopes. Basalt cliffs and lava flows give the region one of the highest concentrations of waterfalls in the country. Lost Creek carries 4 recorded waterfalls, and Lost Creek Falls is the tallest of them.
King County holds 236 recorded waterfalls, and several are close by. Upper Cedar Falls, a tiered horsetail waterfall, is under a mile away. Middle Cedar Falls, 15 feet high, is under a mile away. Lower Cedar Falls, 80 feet high, is under a mile away.
Lost Creek Falls is located at 47.4123° N, 121.7585° 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.